Университет по Архитектура, Строителство и Геодезия (УАСГ)

1 Физика за студентите от специалност ССС

2 Физика за студентите от ГФ

висше: СУ"Св.Кл.Охридски", Физ.ф-тет, специалност Физика на твърдото тяло, 1994г.

д-р "Електрични, магнитни и оптични свойства на кондензираната материя", 1999г.

руски, английски

В областта на физиката на твърдото тяло - сегнетоелектрици, магнитно-подредени системи, мулти фероици, тънки филми, наночастици.

В областта на теория на твърдото тяло.

гл. асистент, д-р 2012-2014

доцент, д-р 2014-2020

професор, д-р 2020-до сега

сегнетоелектрици, магнитно-подредени системи, мулти фероици, тънки филми, наночастици.

Общ списък на научните публикации, участие в конференции, участие в научни проекти, издадени учебници и монографии на доц. д-р Ангел Тодоров Апостолов към 19.12.2021 г
хронологично

Научни публикации:
1. J. M. Wesselinowa and A. T. Apostolov, Self-consistent theory of spin-phonon interactions in ferromagnetic semiconductors, J. Phys.: Cond. Matter 5, 3555-3564 (1993).
2. J. M. Wesselinowa, A. T. Apostolov and A. Filipova, Anharmonic effects in potassiumdihydrogen-phosphate-type ferroelectrics ferroelectrics, Phys. Rev. B 50, 5899- 5904 (1994).
3. J. M. Wesselinowa, A. T. Apostolov and M. S. Marinov, The Green’s function technique for spin-phonon interactions in squaric acid The Green’s function technique of phase transitions in squaric acid, J. Phys.: Cond. Matter 7, 1701-1709 (1995).
4. J. M. Wesselinowa and A. T. Apostolov, Conduction-Electron Magnetization of Ferromagnetic Semiconductors, phys. stat. sol. (b) 189, K21-K26 (1995).
5. J. M. Wesselinowa, A. T. Apostolov and A. Filipova, Phonon Energy Renormalization in KDP-Type Ferroelectrics, phys. stat. sol. (b) 197, 509-516 (1996).
6. J. M. Wesselinowa and A. T. Apostolov, Anharmonic effects in ferromagnetic semiconductors, J. Phys.: Cond. Matter 8, 473-488 (1996).
7. J. M. Wesselinowa and A. T. Apostolov, Dynamical structure factor for the s-f model with spin-phonon interaction, Int. J. Mod. Phys. B 10, 2797-2809 (1996).
8. J. M. Wesselinowa and A. T. Apostolov, On the origin of the central peak in Hydrogen-Bonded ferroelectrics, Solid State Commun. 101, 343-346 (1997).
9. J. M. Wesselinowa and A. T. Apostolov, Anharmonic effects in LHP- and LDP-type ferroelecttrics, investigated with the Green’s function technique, Ferroelectrics 200, 297-318 (1997).
10. J. M. Wesselinowa and A. T. Apostolov, A Microscopic Theory for the Central Peak in Hydrogen-Bonded Ferroelectrics, phys. stat. sol. (b) 201, 529-550 (1997).
11. J. M. Wesselinowa and A. T. Apostolov, Dynamical Critical Exponents of the Ising Model with a Transverse Field, phys. stat. sol. (b) 201, R1-R2 (1997).
12. J. M. Wesselinowa and A. T. Apostolov, Lattice Modes in PbHPO4 and H2C4O4, phys. stat. sol. (b) 203, 53-58 (1997).
13. J. M. Wesselinowa and A. T. Apostolov, About the Intrinsic Mechanisms of the Central Peak Phenomenon in Hydrogen-Bonded Ferroelectrics, phys. stat. sol. (b) 204, 835-844 (1997).
14. I. Apostolova, A. Apostolov and J. Wesselinowa, Theoretical study of the phonon spectra of multiferroic BiFeO3 nanoparticles, J. Phys.: Condens. Matter 21, 036002 (2009).
15. J. M. Wesselinowa and A. T. Apostolov, A possibility to obtain room temperature ferromagnetism by transition metal doping of ZnO nanoparticles, J. Appl. Phys. 107, 053917 (2010).
16. J. M. Wesselinowa and A. T. Apostolov, Theory of phonon properties at pure and ion-doped ZnO nanoparticles, J. Appl. Phys. 108, 044316 (2010).
17. J. M. Wesselinowa and A. T. Apostolov, Origin of the acoustic phonon frequency shifts in semiconducting nanoparticles, Phys. Lett. A 374, 4455-4457 (2010).
18. J. M. Wesselinowa and A. T. Apostolov, Spin-phonon interaction effects in pure and ion- doped NiO nanoparticles, phys. stat. sol. (b) 248, 755-759 (2011).
19. J. M. Wesselinowa, A. T. Apostolov and St. Trimper, Theoretical study of ion doping and substrate effects in antiferroelectric thin films, phys. stat. sol. (b) 248, 1658-1664 (2011).
20. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, MO.Fe2O3 nanoparticles for self controlled magnetic hyperthermia, J. Appl. Phys. 109, 083939 (2011).
21. J. M. Wesselinowa, A. T. Apostolov, I. N. Apostolova and S. G. Bahoosh, Critical exponents of multiferroic hexagonal RMnO3, Bulg. J. Phys. 38, 420–425 (2011).
22. J. M. Wesselinowa and A. T. Apostolov, Size-dependent properties of Eu chalcogenide nanoparticles, J. Magn. Magn. Mater. 324, 23-25 (2012).
23. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Temperature and layer number dependence of the G and 2D phonon energy and damping in graphene, J. Phys.: Condens. Matter 24, 235401 (2012).
24. S. G. Bahoosh, A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Theory of phonon properties in doped and undoped CuO nanoparticles, Phys. Lett. A 376, 2252-2255 (2012).
25. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Substrate effects on the energy аnd damping of the G and 2D modes in graphene, Solid State Commun. 152, 1980-1984 (2012).
26. I. N. Apostolova, A. T. Apostolov, S. G. Bahoosh and J. M. Wesselinowa, Origin of ferromagnetism in transition metal doped BaTiO3, J. Appl. Phys. 113, 203904 (2013).
27. I. N. Apostolova, A. T. Apostolov and J. M. Wesselinowa, Spin-phonon interaction effects in pure and Fe doped antiferromagnetic Cr2O3 nanoparticles, Solid State Commun. 174, 1–4 (2013).
28. I. N. Apostolova, A. T. Apostolov, S. G. Bahoosh, J. M. Wesselinowa and S.Trimer, Multiferroism in the dielectric function of CuO, phys. stat. sol. RRL 7, 1001-1004 (2013).
29. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Ferrimagnetic nanoparticles for self-controlled magnrtic hyperthermia, Eur. Phys. J. B 86, 483 (2013).
30. A.T. Apostolov, I.N. Apostolova, J.M. Wesselinowa, p- or n-Doping Effects on the Phonon Spectrum of Single- and Bi-Layer Graphene, Bulg. J. Phys. 40, 307-324 (2013).
31. I. N. Apostolova, A. T. Apostolov, S. G. Bahoosh and J. M. Wesselinowa, Room temperature ferromagnetism and phonon properties of pure and doped TiO2 nanoparticles, J. Magn. Magn. Mater. 353, 99-104 (2014).
32. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, The magnetoelectric effect in thin films of ferromagnetic semiconductor La2NiMnO6, phys. stat. sol. (b) 251, 1219 - 1224 (2014).
33. A. T. Apostolov, Origin of multiferroicity in the S = 1/2 chain cuprate LiCu2O2, Phys. Lett. A 378, 1961-1964 (2014).
34. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Dielectric constant of multiferroic pure and doped CuO nanoparticles, Solid State Commun. 192, 71-74 (2014).
35. A. T. Apostolov, I. N. Apostolova, S. G. Bahoosh, S. Trimper and J. M. Wesselinowa, Enhancement of the magnetoelectric effect in doped BaTiO3 nanoparticles, phys. stat. sol. (b) 252, 1839 (2015).
36. S. G. Bahoosh, A. T. Apostolov, I. N. Apostolova, S. Trimper and J. M. Wesselinowa, Theoretical study of the multiferroic properties in M-doped (M=Co,Cr,Mg) ZnO thin films, J. Magn. Magn. Mater. 373, 40 (2015).
37. I. N. Apostolova, A. T. Apostolov, S. G. Bahoosh, S. Trimper and J. M. Wesselinowa, Origin of multiferroism in the charge frustrated LuFe2O4 compound, Phys. Lett. A 379, 743-746 (2015).
38. A. T. Apostolov, I. N. Apostolova, S. G. Bahoosh, S. Trimper, M. T. Georgieva and J. M. Wesselinowa, Multiferroic properties of S = 1/2 chain cuprates LiCuVO4. Comparison with LiCu2O2, Modern Phys. Lett. B 29, №17, 1550086 (2015).
39. I. N. Apostolova, A. T. Apostolov, J. M. Wesselinowa and Trimper, Magnetic and dielectric properties of S = 1/2 chain cuprate Li2ZrCuO4, phys. stat. sol. 252, 2667 (2015).
40. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Microscopic approach to the magnetoelectric coupling in RCrO3 , Modern Phys. Lett. 29, 1550251 (2015).
41. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Theory of magnetic field control on polarization in multiferroic RCrO3 compounds, Europ. Phys. Jour. B 88, 328 (2015).
42. Z. Peykov, T. Spiridonov, A. Apostolov, Inversion of Time in the Classical Kinematics of Material Point, IJSRST 2, Issue 4, 116 (2016).
43. Z. Peykov, A. Apostolov, Inversion of Space in the Classical Kinematics of Material Point, IJSRST 2, Issue 5, 309 (2016).
44. Z. Peykov, A. Apostolov, Inversion of Time and Space in the Classical Kinematics of Material Point, IJSRST 2, Issue 5, 317 (2016).
45. A. Apostolov, Z. Peykov, Dencity of Function in the Mathematical Analysis, IJSRST 2, Issue 6, 238 (2016).
46. Z. Peykov, A. Apostolov and N. Mihailov, Density of Space and Time in the Classical Kinematics of Material Point, IJSRST 2, Issue 6, 471 (2016).
47. A. T. Apostolov, I. N. Apostolova, Green’s Function Theory for Ising Model in Transverse field for Arbitrary Spin, International Journal of Scientific Research in Science and Technology (IJSRST) 2, Issue 6, 414 (2016).
48. A. T. Apostolov, I. N. Apostolova, S. Trimper and J. M. Wesselinowa, Magnetoelectric coupling and spin reorientation in BiFeO3, phys. stat. sol. (b) 254, 1600433 (2017).
49. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Influence of spin-phonon interactions and spin-reorientation transitions on the phonon properties of RCrO3, Modern Phys. Lett. B 31, 170009 (2017).
50. A. T. Apostolov, I. N. Apostolova, S. Trimper and J. M. Wesselinowa, Room temperature ferromagnetism in pure and ion doped SnO2 nanoparticles, Modern Physics Letters B 31, 1750351 (2017).
51. A. T. Apostolov, I. N. Apostolova, S. Trimper and J. M. Wesselinowa, Dielectric properties of multiferroic CuCrO2, Europ. Phys. Jour. B 90, 236 (2017).
52. А. Т. Апостолов, И. Н. Апостолова, Влияние на подложката върху зонната структура и дисперсията на енергията на електроните в еднослоен графен, Годишник на УАСГ 50, Issue 1, 105 (2017).
