DocumentCode
1190090
Title
Co-existence of biquadratic and unidirectional anisotropy in IrMn/CoFe/FeOx/CoFe films
Author
Lai, Chih-Huang ; Shen, Chih-Ta ; Huang, Po Hsiang ; Lin, H.J. ; Chen, C.T.
Author_Institution
Dept. of Mater. Sci. & Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan
Volume
41
Issue
10
fYear
2005
Firstpage
2703
Lastpage
2705
Abstract
We observed the coexistence of biquadratic and unidirectional anisotropy in the CoFe layer by inserting the nano-oxide-layer FeOx in the IrMn/CoFe bilayers. Analyses of X-ray magnetic circular dichroism suggested that the FeOx possessed ferromagnetic components. Mixed valence states of Fe, Fe2+ and Fe3+ were observed in the FeOx layer, which implied that both antiferromagnetic and ferromagnetic components might co-exist in the FeOx layer. The uniaxial anisotropy in CoFe at 90° may originate from the interaction of CoFe with the antiferromagnetic components of the FeOx layer in the presence of interfacial magnetic roughness. The unidirectional anisotropy at 0° may result from the exchange biasing from the IrMn layer through the ferromagnetic components in the FeOxlayer.
Keywords
exchange interactions (electron); magnetic anisotropy; magnetic circular dichroism; magnetic multilayers; IrMn-CoFe-FeO-CoFe; X-ray magnetic circular dichroism; antiferromagnetic components; biquadratic anisotropy; exchange biasing; ferromagnetic components; interfacial magnetic roughness; mixed valence states; nano oxide layer; uniaxial anisotropy; unidirectional anisotropy; Anisotropic magnetoresistance; Antiferromagnetic materials; Couplings; Iron; Magnetic anisotropy; Magnetic separation; Materials science and technology; Perpendicular magnetic anisotropy; Spin valves; Synchrotron radiation; Biquadratic coupling; FeO; exchange biasing; interlayer coupling; nano-oxide-layer;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/TMAG.2005.855225
Filename
1519094
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