Hyperfine interactions in magnetoelectric hexaferrite system

0341131 - FZÚ 2010 RIV NL eng J - Journal Article
Kouřil, K. - Chlan, V. - Štěpánková, H. - Novák, Pavel - Knížek, Karel - Hybler, Jiří - Kimura, T. - Hiraoka, Y. - Buršík, Josef
Hyperfine interactions in magnetoelectric hexaferrite system.
Journal of Magnetism and Magnetic Materials. Roč. 322, 9-12 (2010), s. 1243-1245. ISSN 0304-8853. E-ISSN 1873-4766
R&D Projects: GA MŠMT ME08059; GA AV ČR IAA100100803
Institutional research plan: CEZ:AV0Z10100521; CEZ:AV0Z40320502
Keywords : multiferroics * hexaferrite * NMR
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.689, year: 2010
www.elsevier.com/locate/jmmm

Nuclear magnetic resonance (NMR) in Y-hexaferrite system (Ba1-xSrx)2Zn2Fe12O22 was measured on both monocrystalline and polycrystalline samples at liquid helium temperature. Corresponding ab-initio calculation of the hyperfine parameters was also performed. The signal from 57Fe was detected in the frequency interval 65-76 MHz, while NMR spectrum of 67Zn nuclei occurs between 15 and 30 MHz. Due to the disorder in two tetrahedral sublattices occupied partly by Zn and partly by Fe, the NMR lines are broad and the spectra are poorly resolved. Comparison between the experimentally observed 67Zn spectra and the spectra modelled using the calculated hyperfine parameters was made. It indicates that the spectra of 67Zn can be used to determine the distribution of Zn and Fe between the two tetrahedral sublattices.
Permanent Link: http://hdl.handle.net/11104/0184210