Tunnelling interlayer exchange coupling between oxide ferromagnets: Analysis for Fe3O4/vac/Fe3O4 case
Citation:
H. C. Wu, O. N. Mryasov, K. Radican, I. V. Shvets, Tunnelling interlayer exchange coupling between oxide ferromagnets: Analysis for Fe3O4/vac/Fe3O4 case, Applied Physics Letters, 94, 26, 2009, 262506-Download Item:
Abstract:
We have investigated tunneling interlayer exchange coupling (TIEC) between ferrimagnetic
Fe3O4 ?lms 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 here thickness dependence is non-
monotonic and accompanied by TIEC sign change. Our calculations clearly demonstrate that
TIEC is controlled mainly by an interfacial oxygen induced spin polarization. These results em-
phasize 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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http://people.tcd.ie/ivchvetsDescription:
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Author: SHVETS, IGOR
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Applied Physics Letters94
26
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