Tunneling interlayer exchange coupling between oxide ferrimagnets: Analysis for Fe3O4/vac/Fe3O4 case

Han-Chun Wu; Mryasov, O. N.; Radican, K.; Shvets, I. V.
June 2009
Applied Physics Letters;6/29/2009, Vol. 94 Issue 26, p262506
Academic Journal
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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