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arXiv · 1305.2308

Exchange Bias driven by Dzyaloshinskii-Moriya interactions

R. Yanes·J. Jackson·L. Udvardi·L. Szunyogh·U. Nowak
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Abstract

The exchange bias effect in compensated IrMn3/Co(111) system is studied using multiscale modeling from "ab initio" to atomistic calculations. We evaluate numerically the out-of-plane hysteresis loops of the bi-layer for different thickness of the ferromagnetic layer. The results show the existence of a perpendicular exchange bias field and an enhancement of the coercivity of the system. In order to elucidate the possible origin of the exchange bias, we analyze the hysteresis loops of a selected bi-layer by tuning the different contributions to the exchange interactions across the interface. Our results indicate that the exchange bias is primarily induced by the Dzyaloshinskii-Moriya interactions, while the coercivity is increased mainly due to a spin-flop mechanism.

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R. Yanes, J. Jackson, L. Udvardi, L. Szunyogh, U. Nowak. 2013-05-10. Exchange Bias driven by Dzyaloshinskii-Moriya interactions. https://doi.org/10.1103/physrevlett.111.217202

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