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Study of the Properties of Co-Substituted Ba2Mg2Fe12O22 Hexaferrites
Tatyana Koutzarova 1 , Borislava Georgieva 1 , Svetoslav Kolev 1 , Kiril Krezhov 1 , Daniela Kovacheva 2 , Chavdar Ghelev 1 , Benedicte Vertruyen 3 , Frederic Boschini 3 , Abdelfattah Mahmoud 3 , Lan Maria Tran 4 , Andrzej Zaleski 5
1  Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria
2  Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., bld. 11, 1113 Sofia, Bulgaria
3  Greenmat, Chemistry Department, University of Liege, 11 Allée du 6 Août, 4000 Liège, Belgium
4  Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Ul. Okólna 2, 50-422 Wroclaw, Poland
5  Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50422 Wroclaw, Poland

Published: 17 May 2018 by MDPI AG in The 3rd International Electronic Conference on Materials Sciences in The 3rd International Electronic Conference on Materials Sciences session Optical, Electrical and Magnetic Materials
MDPI AG, 10.3390/ecms2018-05229

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.

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