Training Induced Positive Exchange Bias in NiFe/IrMn Bilayers

Abstract

Positive exchange bias has been observed in the Ni${}_{81}$Fe${}_{19}$/Ir${}_{20}$Mn${}_{80}$ bilayer system via soft x-ray resonant magnetic scattering. After field cooling of the system through the blocking temperature of the antiferromagnet, an initial conventional negative exchange bias is removed after training i. e. successive magnetization reversals, resulting in a positive exchange bias for a temperature range down to 30 K below the blocking temperature (450 K). This new manifestation of magnetic training is discussed in terms of metastable magnetic disorder at the magnetically frustrated interface during magnetization reversal.

4 pages, 3 figures

References in corpus (5)

• Positive and Perpendicular Exchange Bias CoO/Co Bilayers
• Exchange bias effect of ferro-/antiferromagnetic heterostructures
• Reversing the training effect in exchange biased CoO/Co bilayers
• Quantitative description of the azimuthal dependence of the exchange bias effect
• Effect of interfacial coupling on the magnetic ordering in ferro-antiferromagnetic bilayers

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