Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 15, Pages 3466-3469Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.3466
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We report the temperature and cooling field dependence of the coercivity of exchange biased MnF2/Fe bilayers. When the antiferromagnetic surface is in a stare of maximum magnetic frustration and the net exchange bias is zero, pre observe a strong enhancement of the coercivity, which is proportional to the exchange coupling between the layers. Hence, the coercivity can be tuned in a reproducible and repeatable fashion in the same sample. We propose that a frustrated interface provides local energy minima which effectively pin the propagating domain walls in the ferromagnet, leading to an enhanced coercivity.
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