High Frequency Properties of Soft Magnetic Ferroxplana Type Ferrites

Autor:	Nobuyuki Hiratsuka, Koichi Kakizaki, Kenji Kamishima, Hitoshi Matsuura, Kenji Kawano
Rok vydání:	2006
Předmět:	Impedance analyzer Magnetic anisotropy Materials science Permeability (electromagnetism) Hexagonal crystal system Mechanical Engineering Initial permeability Materials Chemistry Metals and Alloys Analytical chemistry Frequency dependence Industrial and Manufacturing Engineering Ion
Zdroj:	Journal of the Japan Society of Powder and Powder Metallurgy. 53:268-272
ISSN:	1880-9014 0532-8799
DOI:	10.2497/jjspm.53.268
Popis:	Y-type (Ba2Zn2Fe12O22; Y), M-type (BaCo1.1Ti1.1Fe9.8O19; MCT) and mixture of these hexagonal ferrites (Y+xMCT; x=0∼3) were prepared by the conventional solid-state reaction approach. Samples were made with BaCO3, ZnO, CoO, TiO2 and α-Fe2O3 as starting materials. The frequency dependence of the initial permeability of all samples was measured using an impedance analyzer (HP4291B). The initial permeability of Ba3Zn2Co1.1Ti1.1Fe21.8O41 (x=1) was 23 (at 100MHz), which is the highest value in this study and the Snoek's product of this sample has been reached to 14.7GHz. This value is twice larger than that of Zn2Y. The detailed analysis of frequency dependent permeability curves for these samples strongly suggests that this enhancement of the Snoek's product is due to the change of magnetic anisotropy caused by the substitution of Co2+ and Ti4+ ions for Fe3+ ions.
Databáze:	OpenAIRE
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