GeMn-substituted barium hexaferrite

Author

Feng, Quanyuan

Author_Institution

Sch. of Comput. & Commun. Eng., Southwest Jiaotong Univ., Sichuan, China

fYear

2002

fDate

17-19 Aug. 2002

Firstpage

1146

Lastpage

1148

Abstract

The microwave properties have been studied on polycrystalline hexaferrite BaZn₂(GeMn)_0.2Fe_15.6O₂₇. The X-ray diffraction has shown that the W-type hexaferrites BaZn₂(GeMn)_xFe_16-2xO₂₇ can not be formed at x≥0.5. The anisotropy field of hexaferrite BaZn₂(GeMn)_0.2Fe_15.6O₂₇ measured at room temperature is 7.90×10⁵ A/m. The exchange interaction constants and the contributions to magnetocrystalline anisotropy for various sublattices in BaZn₂(GeMn)_0.2Fe_15.6O₂₇ have been calculated based on the molecular field theory and H.B. Callen´s single ion anisotropy model. The results show that the sublattices 12 k and 2 d have stronger contribution to anisotropy.

Keywords

barium compounds; crystal field interactions; crystal structure; exchange interactions (electron); ferrites; magnetic anisotropy; microwave materials; zinc compounds; 20 C; BaZn₂(GeMn)_0.2Fe_15.6O₂₇; BaZn₂(GeMn)_xFe_16-2xO₂₇; GeMn-substituted barium hexaferrite; W-type hexaferrites; X-ray diffraction; anisotropy field; exchange interaction; magnetocrystalline anisotropy; microwave properties; molecular field theory; polycrystalline hexaferrite; room temperature; single ion anisotropy model; sublattices; Anisotropic magnetoresistance; Barium; Magnetic analysis; Magnetic anisotropy; Magnetic field measurement; Magnetic moments; Magnetic resonance; Magnetization; Temperature measurement; X-ray diffraction;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave and Millimeter Wave Technology, 2002. Proceedings. ICMMT 2002. 2002 3rd International Conference on

Print_ISBN

0-7803-7486-X

Type

conf

DOI

10.1109/ICMMT.2002.1187910

Filename

1187910