Title :
GeMn-substituted barium hexaferrite
Author_Institution :
Sch. of Comput. & Commun. Eng., Southwest Jiaotong Univ., Sichuan, China
Abstract :
The microwave properties have been studied on polycrystalline hexaferrite BaZn2(GeMn)0.2Fe15.6O27. The X-ray diffraction has shown that the W-type hexaferrites BaZn2(GeMn)xFe16-2xO27 can not be formed at x≥0.5. The anisotropy field of hexaferrite BaZn2(GeMn)0.2Fe15.6O27 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)0.2Fe15.6O27 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)0.2Fe15.6O27; BaZn2(GeMn)xFe16-2xO27; 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;
Conference_Titel :
Microwave and Millimeter Wave Technology, 2002. Proceedings. ICMMT 2002. 2002 3rd International Conference on
Print_ISBN :
0-7803-7486-X
DOI :
10.1109/ICMMT.2002.1187910
