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Spin and orbital moments of nanoscale Fe3O4 epitaxial thin film on MgO/GaAs(100)

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arxiv 1503.07902 v1 pith:QO4P75NN submitted 2015-03-26 cond-mat.mtrl-sci

W. Q. Liu , Y. B. Xu , P. K. J. Wong , N. J. Maltby , S. P. Li , X. F. Wang , J. Du , B. You
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J. Wu P. Bencok R. Zhang
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classification cond-mat.mtrl-sci
keywords momentepitaxialfe3o4gaasmagneticnanoscaleorbitalbeen
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Nanoscale Fe3O4 epitaxial thin film has been synthesized on MgO/GaAs(100) spintronic heterostructure, and studied with X-ray magnetic circular dichroism (XMCD). We have observed a total magnetic moment of (3.32 +- 0.1) uB/f.u., retaining 83% of the bulk value. Unquenched orbital moment of (0.47 +- 0.05) uB/f.u. has been confirmed by carefully applying the sum rule. The results offer direct experimental evidence of the bulk-like total magnetic moment and a large orbital moment in the nanoscale fully epitaxial Fe3O4/MgO/GaAs(100) heterostructure, which is significant for spintronics applications.

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