Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 41, Issue 10, Pages 2712-2714Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2005.854762
Keywords
crystalline anisotropy; domain pattern; epitaxial bilayer; exchange bias and coercive field
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We have measured the hysteresis loop and torque curves at various applied magnetic field angle in CoFe/MnIr epitaxial bilayers on single crystal MgO (001), (111), and (011) samples. The (001) samples show double shifted magnetization curves, which are dominant as the MnIr thickness increases. It suggests that the unidirectional anisotropy and cubic anisotropy of CoFe (001) layer plays a key role in the formation of double shifted magnetization reversal. The angular variation of exchange bias (Hex) and coercive field (He) depend on the orientation of MgO substrates. The measured results are compared with calculated data, which are fitted using the crystalline anisotropy, unidirectional and uniaxial anisotropy induced by the field annealing. The calculated Hex and He as a function of measuring angles show similar trend as the measured ones. Theses energy contributions play an essential role in the angle dependent magnetization process in epitaxial CoFe/MnIr bilayers.
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