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Proceedings Paper

Direct spatial-temporal observation of Barkhausen avalanche in low-dimensional ferromagnetic system (Invited Paper)
Author(s): Dong-Hyun Kim; Bosun Kang; Weilun Chao; Peter Fischer; Erik Anderson; Sug-Bong Choe; Mi-Young Im; Sung-Chul Shin
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Paper Abstract

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.

Paper Details

Date Published: 23 May 2005
PDF: 12 pages
Proc. SPIE 5843, Fluctuations and Noise in Materials II, (23 May 2005); doi: 10.1117/12.609637
Show Author Affiliations
Dong-Hyun Kim, Lawrence Berkeley National Lab. (United States)
Bosun Kang, Lawrence Berkeley National Lab. (United States)
Weilun Chao, Lawrence Berkeley National Lab. (United States)
Peter Fischer, Lawrence Berkeley National Lab. (United States)
Erik Anderson, Lawrence Berkeley National Lab. (United States)
Sug-Bong Choe, Seoul National Univ. (South Korea)
Mi-Young Im, Korea Advanced Institute of Science and Technology (South Korea)
Sung-Chul Shin, Korea Advanced Institute of Science and Technology (South Korea)


Published in SPIE Proceedings Vol. 5843:
Fluctuations and Noise in Materials II
Peter Svedlindh; Dragana Popovic; Michael B. Weissman, Editor(s)

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