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

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 expla...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2009-10, Vol.45 (10), p.3865-3868
Main Authors: Kim, Dong Young, Yoon, Seok Soo, Kim, Cheol Gi, Tsunoda, M., Takahashi, M.
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Antiferromagnetic materials
Antiferromagnetism
Exchange
Exchange coupling
Ferromagnetism
Grains
Hysteresis loops
Hysteresis losses
Loss measurement
Magnetic anisotropy
Magnetic field measurement
Magnetic fields
Magnetic hysteresis
Magnetism
Magnetization
Perpendicular magnetic anisotropy
Rotation measurement
Rotational
rotational loss
Training
training effect
unpinned antiferromagnetic grains
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Summary: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.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2009.2022955