53. А. Т. Апостолов, И. Н. Апостолова, Аномалия на звуковата скорост в BiFeO3, Годишник на УАСГ 50, Issue 1, 115 (2017).
54. A. T. Apostolov, I. N. Apostolova, Influence of magnetoelectric interaction on the elementary excitation in BiFeO3, International Journal of Scientific Research in Science and Technology (IJSRST) 3, Issue 4, 69 (2017).
55. А. Т. Апостолов, И. Н. Апостолова, Изследване влиянието на магнетоелектричното взаимодействие върху елементарните възбуждания в BiFeO3 наночастици, Годишник на УАСГ 50, Issue 2, 75 ( 2017).
56. А. Т. Апостолов, И. Н. Апостолова, Метод на функциите на Грийн за 1-спин нематична мезофаза, Годишник на УАСГ 50, Issue 2, 95 (2017).
57. A. T. Apostolov , I. N. Apostolova, Microscopic Approach to the Magnetoelectric Coupling in RCrO3 (R = Y, La, Lu and Eu) Compounds, International Advanced Research Journal in Science, Engineering and Technology (IARJSET) 4, Issue 6, 157 (2017).
58. Z. Peykov, A. Apostolov, Classical Kinematics of Material Point in Non-inertial Frames of Reference, International Journal of Scientific Research in Science and Technology (IJSRST) 3, Issue 1, 315 (2017).
59. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, La1-xSrxMnO3 nanoparticles for magnetic hyperthermia, Physica Status Solidi B 255, 1700587 (2018).
60. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, A comparative study of the magnetization in transition metal ion doped CeO2, TiO2 and SnO2 nanoparticles, Physica E: Low-dimensional Systems and Nanostructures 99, 202 (2018).
61. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Theoretical study of room temperature ferromagnetism and band gap energy of pure and ion doped In2O3 nanoparticles, Journal of Magnetism and Magnetic Materials 456, 263 (2018).
62. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Theoretical study of the phonon properties of pure and ion doped CeO2 nanoparticles, Solid State Communications 279, 17 (2018).
63. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Size and doping dependence of the phonon properties of SnO2 nanopartocles, Modern Physics Letter B 32, 1850250 (2018).
64. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Magnetic properties of rare earth-doped SnO2, TiO2 and CeO2 nanoparticles, Physica Status Solidi B 255, 1800179 (2018).
65. A. T. Apostolov, I. N. Apostolova, J. M. Wesselinowa, Theoretical Study of the Multiferroic Behavior of the Magnetic Relaxor Ferroelectric CdCr2S4, Advances in Materials Physics and Chemistry 8, 459-467 (2018).
ISSN Online: 2162-5328 ISSN Print: 2162-531X
66. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Ferroelectricity in the multiferroic delafossite CuFeO2 induced by ion doping or magnetic field, Solid State Communications 292, 11 (2019).
67. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Specific absorption rate in Zn-doted ferrites for self-controlled magnetic hyperthermia, European Physical Journal B 92, 58 (2019). https://doi.org/10.1140/epjb/e2019-90567-2
68. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Phonon properties of delafossite multiferroic compound CuFeO2. Comparison with CuCrO2, Modern Physics Letters B 33, 1950141 (2019).
69. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Magnetic and dielectric properties of pure and ion doped RCrO3 nanoparticles, European Physical Journal B 92, 105 (2019).
70. A. T. Apostolov, I. N. Apostolova, S. Trimper and J. M. Wesselinowa, Origin of ferromagnetism in pure and ion doped pyrite FeS2 nanoparticles, Physica Status Solidi 1900201 (2019).
71. A. T. Apostolov, I. N. Apostolova, S. Trimper and J. M. Wesselinowa, Antiferroelectricity and weak ferromagnetism in rare earth doped multiferroic BiFeO3, Solid State Communications 300, 113692 (2019).
72. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Magnetic, electric and phonon properties of pure and ion-doped multiferroic HfO2 nanoparticles, Годишник на УАСГ 52, Issue 2, 391-403 (2019).
73. А. Т. Апостолов, И. Н. Апостолова и Ю. М. Веселинова, Микроскопичен модел на трансформацията на магнитна енергия в топлина при лечение на тумори с помощта на магнитни наночастици посредством магнитна хипертермия. Теоретичен модел и пресмятания (част I), Годишник на УАСГ 52, Issue 4, 1171-1196 (2019).
74. А. Т. Апостолов, И. Н. Апостолова и Ю. М. Веселинова, Микроскопичен модел на трансформацията на магнитна енергия в топлина при лечение на тумори с помощта на магнитни наночастици посредством магнитна хипертермия. Числени пресмятания и дискусия (част II), Годишник на УАСГ 52, Issue 4, 1197-1223 (2019).
75. A. T. Apostolov, I. N. Apostolova, J. M. Wesselinova, Antiferroelectricity in ZrO2 and Ferroelectricity in Zr, Al, La Doped HfO2 Nanoparticles, Advances in Materials Physics and Chemistry 10, 27-38 (2020). ISSN Online: 2162-5328 ISSN Print: 2162-531X
Doi: 10.4236/ampc.2019.102003
76. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Dielectric Properties in Transition Metal and Rare-Earth-Doped Multiferroic BaTiO3 Nanoparticles, Physica Status Solidi 2000046 (2020). doi: 10.1002/pssb.202000046
77. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Magnetic field effect on the dielectric properties of rare earth doped multiferroic BiFeO3, Journal of Magnetism and Magnetic Materials 513, 167101 (2020). doi: 10.1016/j.jmmm.2020.167101
78. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Co, Fe and Ni ion doped CeO2 nanoparticles for application in magnetic hyperthermia, Journal: Physica E: Low-dimensional Systems and Nanostructures, 124, 114364 (2020).
doi: 10.1016/j.physe.2020.114364
79. I. N. Apostolova, A. T. Apostolov and J. M. Wesselinowa, Multiferroic and phonon properties of pure and ion doped CoCr2O4 -bulk and nanoparticles, Journal of Alloys and Compounds 852,156885 (2021).
doi:10.1016/j.jallcom.2020.156885
80. I. N. Apostolova, A. T. Apostolov and J. M. Wesselinowa, Differences in the multiferroic properties of AgCrS2 and AgCrO2, Solid State Communications 323, 114119 (2021).
doi: 10.1016/j.ssc.2020.114119
81. I. N. Apostolova, A. T. Apostolov and J. M. Wesselinowa, Microscopic theory of the specific absorption rate for self-controlled magnetic hyperthermia, Journal of Magnetism and Magnetic Materials 522, 167504 (2021).
doi.org/10.1016/j.jmmm.2020.167504
82. A.T.Apostolov, I.N.Apostolova and J.M.Wesselinowa, Magnetic and electric properties of multiferroic LiFeP2O7. Comparison with LiCrP2O7, Modern Physics Letters B 33, No. 9, 2150158 (11 pages) (2021).
doi: 10.1142/S021798492150158X
83. I. N. Apostolova, A. T. Apostolov and J. M. Wesselinowa, Electric, dielectric and magnetic properties of Ga, Er and Zn ion doped Fe2O3 thin films, Physics Letters A 393, 127167 (2021).
doi:10.1016/j.physleta.2021.127167
84. I. N. Apostolova, A. T. Apostolov and J. M. Wesselinowa, Magnetic, dielectric and optical properties of Al, Mg, Co and Zn ion doped CuCrO2, Europhysics Letters, 133, 47003 (2021).
doi: 10.1209/0295-5075/133/47003
85. I. N. Apostolova, A. T. Apostolov and J. M. Wesselinowa, Room temperature ferromagnetism inmultiferroic BaCoF4 thin films due to surface, substrate and ion doping effects, Thin Solid Films 722, 138567 (2021).
doi: 10.1016/j.tsf.2021.138567
86. I. N. Apostolova, A. T. Apostolov and J. M. Wesselinowa, Multiferroic and phonon properties at the phase transition of S = 1/2 chain cuprates NaCu2O2. Comparison with
LiCu2O2, Phase Transitions Vol. 94, NOS. 6–8, 527–535 (2021)
doi: 10.1080/01411594.2021.1945059
87. I. N. Apostolova, A. T. Apostolov, S. Trimper and J. M. Wesselinowa, Multiferroic Properties of Pure, Transition Metal, and Rare Earth–Doped BaFe12O19 Nanoparticles, Physica Status Solidi B: Basic Solid State Physics 2100069 (2021).
doi: 10.1002/pssb.202100069
88. I. N. Apostolova, A. T. Apostolov and J. M. Wesselinowa, Enhanced multiferroic properties of relaxor bulk and thin film Na0.5Bi0.5TiO3, Solid State Communications 334-335, 114393 (2021).
doi: 10.1016/j.ssc.2021.114393
89.Z. Peykov, A. Apostolov, Mathematical Problem for the N bodies, International Advanced Research Journal in Science, Engineering and Technology Vol. 8, Issue 6, June2021
doi:10.17148/IARJSET.2021.8601, ISSN (Online) 2393-8021 ISSN (Print) 2394-1588
90. A. T. Apostolov, I. N. Apostolova, J. M. Wesselinowa , Multiferroic properties of the antiferroelectric-antiferromagnetic Cu9O2(SeO3)4Cl6, Physics Letters A 407, 127480 (2021).
doi: 10.1016/j.physleta.2021.127480
91. I. N. Apostolova, A. T. Apostolov, S. Trimper and J. M. Wesselinowa, Dielectric properties of relaxor CuCrO2 at room temperature, Physica Status Solidi B: Basic Solid State Physics, 2100136 (2021).
doi: 10.1002/pssb.202100136
92. A. T. Apostolov, I. N. Apostolova, J. M. Wesselinowa, Multiferroic and phonon properties near the phase transitions of pure and ion doped Ca3Mn2O7, Phase Transitions VOL. 94, NO. 10, 705–714 (2021).
doi: 10.1080/01411594.2021.1966003
93. Angel Apostolov, Iliana Apostolova, Julia Wesselinowa, Multiferroic, phonon and optical properties of pure and ion doped YFeO3 nanoparticles, Nanomaterials, 11, 2731 (2021).
doi: 10.3390/nano11102731
94. Angel Apostolov, Iliana Apostolova, Julia Wesselinowa, Polarization, specific heat, band gap and phonon energy of multiferroic GaV4S8, Solid State Communications 341, 114546 (2022).
doi: 10.1016/j.ssc.2021.114546
95. Iliana Apostolova, Angel Apostolov, J. M. Wesselinowa, Phonon and optical properties of transition metal and rare earth ion doped BaTiO3, Journal of Applied Physics 130(17), 175103 (2021).
doi: 10.1063/5.0069464
96. A. T. Apostolov, I. N. Apostolova, J. M. Wesselinowa , Substrate and doping effects on the multiferroic properties and the band gap of Bi2FeCrO6 thin films, Thin Solid Films 739, 138977 (2021).
doi: 0.1016/j.tsf.2021.138977

