Anomalous training effect of perpendicular exchange bias in Pt/Co/Pt/IrMn multilayers

Shi, Z.; Qiu, X. P.; Zhou, S. M.; Bai, X. J.; Du, J.
December 2008
Applied Physics Letters;12/1/2008, Vol. 93 Issue 22, p222504
Academic Journal
For perpendicularly magnetized Pt/Co/Pt and Pt/Co/Pt/IrMn multilayers, the magnetization reversal process is accompanied by the pinned domain wall motion. For Pt/Co/Pt/IrMn multilayers, the asymmetry of hysteresis loops is always equal to zero and the exchange field HE decreases during consecutive hysteresis loops. It is interesting to find that the variation in HE with the cycle number n cannot be fitted by the empirical 1/n function. Meanwhile, the coercivity almost does not change. The unique feature of the training effect is caused by the magnetization reversal mechanism of the pinned domain wall motion in the Pt/Co/Pt multilayers.


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