Magnetic anisotropy and behaviors of Fe nanoparticles

被引：85

作者：

Ibusuki, T ^{[1
]}

Kojima, S ^{[1
]}

Kitakami, O ^{[1
]}

Shimada, Y ^{[1
]}

机构：

[1] Tohoku Univ, Sci Measurements Res Inst, Sendai, Miyagi, Japan

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2001年 / 37卷 / 04期

基金：

日本学术振兴会;

关键词：

coercivity; dipolar interaction; Fe; fine particle; magnetic anisotropy;

D O I：

10.1109/20.951130

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We have studied the magnetic properties of bcc-Fe fine particles with a diameter D of 3 similar to 40 mn prepared by a vapor condensation process. The particles exhibit uniaxial anisotropy of 2.0 similar to 3.0 x 10(6) erg/cc which is much larger than that of bulk Fe (0.5 x 10(6) erg/cc). Numerical calculations taking into account dipolar interaction and thermal agitation reproduce the particle size dependence of coercivity very well. According to the present work, magnetization reversal of Fe particles proceeds via coherent rotation for D < 15 similar to 20 mn and via incoherent rotation for D > 15 similar to 20 run. It is, however, still uncertain why the magnetic anisotropy of Fe fine particles is uniaxial and so large.

引用

页码：2223 / 2225

页数：3

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