Highly sensitive detection and stochastic analysis of magnetization agitation induced in a single layered magnetic wire

被引:1
作者
Yamaguchi, Akinobu [1 ]
Motoi, Keiichi [1 ]
Miyajima, Hideki [1 ]
机构
[1] Keio Univ, Dept Phys, Yokohama, Kanagawa 2238522, Japan
基金
日本学术振兴会;
关键词
Magnetic noise; Ferromagnetic resonance; Stochastic analysis; SPIN NOISE; SPECTROSCOPY; FLUCTUATIONS;
D O I
10.1016/j.jmmm.2015.10.002
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This study shows that broadband magnetic noise in a ferromagnetic wire can be detected over a wide frequency range between 500 MHz and 8 GHz using a lock-in detection technique. The magnetic noise spectrum from a 20 nm-thick single-layered Fe19Ni81 wire biased with a dc current is measured as functions of an external field and dc current. This noise is caused by thermal agitation in magnetization due to ambient temperature and Joule heating. The noise behaviors are well reproduced by a stochastic model. Thus, this paper presents a stochastic analysis of magnetic noise behaviors induced by thermal agitation using a highly sensitive technique for detecting the magnetic noise in a single layered ferromagnetic wire. (C) 2015 Published by Elsevier B.V.
引用
收藏
页码:9 / 15
页数:7
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