Magnetic properties of granular-type FePt-MgO perpendicular recording media

被引：19

作者：

Zhang, ZG ^{[1
]}

Kang, KG

Suzuki, T

机构：

[1] Toyota Technol Inst, Nagoya, Aichi 4688511, Japan

[2] Brookhaven Natl Lab, Upton, NY 11973 USA

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2004年 / 40卷 / 04期

关键词：

activation volume; FePt; magnetic anisotropy; magnetic recording media;

D O I：

10.1109/TMAG.2004.830218

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：

Granular-type FePt films with perpendicular magnetic anisotropy are fabricated onto glass substrates by annealing FePt/MgO multilayer films. The uniaxial perpendicular magnetic anisotropy constant (K-u) and the activation volume (V*) are obtained by fitting the remanent coercivity as a function of the applied field waiting time using the Sharrock's formula for oriented magnetic grain assembly. K-u increases with annealing temperature and annealing time, as a result of the enhanced chemical ordering in L1(0) phase FePt grains. V* tends to decrease with annealing time revealing the FePt grain separation process by the MgO matrix with annealing. By modifying the initial FePt/MgO multilayer structure and annealing condition, the optimized FePt-MgO film shows a high K. and a small V* value.

引用

页码：2455 / 2457

页数：3

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