Thermal magnetization noise, damping fundamentals, and mode analysis: Application to a thin film GMR sensor

被引：16
作者：
Bertram, HN [1 ]
Safonov, VL [1 ]
Jin, Z [1 ]
机构：
[1] Univ Calif San Diego, Ctr Magnet Recording Res, La Jolla, CA 92093 USA
来源：
IEEE TRANSACTIONS ON MAGNETICS | 2002年 / 38卷 / 05期
关键词：
damping paramter; magnetoresistance noise; mode analysis; thermal fluctuations;
D O I：
10.1109/TMAG.2002.801909
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：
Magnetization dynamic equations with thermal fluctuations are derived fundamentally for small amplitude oscillations, A tensor form of phenomenological damping occurs whose components reflect a general elliptical magnetization motion. This analysis implies that thermal energy and associated damping must be applied to independent normal modes of the system. As an example, this formulism is applied to a thin film magnetoresistance sensor to rind the eigenmodes for general nonuniform magnetization variations. Examples are given of both the various modes and the noise power spectra.
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页码：2514 / 2519
页数：6
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