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MAGNETIC-PROPERTIES OF CHEMICAL VAPOR-DEPOSITED COBALT DOPED GAMMA IRON-OXIDE THIN-FILMS

被引：11
作者：
DHARA, S
KOTNALA, RK
RASTOGI, AC
DAS, BK
机构：
[1] Division of Materials, National Physical Laboratory, 110012, Dr. K. S. Krishnan Road
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 1992年 / 31卷 / 12A期
关键词：
CVD; CO-DOPED FE3O4 AND GAMMA-FE2O3 FILMS; MICROSTRUCTURE; COERCIVITY; MAGNETOCRYSTALLINE ANISOTROPY;
D O I：
10.1143/JJAP.31.3853
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Magnetic properties of chemical vapour deposited (CVD) Fe3O4 and gamma-Fe2O3 obtained by co-pyrolysis of ferric and cobaltus acetyl acetonate complexes are described. Saturation magnetization, remanent magnetization and coercivity value of 3.7 kG, 2.2 kG and 820 Oe respectively have been obtained for Co-gamma Fe2O3 films. Chemically vapour deposited Co-Fe3O4 films are laterally inhomogeneous with only a fraction of Co2+ ions at octahedral sites (B sites) of spinnel ferrite and excess Co2+ ions distributed in the interstitial matrix. Oxidation conversion to gamma-Fe2O3 phase at temperatures above 350-degrees-C lead to Co2+ ion diffusion to B sites with activation energy of 0.27 eV. Consequent increase in magneto-crystalline anisotropy results in considerable enhancement in coercivity.
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收藏
页码：3853 / 3857
页数：5
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