Physics – Condensed Matter – Materials Science
Scientific paper
2007-09-04
Appl. Phys. Lett. 91, 202910 (2007)
Physics
Condensed Matter
Materials Science
4 pages, 4 figures
Scientific paper
10.1063/1.2814961
We report on the structural and electronic properties of the interface between the multiferoic oxide YMnO$_3$ and wide band-gap semiconductor GaN studied with the Hubbard-corrected local spin density approximation (LSDA+U) to density-functional theory (DFT). We find that the band offsets at the interface between antiferromagnetically ordered YMnO$_3$ and GaN are different for spin-up and spin-down states. This behavior is due to the spin splitting of the valence band induced by the interface. The energy barrier depends on the relative orientation of the electric polarization with respect to the polarization direction of the GaN substrate suggesting an opportunity to create magnetic tunnel junctions in this materials system.
Demkov Alexander A.
Fennie Craig J.
Lee Jaekwang
Sai Na
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