Antiferromagnet Thickness Dependence of the Training Effect in Exchange-Coupled CoFe/MnIr Bilayers

作者：Kim Dong Young^*; Yoon Seok Soo; Kim CheolGi; Tsunoda M; Takahashi M

来源：IEEE Transactions on Magnetics, 2009, 45(10): 3865-3868.

DOI：10.1109/TMAG.2009.2022955

• Exchange coupling
• rotational loss
• training effect
• unpinned antiferromagnetic grains

The antiferromagnet thickness dependence of the net training effect is studied in exchange-coupled CoFe/MnIr bilayers. The maximum net training effect is observed near the critical thickness of the antiferromagnetic layer. The easy-axis redistribution of the unpinned antiferromagneic grains is explained by the two cycles of ferromagnetic-resonance measurement. The linear relationship between the net training effect and rotational hysteresis loss directly confirms that the training effect in ferromagnetic/antiferromagnetic bilayers originates from the reorientation of the unpinned antiferromagnetic grains from initial alignment to the final random state during consecutive cycles of hysteresis loops measurement.

• 出版日期2009-10