Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 8: Magnetic Coupling Phenomena / Exchange Bias

MA 8.7: Talk

Monday, March 23, 2009, 16:45–17:00, HSZ 401

Training Induced Positive Exchange Bias in NiFe/IrMn Bilayers — •S. K. Mishra, F. Radu, H. A. Dürr, and W. Eberhardt — Albert-Einstein Str. 15, D-12489, Berlin, Germany

Positive exchange bias has been observed in the Ni₈₁Fe₁₉/Ir₂₀Mn₈₀ 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 effect is discussed in terms of metastable magnetic disorder at the magnetically frustrated interface during magnetization reversal.