Previous studies on epitaxial Fe3O4 rings in the context of spin-transfer torque effect have revealed complicated and undesirable domain structures, attributed to the intrinsic fourfold magnetocrystalline anisotropy in the ferrite. In this Letter, we report a viable solution to this problem, utilizing a 6-nm-thick epitaxial Fe3O4 thin film on GaAs(100), where the fourfold magnetocrystalline anisotropy is negligible. We demonstrate that in the Fe3O4 planar wires patterned from our thin film, such a unique magnetic anisotropy system has been preserved, and relatively simple magnetic domain configurations compared to those previous reports can be obtained.
Zhang, W., Wong, P. K. J., Zhang, D., Yuan, S. J., Huang, Z. S., Zhai, Y., ... Xu, Y. B. (2014). Magnetic anisotropies in epitaxial Fe3O4/GaAs(100) patterned structures. AIP advances, 4, . https://doi.org/10.1063/1.4897963