Physics – Condensed Matter – Materials Science
Scientific paper
2010-11-25
Phys. Rev. B 84, 054401 (2011)
Physics
Condensed Matter
Materials Science
4 pages, 6 figures
Scientific paper
10.1103/PhysRevB.84.054401
The perpendicular magnetic anisotropy (PMA) arising at the interface between ferromagnetic transition metals and metallic oxides are investigated via first-principles calculations. In this work very large values of PMA up to 3 erg/cm$^2$ at Fe$|$MgO interfaces are reported in agreement with recent experiments. The origin of PMA is attributed to overlap between O-$p_z$ and transition metal $d_{z^2}$ orbitals hybridized with $d_{xz(yz)}$ orbitals with stronger spin-orbit coupling induced splitting around the Fermi level for perpendicular magnetization orientation. Furthemore, it is shown that the PMA value weakens in case of over- or underoxidation when oxygen $p_z$ and transition metal $d_{z^2}$ orbitals overlap is strongly affected by disorder, in agreement with experimental observations in magnetic tunnel junctions.
Chshiev Mairbek
Dieny Bernard
Lee Jung-Hee
Manchon Aurélien
Shin Kyung-Ho
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