We report experimental evidence for a transition in the interface coupling between an antiferromagnetic film and a ferromagnetic substrate. The transition is observed in a thin epitaxial NiO film grown on top of Fe(001) as the film thickness is increased. Photoemission electron microscopy excited with linearly polarized x rays shows that the NiO film is antiferromagnetic at room temperature with in-plane uniaxial magnetic anisotropy. The anisotropy axis is perpendicular to the Fe substrate magnetization when the NiO thickness is less than about 15A° , but rapidly becomes parallel to the Fe magnetization for a NiO coverage higher than 25 A° .
Interface Coupling Transition in a Thin Epitaxial Antiferromagnetic Film Interacting with a Ferromagnetic Substrate
FINAZZI, MARCO;BRAMBILLA, ALBERTO;BIAGIONI, PAOLO;DUO', LAMBERTO
2006-01-01
Abstract
We report experimental evidence for a transition in the interface coupling between an antiferromagnetic film and a ferromagnetic substrate. The transition is observed in a thin epitaxial NiO film grown on top of Fe(001) as the film thickness is increased. Photoemission electron microscopy excited with linearly polarized x rays shows that the NiO film is antiferromagnetic at room temperature with in-plane uniaxial magnetic anisotropy. The anisotropy axis is perpendicular to the Fe substrate magnetization when the NiO thickness is less than about 15A° , but rapidly becomes parallel to the Fe magnetization for a NiO coverage higher than 25 A° .File | Dimensione | Formato | |
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Brambilla1_PhysRevLett.97.097202.pdf
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