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Svetoslav Kolev  - - - 
Top co-authors See all
C Henrist

44 shared publications

University of Liège, CESAM-GREEnMAT, Allée du Six-Aout 13, 4000 Liège (Sart Tilman), Belgium

R. Cloots

32 shared publications

GREEnMat, Department of Chemistry, University of Liège, B6a SartTilman, Liège 4000, Belgium

Ivan Nedkov

20 shared publications

Emil Djakov Institute of Electronics, Bulgarian Academy of Sciences, 72, Tsarigradsko Chaussee, 1784 Sofia, Bulgaria

Benedicte Vertruyen

14 shared publications

GREENMAT, CESAM Research Unit, Institute of Chemistry, University of Liege, Sart-Tilman, 4000 Liege, Belgium;(A.D.);(B.V.)

Ch. Ghelev

7 shared publications

E. Djakov Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee, 1784 Sofia, Bulgaria

26
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Publication Record
Distribution of Articles published per year 
(2002 - 2018)
Total number of journals
published in
 
19
 
Publications See all
BOOK-CHAPTER 0 Reads 0 Citations Nanosized Ferrite Materials for Absorption of and Protection from MW Radiation Svetoslav Kolev, Tatyana Koutzarova Published: 27 May 2018
NATO Science for Peace and Security Series B: Physics and Biophysics, doi: 10.1007/978-94-024-1298-7_26
DOI See at publisher website
BOOK-CHAPTER 9 Reads 0 Citations A Comparative Study of the Morphology of Y-Type Hexaferrite Powders Obtained by Sol-Gel Auto-Combustion and Ultrasonic C... Borislava Georgieva, Svetoslav Kolev, Chavdar Ghelev, Tatyan... Published: 27 May 2018
NATO Science for Peace and Security Series B: Physics and Biophysics, doi: 10.1007/978-94-024-1298-7_3
DOI See at publisher website
PROCEEDINGS-ARTICLE 68 Reads 0 Citations Study of the Properties of Co-Substituted Ba2Mg2Fe12O22 Hexaferrites Tatyana Koutzarova, Borislava Georgieva, Svetoslav Kolev, Ki... Published: 17 May 2018
Proceedings of The 3rd International Electronic Conference on Materials Sciences, doi: 10.3390/ecms2018-05229
DOI See at publisher website ABS Show/hide abstract
Multiferroic materials, in which long-range magnetic and ferroelectric orders coexist, have recently been of great interest in the fields of both basic and applied sciences. The Y-type hexagonal ferrite Ba2Mg2Fe12O22 is an example of a multiferroic material. Its single crystals have a relatively high spiral-magnetic transition temperature (~200 K), show multiferroic properties at zero magnetic field, and the direction of the ferroelectric polarization can be controlled by a weak magnetic field (< 0.02 T) [1]. We present a study of the influence of substituting the Mg2+ cations in the Y-type Ba2Mg2Fe12O22 hexaferrites with a magnetic cation, such as Co2+, on the structural and magnetic properties. The Ba2Mg0.4Co1.6Fe12O22 powder was synthesized by sonochemical co-precipitation. High-power ultrasound was applied to assist the co-precipitation process. The precursors produced were synthesized at 1170°С. The XRD spectra of the powders showed the characteristic peaks corresponding to the Y-type hexaferrite structure as a main phase and some CoFe2O4 impurity (< 2%) as second phase. This was also confirmed by Mössbauer spectroscopy measurements. The magnetization values at 50 kOe were 30 emu/g and 26.6 emu/g at 4.2 and 300 K, respectively. The ZFC and FC magnetization curves were obtained at a magnetic field of 500 Oe. The magnetic measurements revealed a magnetic phase transition at 200 K from ferrimagnetic-to-helical spin order. Such a transition is considered as a precondition for the material to exhibit multiferroic properties. [1] K. Taniguchi, N. Abe, S. Ohtani, H. Umetsu, T. Arima, "Ferroelectric polarization reversal by a magnetic field in multiferroic Y-type hexaferrite Ba2Mg2Fe12O22", Appl. Phys. Express, vol. 1, art. num. 031301, 2008.
PROCEEDINGS-ARTICLE 4 Reads 0 Citations Characterization of Y-type hexaferrite Ba2Mg2Fe12O22 powders Borislava Georgieva, Kiril Krezhov, Svetoslav Kolev, Chavdar... Published: 01 May 2017
2017 40th International Spring Seminar on Electronics Technology (ISSE), doi: 10.1109/isse.2017.8000885
DOI See at publisher website
PROCEEDINGS-ARTICLE 1 Read 1 Citation Influence of the preparation methods on the structure and magnetic properties of nanosized Al-substituted barium hexafer... P. Peneva, T. Koutzarova, Svetoslav Kolev, Ch. Ghelev, B. Ve... Published: 01 January 2016
9TH INTERNATIONAL PHYSICS CONFERENCE OF THE BALKAN PHYSICAL UNION (BPU-9), doi: 10.1063/1.4944254
DOI See at publisher website
Article 0 Reads 1 Citation Influence of the agglomeration in the initial suspension (ferrofluid) on the oriented magnetic structure Svetoslav Kolev, T Koutzarova Published: 15 May 2014
Journal of Physics: Conference Series, doi: 10.1088/1742-6596/514/1/012021
DOI See at publisher website
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