Spin and orbital moments of nanoscale Fe3O4 epitaxial thin film on MgO/GaAs(100)
W. Q. Liu, Y. B. Xu, P. K. J. Wong, N. J. Maltby, S. P. Li, X. F., Wang, J. Du, B. You, J. Wu, P. Bencok, R. Zhang
TL;DR
This study investigates the magnetic properties of nanoscale Fe3O4 thin films on MgO/GaAs(100), revealing a substantial orbital magnetic moment and bulk-like total magnetic moment, relevant for spintronic device development.
Contribution
It provides the first direct experimental evidence of a large orbital magnetic moment in nanoscale Fe3O4 epitaxial films on MgO/GaAs(100).
Findings
Total magnetic moment retains 83% of bulk value.
Unquenched orbital moment confirmed at 0.47 μB/f.u.
Large orbital moment observed in nanoscale Fe3O4 film.
Abstract
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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