Experimental and theoretical studies of thermal magnetization noise in GMR heads

被引：30

作者：

Bertram, HN ^{[1
]}

Jin, Z ^{[1
]}

Safonov, VL ^{[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 / 01期

基金：

美国国家科学基金会; 美国安德鲁·梅隆基金会;

关键词：

dynamic damping constants; GMR heads; magnetization noise spectra; thermal fluctuations;

D O I：

10.1109/TMAG.2002.988908

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：

Experimental measurements and theoretical analysis of giant magnetoresistive (GMR) thermal magnetization fluctuation noise are presented. A new form of tensor damping, characteristic of the anisotropic thin-film geometry, is utilized. Rationalization and experimental confirmation for this expanded form are given as well. In general, this noise is inversely proportional to the sensor volume and, at frequencies less than the sensor ferromagnetic resonance (FMR), is proportional to the dynamic damping. Approximate crosstrack anisotropy and stabilization fields are determined from signal transfer curves and utilized to determine damping for each head sensor. Damping parameters do not vary appreciably, although variation is seen even within a given manufacturing batch.

引用

页码：38 / 44

页数：7

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