We investigated perpendicular magnetic anisotropy (PMA) and related properties of epitaxial Fe (0.7 nm)/MgAl2O4(001) heterostructures prepared by electron-beam evaporation. Using an optimized structure, we obtained a large PMA energy ~1 MJ/m3 at room temperature, comparable to that in ultrathin-Fe/MgO(001) heterostructures. Both the PMA energy and saturation magnetization show weak temperature dependence, ensuring wide working temperature in application. The effective magnetic damping constant of the 0.7 nm Fe layer was ~0.02 using time-resolved magneto-optical Kerr effect. This study demonstrates capability of the Fe/MgAl2O4 heterostructure for perpendicular magnetic tunnel junctions, as well as a good agreement with theoretical predictions.
@article{arxiv.1804.06526,
title = {Large perpendicular magnetic anisotropy in epitaxial Fe/MgAl2O4(001) heterostructures},
author = {Qingyi Xiang and Ruma Mandal and Hiroaki Sukegawa and Yukiko K. Takahashi and Seiji Mitani},
journal= {arXiv preprint arXiv:1804.06526},
year = {2018}
}