Coercivity enhancement in exchange biased systems driven by interfacial magnetic frustration

C. Leighton, J. Nogués, B. J. Jönsson-Åkerman, Ivan K. Schuller

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236 Citations (Scopus)

Abstract

We report the temperature and cooling field dependence of the coercivity of exchange biased MnF2/Fe bilayers. When the antiferromagnetic surface is in a state of maximum magnetic frustration and the net exchange bias is zero, we 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. © 2000 The American Physical Society.
Original languageEnglish
Pages (from-to)3466-3469
JournalPhysical Review Letters
Volume84
DOIs
Publication statusPublished - 1 Jan 2000

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