Journal
APPLIED PHYSICS LETTERS
Volume 100, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4707380
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- National Science Council of Republic of China [NSC 99-2923-E-007-003-MY2, NSC 100-2221-E-007-064-MY2]
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We have studied the variation of perpendicular magnetic anisotropy (PMA) of CoFeB layers with the oxidation degree of the MgO buffer layers. After annealing at 330 degrees C, the out-of-plane anisotropy field (H-k) of 1.5-nm CoFeB could be optimized to 3.1 kOe. To investigate the orbital hybridization of the Fe-3d and O-2p, the orbital moments per hole (m(orb)/N-h) of Fe in annealed CoFeB layers were extracted by using x-ray magnetic circular dichroism. The dependence of m(orb)/N-h on the oxidation time of MgO coincided with that of H-k, which revealed that PMA of annealed CoFeB originated from the interfacial orbital hybridization. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4707380]
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