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Exchange-bias systems with compensated interfaces

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4 Author(s)
Kiwi, Miguel ; Facultad de Fı´sica, Pontificia Universidad Católica, Santiago 22, Chile ; Mejı a-Lopez, Jose ; Portugal, Ruben D. ; Ramı rez, Ricardo

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When a ferromagnetic metal (F) is in contact with an antiferromagnet (AF), often a shift of the hysteresis loop away from its normal, symmetric position around H=0, to HE≠0 does occur. This phenomenon is known as exchange bias (EB). We put forward an analytic model, for compensated AF interfaces, based on the AF interface freezing into a metastable canted spin configuration. The EB energy is reversibly stored in a spring-like magnet, or incomplete domain wall, in the F slab. Our theory yields the right values of HE and its F thickness dependence HE∝tF-1. It also predicts the F layer by layer magnetization profile. © 1999 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:75 ,  Issue: 25 )