X-ray magnetic circular dichroism study of epitaxial magnetite ultrathin film on MgO (100)

Alexey Dobrynin; J. G. Lin; M. G. Samant; M. Y. Song; N. J. Maltby; Paul Steadman; P. Bencok; R. Zhang; S. P. Li; S. S. P. Parkin

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X-ray magnetic circular dichroism study of epitaxial magnetite ultrathin film on MgO (100)

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arxiv 1501.01803 v3 pith:ALRWLZTR submitted 2015-01-08 cond-mat.mtrl-sci

W. Q. Liu , M. Y. Song , N. J. Maltby , S. P. Li , J. G. Lin , M. G. Samant , S. S. P. Parkin , P. Bencok

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Paul Steadman Alexey Dobrynin Y. B. Xu R. Zhang

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keywords magneticfe3o4filmmomentorbitalultrathincirculardichroism

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The spin and orbital magnetic moments of the Fe3O4 epitaxial ultrathin film synthesized by plasma assisted simultaneous oxidization on MgO(100) have been studied with X-ray magnetic circular dichroism (XMCD). The ultrathin film retains a rather large total magnetic moment, i.e. (2.7+-0.15) uB/f.u., which is ~ 70% of that for the bulk-like Fe3O4. A significant unquenched orbital moment up to (0.54+-0.05) uB/f.u. was observed, which could come from the symmetry breaking at the Fe3O4/MgO interface. Such sizable orbital moment will add capacities to the Fe3O4-based spintronics devices in the magnetization reversal by the electric field.

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