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Mapping motion of antiferromagnetic interfacial uncompensated magnetic moment in exchange-biased bilayers

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JournalScientific Reports
DatePublished - 17 Mar 2015
Volume5
Original languageEnglish

Abstract

In this work, disordered-IrMn3/insulating-Y3 Fe5O12 exchange-biased bilayers are studied. The behavior of the net magnetic moment ΔmAFM in the antiferromagnet is directly probed by anomalous and planar Hall effects, and anisotropic magnetoresistance. The ΔmAFM is proved to come from the interfacial uncompensated magnetic moment. We demonstrate that the exchange bias and rotational hysteresis loss are induced by partial rotation and irreversible switching of the ΔmAFM. In the athermal training effect, the state of the ΔmAFM cannot be recovered after one cycle of hysteresis loop. This work highlights the fundamental role of the ΔmAFM in the exchange bias and facilitates the manipulation of antiferromagnetic spintronic devices.

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