X-ray magnetic circular dichroism study of epitaxial magnetite ultrathin film on MgO (100)
W. Q. Liu, M. Y. Song, N. J. Maltby, S. P. Li, J. G. Lin, M. G., Samant, S. S. P. Parkin, P. Bencok, Paul Steadman, Alexey Dobrynin, Y. B. Xu,, R. Zhang
TL;DR
This study uses X-ray magnetic circular dichroism to analyze the magnetic moments of an epitaxial Fe3O4 ultrathin film on MgO, revealing significant orbital moments that could enhance spintronics applications.
Contribution
It provides the first detailed measurement of spin and orbital magnetic moments in ultrathin Fe3O4 films on MgO using XMCD, highlighting the unquenched orbital moment at the interface.
Findings
Ultrathin Fe3O4 film retains ~70% of bulk magnetic moment.
Significant unquenched orbital moment observed at the interface.
Potential implications for electric field-controlled spintronics devices.
Abstract
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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