Fe-Ni系列合金超细粉末的磁性和有效磁各向异性常数

Fe100 - xNix alloys of ultrafine particle with the average grain size of about 10 nm were synthesized by mechanically alloying process. The samples were investigated by X-ray diffraction and measurements of the saturation magnetization and coercivity force. Both b. c.c and f. c. c phase exist within...

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Bibliographic Details
Published in上海大学学报(英文版) Vol. 4; no. 2; pp. 155 - 158
Main Authors 许士跃, 何正明, 张正明, 汪仲诚, 陈杭德, 董传华
Format Journal Article
LanguageChinese
Published College of Sciences, Shanghai University, Shanghai 200436, China 2000
Subjects
law of approach to saturation
ultrafine particle
mechanical alloying
strain anisotropy
effective magnetic anisotropy
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Summary:Fe100 - xNix alloys of ultrafine particle with the average grain size of about 10 nm were synthesized by mechanically alloying process. The samples were investigated by X-ray diffraction and measurements of the saturation magnetization and coercivity force. Both b. c.c and f. c. c phase exist within a wide range for Fe100-x Nix, while x≤45. The effective magnetic anisotropy Ke was measured by applying the law of approach to saturation. The value of Ke decreases with an increase of Ni content. It is noticed that the strain anisotropy makes a large contribution to the magnetic anisotropy. The estimation of grain size leads to the determination of the single domain critical size and domain wall energy. The exchange stiffness and exchange integral deduced from the relationship between the effective magnetic anisotropy and domain wall energy are in agreement with that calculated by other methods.
ISSN:1007-6417