Asymmetric magnetic disorder observed in thermally activated magnetization reversal of exchange-biased IrMn/CoFe films
- Authors
- Lee, Hun-Sung; Ryu, Kwang-Su; You, Chun-Yeol; Jeon, Kun-Rok; Yang, See-Hun; Parkin, Stuart S.P.; Shin, Sung-Chul
- Issue Date
- Jan-2013
- Publisher
- ELSEVIER
- Keywords
- Exchange-bias; Magnetic disorder; Asymmetry; Thermally activated reversal behavior; Domain wall motion
- Citation
- JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, v.325, pp 13 - 16
- Pages
- 4
- Journal Title
- JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
- Volume
- 325
- Start Page
- 13
- End Page
- 16
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/64867
- DOI
- 10.1016/j.jmmm.2012.07.038
- ISSN
- 0304-8853
1873-4766
- Abstract
- We report an asymmetry of magnetic disorder in exchange-biased IrMn(t(IrMn) = 5-20 nm)/CoFe(50 nm) films observed by means of a Kerr microscope, capable of direct domain observation. From the correlation between the magnetization half-reversal time and applied magnetic field, we find that the magnetization switching in all the films occurs via a thermally activated reversal mechanism for both branches of hysteresis loops. Surprisingly, in the forward branch reversal where the applied magnetic field is antiparallel to the direction of exchange-bias field, degree of magnetic disorder decreases as exchange-bias field increases, which is definitely contrasted with the case of backward branch reversal. This result is likely ascribed to the fact that the local values of exchange-bias field and coercive field are oppositely fluctuating with each other in the film. (C) 2012 Elsevier B.V. All rights reserved.
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Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
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