Effect of atomic ordering on magnetization decay and activation volume of FePt nanoparticles

被引：7

作者：

Sakuma, H

Nishio, H

Kitamoto, Y

Yamazaki, Y

Yamamoto, H

机构：

[1] Tokyo Inst Technol, Dept Innovat & Engn Mat, Yokohama, Kanagawa 2268502, Japan

[2] Meiji Univ, Dept Elect & Elect Engn, Kawasaki, Kanagawa 2148571, Japan

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2003年 / 39卷 / 05期

基金：

日本学术振兴会;

关键词：

activation volume; atomic ordering; FePt; magnetization decay; nanoparticle;

D O I：

10.1109/TMAG.2003.815590

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：

Magnetic viscosity of two kinds of FePt nanoparticles with different order parameters (0.66 and 0.99) are investigated. Although the sample with the lower order parameter showed greater magnetization decay than that with the higher order parameter, the decay was much smaller than that of a Co-Cr longitudinal thin-film medium with capability of areal density of 40 Gb/si. The two FePt samples had almost the same value of activation volumes (similar to5 x 10(-19) cm(3)) at around their coercivities in spite of the differences in the order parameter and the physical volume of the nanoparticles; their activation volume was equal to or smaller than their physical volume.

引用

页码：2758 / 2760

页数：3

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