Tuning exchange bias through zero field cooling from different remanent states above blocking temperature in Ni50Mn36Sb14 alloy

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Abstract

Changing remanent states above blocking temperature (TB) in Ni50Mn36Sb14 alloy has been proven to be an effective way of tuning the value and sign of exchange bias (EB) field. The hysteresis loops at 5 K exhibit double shifted shape, indicating that there are two opposite EB signs resulting from an imprint of domain pattern of ferromagnetic (FM) regions into anti-ferromagetic (AFM) ones during cooling. All the results demonstrate that the interfacial spin configuration plays a crucial role on the origin of EB, while the high cooling field not only induces a single FM domain state above TB but also tunes the fractions of FM and AFM interactions through martensitic transition. (© 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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