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Asymmetric stochasticity of magnetization reversal dynamics in exchange-biased IrMn/CoFe Film

Title
Asymmetric stochasticity of magnetization reversal dynamics in exchange-biased IrMn/CoFe Film
Authors
Lee, Hun-SungRyu, Kwang-SuYou, Chun-YeolJeon, Kun-RokYang, See-HunParkin, Stuart S. P.Shin, Sung-Chul
DGIST Authors
You, Chun-Yeol
Issue Date
2012-04
Citation
Journal of Applied Physics, 111(7)
Type
Article
Article Type
Article; Proceedings Paper
Keywords
FERROMAGNETIC DOMAIN-WALLAVALANCHESANISOTROPYBEHAVIOR
ISSN
0021-8979
Abstract
In this study, we investigated the stochastic nature of domain reversal dynamics in exchange-biased IrMn/CoFe film using a time-resolved Kerr microscope. Interestingly, the statistical distributions of the magnetization half-reversal times for both forward and backward applied fields show that the magnetization reversal dynamics is much more stochastic for the backward branch, where an applied field is parallel to the exchange-bias field direction. The enhanced stochasticity is ascribed to the large degree of magnetic disorder during backward reversal, which induces discrete and random Barkhausen jumps, whereas the forward branch reversal is dominated by a thermally activated depinning process caused by a single potential barrier. This result can be explained by the asymmetry of the magnetic disorder between both branches of a hysteresis loop. © 2012 American Institute of Physics.
URI
http://hdl.handle.net/20.500.11750/6489
DOI
10.1063/1.3694022
Publisher
American Institute of Physics Inc.
Related Researcher
  • Author You, Chun-Yeol Spin Phenomena for Information Nano-devices(SPIN) Lab
  • Research Interests Spintronics; Condensed Matter Physics; Magnetic Materials & Thin Films; Micromagnetic Simulations; Spin Nano-Devices
Files:
There are no files associated with this item.
Collection:
Department of Emerging Materials ScienceSpin Phenomena for Information Nano-devices(SPIN) Lab1. Journal Articles


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