97. I. N. Apostolova, A. T. Apostolov and J. M. Wesselinowa, Enhanced multiferroic properties of relaxor bulk and thin film Na0.5Bi0.5TiO3, Solid State Communications 334-335, 114393 (2021). ISSN 0038-1098, Q3, SJR 0,413, IF 1,934
doi: 10.1016/j.ssc.2021.114393

98.Z. Peykov, A. Apostolov, Mathematical Problem for the N bodies, International Advanced Research Journal in Science, Engineering and Technology Vol. 8, Issue 6, June2021 ISSN (Print) 2394-1588, ISSN (Online) 2393-8021
doi:10.17148/IARJSET.2021.8601,
99. A. T. Apostolov, I. N. Apostolova, J. M. Wesselinowa , Multiferroic properties of the antiferroelectric-antiferromagnetic Cu9O2(SeO3)4Cl6, Physics Letters A 407, 127480 (2021). ISSN (Print) 0375-9601, ISSN (Online) 1873-2429, Q2, SJR 0,531, IF 2,707
doi: 10.1016/j.physleta.2021.127480
100. I. N. Apostolova, A. T. Apostolov, S. Trimper and J. M. Wesselinowa, Dielectric properties of relaxor CuCrO2 at room temperature, Physica Status Solidi B: Basic Solid State Physics 258(10), 2100136 (2021).
ISSN (Print) 0370-1972, ISSN (Online) 1521-3951, Q3, SJR 0,414, IF 1,782
doi: 10.1002/pssb.202100136
101. A. T. Apostolov, I. N. Apostolova, J. M. Wesselinowa, Multiferroic and phonon properties near the phase transitions of pure and ion doped Ca3Mn2O7, Phase Transitions 94(10), 705-714 (2021). ISSN (print) 1029-0338, ISSN (online) 0141-1594, Q3, SJR 0,282, IF 1,529
doi: 10.1080/01411594.2021.1966003
102. Angel Apostolov, Iliana Apostolova, Julia Wesselinowa, Multiferroic, phonon and optical properties of pure and ion doped YFeO3 nanoparticles, Nanomaterials 11, 2731 (2021).
ISSN 2079-4991, Q1, SJR 0,839, IF 5,810(2021)
doi: 10.3390/nano11102731
103. Iliana Apostolova, Angel Apostolov, J. M. Wesselinowa, Phonon and optical properties of transition metal and rare earth ion doped BaTiO3, Journal of Applied Physics 130(17), 175103 (2021). ISSN (print) 1089-7550, ISSN (online) 0021-8979, Q2, SJR 0,668, IF 2,877
doi: 10.1063/5.0069464
104. A. T. Apostolov, I. N. Apostolova, J. M. Wesselinowa, Substrate and doping effects on the multiferroic properties and the band gap of Bi2FeCrO6 thin films, Thin Solid Films 739, 138977 (2021). ISSN 0040-6090, Q2, SJR 0,47, IF 2,358
doi: 0.1016/j.tsf.2021.138977
105. Angel Apostolov, Iliana Apostolova, Julia Wesselinowa, Polarization, specific heat, band gap and phonon energy of multiferroic GaV4S8, Solid State Communications 341, 114546 (2022).
ISSN 0038-1098, Q3, SJR 0,389, IF 2,1
doi: 10.1016/j.ssc.2021.114546
106. A. T. Apostolov, I. N. Apostolova, J. M. Wesselinowa, Application of ion doped Y3Fe5O12 nanoparticles for self-controlling magnetic hyperthermia, Physica Status Solidi B: Basic Solid State Physics 259(3), 2100545 (2022).
ISSN (Print) 0370-1972, ISSN (Online) 1521-3951, Q3, SJR 0,401, IF 1,6
doi: 10.1002/pssb.202100545
107. A. T. Apostolov, I. N. Apostolova, J. M. Wesselinowa, Size, external fields and ion doping effects on the multiferroic properties of hexagonal YMnO3 nanoparticles, Materials Today Communications 30, 103123 (2022). ISSN 2352-4928, Q2, SJR 0,62, IF 3,8
doi: 10.1016/j.mtcomm.2022.103123
108. A. T. Apostolov, I. N. Apostolova, J. M. Wesselinowa, Specific Absorption rate in ion doped Y3Fe5O12 nanoparticles for self-controlling magnetic hyperthermia, International Advanced Research Journal in Science, Engineering and Technology (IARJSET) 9(2), 148-163 (2022).
ISSN (Print) 2394-1588, ISSN (Online) 2393-8021
doi: 10.17148/IARJSET.2022.9219
109. A. T. Apostolov, I. N. Apostolova, J. M. Wesselinowa, Origin of multiferroism in Sm2BaCuO5, Solid State Communications 352, 114808 (2022).
ISSN 0038-1098, Q3, SJR 0,41, IF 2,1
doi: 10.1016/j.ssc.2022.114808
110. A. T. Apostolov, I. N. Apostolova, J. M. Wesselinowa, Magnetic and electric properties of multiferroic CuBr2, Journal of Magnetism and Magnetic Materials 560, 169633 (2022).
ISSN 0304-8853, Q2, SJR 0,549, IF 2,7
doi: 10.1016/j.jmmm.2022.169633
111. I. N. Apostolova, A. T. Apostolov and J. M. Wesselinowa, Multiferroic properties of pure and ion doped BiCrO3 - bulk and thin films, Physica Status Solidi B: Basic Solid State Physics 259(11), 2200171 (2022).
ISSN (Print) 0370-1972, ISSN (Online) 1521-3951, Q3, SJR 0,41, IF 1,6
doi: 10.1002/pssb.202200171
112. I. N. Apostolova, A. T. Apostolov, J. M. Wesselinowa, Origin of multiferroism of β-NaFeO2, Magnetochemistry 8, 104 (2022). ISSN 2312-7481, Q2, SJR 0,43, IF 2,7
doi: 10.3390/magnetochemistry8090104
113. I. N. Apostolova, A. T. Apostolov, J. M. Wesselinowa, Theoretical study of the multiferroic properties of DyFeWO6, European Physical Journal B 95, 133 (2022).
