First-principles investigation of the very large perpendicular magnetic anisotropy at Fe

Title
First-principles investigation of the very large perpendicular magnetic anisotropy at Fe; MgO and Co

Title
MgO and Co; MgO interfaces

Title
MgO interfaces
Authors
H.X. YangM. ChshievB. Dieny이정훈A. Manchon신경호
Issue Date
2011-08
Publisher
Physical review B, Condensed matter and materials physics
Citation
VOL 84, NO 5, 054401-1-054401-5
Abstract
The perpendicular magnetic anisotropy (PMA) arising at the interface between ferromagnetic transition metals and metallic oxides was investigated via first-principles calculations. In this work very large values of PMA, up to 3 erg/㎠, at Fe; MgO interfaces are reported, in agreement with recent experiments. The origin of PMA is attributed to overlap between O-pz and transition metal dz2 orbitals hybridized with dxz(yz) orbitals with stronger spin-orbit coupling-induced splitting around the Fermi level for perpendicularmagnetization orientation. Furthermore, it is shown that the PMA value weakens in the case of over- or underoxidation due to the fact that oxygen pz and transitionmetal dz2 orbital overlap is strongly affected by disorder, in agreement with experimental observations in magnetic tunnel junctions.
URI
http://pubs.kist.re.kr/handle/201004/40230
ISSN
1098-0121
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