Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 26, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3167360
Keywords
ab initio calculations; density functional theory; exchange interactions (electron); ferrimagnetic materials; iron compounds; magnetic thin films; magnetic tunnelling; spin polarised transport
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Funding
- Science Foundation of Ireland (SFI) [06/IN.1/I91]
- Oak Ridge National Laboratory Division of Scientific User Facilities, U.S. Department of Energy
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We have investigated tunneling interlayer exchange coupling (TIEC) between ferrimagnetic Fe3O4 films via a tunneling barrier. In this investigation we employ ab initio density functional theory to study a generic tunneling junction incorporating ferrimagnets Fe3O4/vac/Fe3O4. In contrast with previously established TIEC theory, calculated thickness dependence is nonmonotonic and accompanied by TIEC sign change. Our calculations clearly demonstrate that TIEC is controlled mainly by an interfacial oxygen induced spin polarization. These results emphasize the importance of localized and strongly directional electronic interactions at the interface, thus showing limitations of free electron model treatment of the problem.
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