ISSN (Print) 1434-6028, ISSN (Online) 1434-6036, Q3, SJR 0,4, IF 1,6
doi: 10.1140/epjb/s10051-022-00396-9
114. A. T. Apostolov, I. N. Apostolova, J. M. Wesselinowa , Magnetic, electric and optical properties of ion doped CuCr2O4 nanoparticles, Magnetochemistry 8, 122 (2022).
ISSN 2312-7481, Q2, SJR 0,42, IF 2,7
doi: 10.3390/magnetochemistry8100122
115. Илиана Апостолова, Ангел Апостолов, Юлия Веселинова, Мултифероици, Светът на физиката, том XLV, кн. 2, стр. 159-173 (2022). ISSN 0861-4210
wop.phys.uni-sofia.bg
116. I. N. Apostolova, A. T. Apostolov, J. M. Wesselinowa, Size and ion doping effects on magnetic, optical and phonon properties of CuAlO2, Magnetochemistry 8, 169 (2022).
ISSN 2312-7481, Q2, SJR 0,42, IF 2,7
doi: 10.3390/magnetochemistry8120169
117. А. Т. Апостолов, И. Н. Апостолова и Ю. М. Веселинова, Физични основи на магнетоелектропорацията. Теоретичен модел. (част I), Годишник на УАСГ 55(4), 707-723 (2022). ISSN 1310-814X
118. А. Т. Апостолов, И. Н. Апостолова и Ю. М. Веселинова, Физични основи на магнетоелектропорацията. Числени пресмятания и дискусия (част II), Годишник на УАСГ 55(4), 725-761 (2022). ISSN 1310-814X
119. Iliana Apostolova, Angel Apostolov and Julia Wesselinowa, Magnetic, phonon and optical properties of transition metal and rare earth ion doped ZnS nanoparticles, Nanomaterials 13, 79 (2023). ISSN 2079-4991, Q1, SJR 0,81, IF 5,3(2022)
doi: 10.3390/nano13010079
120. Iliana Apostolova, Angel Apostolov and Julia Wesselinowa, Band Gap Tuning in Transition Metal and Rare-Earth-Ion-Doped TiO2, CeO2, and SnO2 Nanoparticles, Nanomaterials 13, 145 (2023). ISSN 2079-4991, Q1, SJR 0,81, IF 5,3(2022)
doi: 10.3390/nano13010145
121. A. T. Apostolov, I. N. Apostolova, S. Trimper and J. M. Wesselinowa, Physical Origin of Magnetoelectroporation, Physica Status Solidi B: Basic Solid State Physics 260(3), 2200523 (2023). ISSN (Print) 0370-1972, ISSN (Online) 1521-3951, Q3, SJR 0,41, IF 1,6(2022)
doi: 10.1002/pssb.202200523
122. Iliana Apostolova, Angel Apostolov and Julia Wesselinowa, Magnetic and optical properties of pure and ion doped MnFe2O4 nanoparticles, Magnetochemistry 9, 76 (2023).
ISSN 2312-7481, Q2, SJR 0,42, IF 2,7(2022)
doi: 10.3390/magnetochemistry9030076
123. A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Differences between the multiferroic properties of hexagonal and orthorhombic ion doped YFeO3 nanoparticles, International Journal of Modern Physics B 37(21), 2350201 (13 pages) (2023).
ISSN (Print) 0217-9792, ISSN (Online) 1793-6578, Q3, SJR 0,27, IF 1,7(2022)
doi: 10.1142/S0217979223502016
124. Iliana Apostolova, Angel Apostolov and Julia Wesselinowa, Magnetic, optical and phonon properties of ion doped MgO nanoparticles. Application for magnetic hyperthermia, Materials 16, 2353 (2023). ISSN 19961944, Q2, SJR 0,56, IF 3,4(2022)
doi: 10.3390/ma16062353
125. Iliana Apostolova, Angel Apostolov and Julia Wesselinowa, Comparison of the multiferroic properties of ion doped hexagonal LuFeO3 and LaFeO3 Physica Status Solidi B: Basic Solid State Physics, 2300077 (2023).
ISSN (Print) 0370-1972, ISSN (Online) 1521-3951, Q3, SJR 0,401, IF 1,6(2022)
doi: 10.1002/pssb. 202300077
126. Iliana Apostolova, Angel Apostolov and Julia Wesselinowa, Band gap energy of ion doped multiferroic NaFeO2 nanoparticles, Physica Status Solidi (RRL) - Rapid Research Letters 2300159 (2023).
ISSN (Print) 1862-6254, ISSN (Online), 1862-6270, Q2, SJR 0,73, IF 2,8(2022)
doi: 10.1002/pssr.202300159
127. Iliana Naumova Apostolova, Angel Todorov Apostolov, Julia Mihailova Wesselinowa, Magnetoelectric coupling effects in Tb doped BiFeO3 nanoparticles, Magnetochemistry 9, 142 (2023). ISSN 2312-7481, Q2, SJR 0,42, IF 2,7(2022)
doi: 10.3390/magnetochemistry9060142
128. Iliana Apostolova, Angel Apostolov and Julia Wesselinowa, Size and doping effects on the magnetic and electric properties of Bi2Fe4O9 nanoparticles, European Physical Journal B 96, Article number: 77 (2023).
ISSN (Print) 1434-6028, ISSN (Online) 1434-6036, Q3, SJR 0,379, IF 1,6(2022)
doi: 10.1140/epjb/s10051-023-00550-x
129. Iliana Apostolova, Angel Apostolov and Julia Wesselinowa, Magnetic properties of Gd-Doped Fe3O4 nanoparticles, Applied Sciences 13(11), 6411 (2023).
ISSN 2076-3417, Q2, SJR 0,49, IF 2,7(2022)
doi: 10.3390/app13116411
130. Iliana Apostolova, Angel Apostolov, Steffen Trimper and Julia Wesselinowa, Origin of Multiferroism of Ion Doped at Different Sites: Bi4Ti3O12 Bulk and Nanoparticles, Physica Status Solidi B: Basic Solid State Physics 2300405 (2023).
ISSN (Print) 0370-1972, ISSN (Online) 1521-3951, Q3, SJR 0,401, IF 1,6(2022)
doi: 10.1002/pssb.202300405

