Direct spatial-temporal observation of Barkhausen avalanche in low dimensional ferromagnetic system

被引：1

作者：

Kim, DH ^{[1
]}

Kang, B ^{[1
]}

Chao, WL ^{[1
]}

Fischer, P ^{[1
]}

Anderson, E ^{[1
]}

Choe, SB ^{[1
]}

Im, MY ^{[1
]}

Shin, SC ^{[1
]}

机构：

[1] Lawrence Berkeley Lab, Ctr Xray Opt, Berkeley, CA USA

来源：

FLUCTUATIONS AND NOISE IN MATERIALS II | 2005年 / 5843卷

关键词：

Barkhausen avalanche; magnetic domain; scaling behavior;

D O I：

10.1117/12.609637

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report our direct observation of the Barkhausen avalanche in ferromagnetic thin film systems, where a collective spin behavior produces nontrivial fluctuations in magnetization change under an external magnetic field. For this study, we develop and use two direct full-field magnetic imaging techniques: magneto-optical microscope magnetometer (MOMM) and magnetic transmission X-ray microscopy (MTXM). From a direct visualization and a statistical analysis of the fluctuating domain images for Co thin films, we investigate the scaling behavior of the Barkhausen avalanche both on spatial and temporal scales using MOMM. We also investigate the reproducibility of the Barkhausen avalanche process. Interestingly, the partially stochastic nucleation behavior is observed for CoCrPt alloy films by means of MTXM on a nanometer scale comparable to the fundamental length scales such as the Barkhausen volume and the grain size of the polycrystalline films. Via these direct full-field observation techniques, dynamic details of Barkhausen avalanche are revealed.

引用

页码：40 / 51

页数：12

共 35 条

[1] DOMAIN-WALL DYNAMICS AND BARKHAUSEN EFFECT IN METALLIC FERROMAGNETIC MATERIALS .2. EXPERIMENTS [J].