Training Induced Positive Exchange Bias in NiFe/IrMn Bilayers

Details Training Induced Positive Exchange Bias in NiFe/IrMn Bilayers Training Induced Positive Exchange Bias in NiFe/IrMn Bilayers

2009-02-19

arxiv.org/abs/0902.3427v3

Phys. Rev. Lett. 102, 177208 (2009)

Physics

Condensed Matter

Materials Science

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.102.177208

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.

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