131. I. N. Apostolova, A. T. Apostolov and J. M. Wesselinowa, Magnetic, electric and dielectric properties of ion doped Fe2TeO6 nanoparticles, European Physical Journal B 96, 167 (2023). ISSN (Print) 1434-6028, ISSN (Online) 1434-6036, Q3, SJR 0,379, IF 1,6(2022)
doi: 10.1140/epjb/s10051-023-00639-3

132. Angel Todorov Apostolov, Iliana Naumova Apostolova, Julia Mihailowa Wesselinowa, Multiferroic properties of Co, Ru, and La ion doped KBiFe2O5, Materials 17, 1 (2024). ISSN 19961944, Q2, SJR 0,56, IF 3,4(2022)
doi: 10.3390/ma17010001

133. A. T. Apostolov, I. N. Apostolova, J. M. Wesselinowa, Origin of multiferroic properties of pure and ion doped zircon- and scheelite-type DyCrO4, Journal of Magnetism and Magnetic Materials 590, 169633 (2024). ISSN 0304-8853, Q2, SJR 0,549, IF 2,7(2022)
doi: 10.1016/j.jmmm.2023.171652

134. Angel T. Apostolov, Iliana N. Apostolova, Julia M. Wesselinowa, Competition between electron-phonon and spin-phonon interaction on the band gap and phonon spectrum in magnetic semiconductors, Applied Sciences 14, 1686 (2024).
ISSN 20763417, Q2, SJR 0,49, IF 2,2(2022)
doi: 10.3390/app14051686

135. Electric, dielectric and phonon properties of Cu2OCl, Physica Status Solidi (RRL) - Rapid Research Letters 2400005 (2024).
ISSN (Print) 1862-6254, ISSN (Online), 1862-6270, Q2, SJR 0,73, IF 2,8(2022)
doi: 10.1002/pssr.202400005

136. Angel Todorov Apostolov, Iliana Naumova Apostolova, Julia Mihailova
Wesselinowa, Origin of Multiferroism in VOX2 (X = Cl, Br, I) Monolayers Nanomaterials 14, 408 (2024). ISSN 2079-4991, Q1, SJR 0,81, IF 5,3(2022)
doi: 10.3390/nano14050408

137. Iliana N. Apostolova, Angel T. Apostolov, Julia M. Wesselinowa, Band Gap and Polarization Tuning of Ion Doped XNbO3 (X = Li,K,Na,Ag) for Photovoltaic and Energy Storage Applications, Molecules 29, 1011 (2024).
ISSN 14203049, Q2, SJR 0,7, IF 4,6
doi10.3390/molecules29051011

138 A. T. Apostolov, I. N. Apostolova and J. M. Wesselinowa, Doping Effects on the Multiferroic Properties of KNbO3 Nanoparticles, Magnetochemistry 10, 19 (2024).
ISSN 2312-7481, Q2, SJR 0,42, IF 2,7(2022)
doi: 10.3390/magnetochemistry10030019

139. Angel T. Apostolov, Iliana N. Apostolova, Julia M. Wesselinowa, Theoretical Study of Electric, Dielectric, and Optical Properties in Ion Doped Multiferroic SrFe12O19 Nanoparticles, Materials 17, 1544 (2024). ISSN 19961944, Q2, SJR 0,56, IF 3,4(2022)
doi: 10.3390/ma1707154

140. Angel T. Apostolov, Iliana N. Apostolova, and Julia M. Wesselinowa, Band gap energy of ion doped LaMnO3 nanoparticles", Physica Status Solidi B: Basic Solid State Physics 2400135 (2024).
ISSN (Print) 0370-1972, ISSN (Online) 1521-3951, Q3, SJR 0,401, IF 1,6(2022)
doi: 10.1002/pssb.202400135

141. Iliana N. Apostolova, Angel T. Apostolov and Julia Mihailowa Wesselinowa,Theoretical Study of the Magnetic and Optical Properties of Ion-Doped LiMPO4 (M = Fe , Ni, Co, Mn), Materials 17, 1945 (2024). ISSN 19961944, Q2, SJR 0,56, IF 3,4(2022)
doi: 10.3390/ma17091945

