Modeling exchange bias microscopically

Exchange bias is a horizontal shift of the hysteresis loop observed for a ferromagnetic layer in contact with an antiferromagnetic layer. Since exchange bias is related to the spin structure of the antiferromagnet, for its fundamental understanding a detailed knowledge of the physics of the antiferr...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2002-02, Vol.240 (1), p.243-247
Main Authors: Nowak, U., Misra, A., Usadel, K.D.
Format: Article
Language:English
Subjects:
Antiferromagnetics
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Domain effects, magnetization curves, and hysteresis
Exact sciences and technology
Exchange biasing
Heisenberg model
Magnetic multilayers
Magnetic properties and materials
Magnetization curves, hysteresis, Barkhausen and related effects
Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects
Numerical simulations
Other ferromagnetic metals and alloys
Physics
Studies of specific magnetic materials
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Summary:Exchange bias is a horizontal shift of the hysteresis loop observed for a ferromagnetic layer in contact with an antiferromagnetic layer. Since exchange bias is related to the spin structure of the antiferromagnet, for its fundamental understanding a detailed knowledge of the physics of the antiferromagnetic layer is inevitable. A model is investigated where domains are formed in the volume of the AFM stabilized by dilution. These domains become frozen during the initial cooling procedure carrying a remanent net magnetization which causes and controls exchange bias. Varying the anisotropy of the antiferromagnet, we find a non-trivial dependence of the exchange bias on the anisotropy of the antiferromagnet.
ISSN:0304-8853
DOI:10.1016/S0304-8853(01)00813-7