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Dielectric, magnetic and lattice dynamics properties of Y-type hexaferrite Ba.sub.0.5./sub.Sr.sub.1.5./sub.Zn.sub.2./sub.Fe.sub.12./sub.O.sub.22./sub.. Comparison of ceramics and single crystals
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SYSNO ASEP 0347513 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Dielectric, magnetic and lattice dynamics properties of Y-type hexaferrite Ba0.5Sr1.5Zn2Fe12O22. Comparison of ceramics and single crystals Author(s) Kamba, Stanislav (FZU-D) RID, ORCID, SAI
Goian, Veronica (FZU-D) RID, ORCID
Savinov, Maxim (FZU-D) RID, ORCID
Buixaderas, Elena (FZU-D) RID, ORCID
Nuzhnyy, Dmitry (FZU-D) RID, ORCID
Maryško, Miroslav (FZU-D) RID
Kempa, Martin (FZU-D) RID, ORCID
Bovtun, Viktor (FZU-D) RID, ORCID, SAI
Hlinka, Jiří (FZU-D) RID, ORCID
Knížek, Karel (FZU-D) RID, ORCID
Vaněk, Přemysl (FZU-D) RID, ORCID
Novák, Pavel (FZU-D) RID, ORCID
Buršík, Josef (UACH-T) RID, ORCID, SAI
Hiraoka, Y. (JP)
Kimura, T. (JP)
Kouřil, K. (CZ)
Štěpánková, H. (CZ)Source Title Journal of Applied Physics. - : AIP Publishing - ISSN 0021-8979
Roč. 107, č. 10 (2010), 104109/1-104109/7Number of pages 7 s. Language eng - English Country US - United States Keywords multiferroics ; infrared spectroscopy ; phonons ; magnon Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects ME08059 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) IAA100100803 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z10100520 - FZU-D (2005-2011) AV0Z10100521 - FZU-D (2005-2011) AV0Z40320502 - UACH-T (2005-2011) UT WOS 000278182400126 DOI 10.1063/1.3402379 Annotation We prepared multiferroic Y-type hexaferrite Ba0.5Sr1.5Zn2Fe12O22 ceramics and compared their magnetic and dielectric properties with single crystal. Magnetic susceptibility and microwave resonance measurement revealed magnetic phase transition at TC= 312 K, similar as in single crystal. Softening of magnon frequency was observed in the microwave range near TC, but at low temperatures it hardens to THz region on cooling. Ceramics quenched after sintering exhibit several orders of magnitude lower conductivity than the single crystal. Ferroelectric phase can be induced by external magnetic field in all investigated samples and the phase diagram in ceramics qualitatively resembles that of the single crystal. Moreover, we have observed in the single crystal, that the range of magnetic fields, where the ferroelectric phase is induced, broadens after annealing. Number and symmetry of observed infrared and Raman active phonons correspond to paraelectric phase with D3d5 hexagonal structure. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2011
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