142. Angel T. Apostolov, Iliana N. Apostolova and Julia Mihailowa Wesselinowa, Theoretical Study of the Phonon and Electrical Conductivity Properties of Pure and Sr-Doped LaMnO3 Thin Films, Materials 17, 1995 (2024).
ISSN 19961944, Q2, SJR 0,56, IF 3,4(2022)
doi: 10.3390/ma17091995

Участие в научни конференции:
1. I. Apostolova, A. Apostolov, J. Wesselinowa, Magnetic nanoparticles suitable for self-controlled magnetic hyperthermia, European Medical Physics and engineering conference, 18-20 October 2012, Sofia, Bulgaria, ISBN 978-954-91589-3-9.
2. А. Апостолов, Самоконтролираща се магнитна хипертермия при използване на наночастици от типа Mn1-xZnxO.Fe2O3, Международна юбилейна научно-приложна конференция УАСГ 15-17 ноември (2012), София, България, ISBN 978-954-724-049-0.
3. S. G. Bahoosh, A. T. Apostolov, I. N. Apostolova, St. Trimper and J. M. Wesselinowa, The theoretical study of multiferroism in Zn1-x MxO thin films (M = Mg, Co, Cr), Int. Conf. Nanosc. Magn. (ICNM) Istanbul, 2-6 Sept. (2013).
4. S. G. Bahoosh, J. M. Wesselinowa, S. Trimper, A. T. Apostolov and I. N. Apostolova, Multiferroicity in doped and undoped BaTiO3 Nanoparticles, Joint European Symposia on
5. A. Апостолов, И. Апостолова, Микроскопичен анализ на мултифероични свойства на M-дотиран (M=Co,Cr,Mg) ZnO тънък филм, Юбилейна приложна научно-техническа конференция „65 години Хидротехнически факултет и 15 години немскоезиково обучение”, София, 6-7 ноември (2014), публикувано в Годишник на УАСГ, том XLVII, 297 (2014) ISSN 1310-814X.
6. A. Апостолов, И. Апостолова, Феримагнитни наночастици за самосъгласувана хипертермия, Юбилейна приложна научно-техническа конференция „65 години Хидротехнически факултет и 15 години немскоезиково обучение”, София, 6-7 ноември (2014), публикувано в Годишник на УАСГ, том XLVII, 331 (2014) ISSN 1310-814X.
7. И. Апостолова, А. Апостолов, Мултифероиците - предизвикателство на връзката между магнетизма и електричеството в материята, III национален конгрес по физически науки, София, 29.09 - 2.10 (2016).
8. А. Т. Апостолов, И. Н. Апостолова, Микроскопичен модел на мегнетоелектричните взаимодействия в RCrO3 (R = Y, La, Lu и Eu) съединения, доклад на Международна юбилейна научна конференция „75 години УАСГ“ 1 - 3.11 2017, публикувано в Годишник на УАСГ, 51, Issue 2, 179 ( 2018).
9. А. Т. Апостолов, И. Н. Апостолова, Микроскопичен механизъм на спин-преориентационен преход в BiFeO3 тънки филми индуциран от външно електрично поле, доклад на Международна юбилейна научна конференция „75 години УАСГ“ 1 - 3.11 2017, публикувано в Годишник на УАСГ, 51, Issue 2, 155 (2018).
10. И. Н. Апостолова , А. Т. Апостолов, Мултифероиците – обещаващи материали за мултифункционални устройства, доклад на Международна юбилейна научна конференция „75 години УАСГ“ 1 - 3.11 2017.
11. А. Т. Апостолов, Зв. Пейков, Плътност на функция в математическия анализ, доклад на Международна юбилейна научна конференция „75 години УАСГ“ 1 - 3.11 2017.

Участие в научни проекти:
1. The Bulgarian National Science Research Department (project F470/94). - участник
2. Изследване на открито от нас ново явление в нанотънки материали възможност за биосензорно приложение за контрол на качеството на водите. БН-176/15/16 – ЦНИП към УАСГ. - участник
3. Изследване на наноразмерни явления в нови материали. БН-204/17/18 – ЦНИП към УАСГ.
4. Нови ефекти в нанотънки подредени органични филми (Лангмюир Лангмюир-Блоджетови) и използването им за концептуално разработване на ново поколение биосензори за работа в течна среда, с бъдещо приложение за мерене в полеви условия и мониторинг в реално време на трудно откриваеми замърсители на водата (включително и антитероризъм) и/или ранна диагностика на заболявания чрез високо чувствителна детекция на маркери на кръвта. ОПР-03/44 – Фонд научни изследвания, 2018 г. - участник
5. Теоретично и числено моделиране на трансформацията на магнитна енергия в топлина при магнитни наночастици, подходящи за in vivo in vitro приложение при лечение на тумори посредством магнитна хипертермия. БН-219/2019 – ЦНИП към УАСГ. - ръководител

Издадени учебници:
1. М. Надолийски, З. Пейков, А. Апостолов, Учебник по физика (второ преработено издание), ISBN 978-619-160-296-4, София (2014).
2. И. Апостолова, А. Апостолов, Физика с биофизика, ISBN 978-619-160-677-1, София (2016).
3. A. Апостолов, Физични принципи на защитата от шум и вибрации, ISBN 978-619-239-257-4, София (2019).
4. А. Апостолов, Физични основи на топлопренасянето, ISBN 978-619-239-394-6, София (2020).

Монография:
1. А. Апостолов, Мултифероизъм в обемни образци и наноструктури, ISBN 978-619-239-371-7 София, (2020). – рецензент проф. дфн Николай Тончев –ИФТТ БАН.