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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.