Asymmetric magnetic disorder observed in thermally activated magnetization reversal of exchange-biased IrMn/CoFe films

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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.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2013-01
Language
English
Article Type
Article
Citation

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, v.325, pp.13 - 16

ISSN
0304-8853
DOI
10.1016/j.jmmm.2012.07.038
URI
http://hdl.handle.net/10203/103572
Appears in Collection
RIMS Journal Papers
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