Large perpendicular magnetic anisotropy in epitaxial Fe/MgAl2O4(001) heterostructures

被引：30
|
作者：
Xiang, Qingyi [1 ,2 ]
Mandal, Ruma [2 ]
Sukegawa, Hiroaki [2 ]
Takahashi, Yukiko K. [2 ]
Mitani, Seiji [1 ,2 ]
机构：
[1] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058577, Japan
[2] Natl Inst Mat Sci, Tsukuba, Ibaraki 3058577, Japan
来源：
APPLIED PHYSICS EXPRESS | 2018年 / 11卷 / 06期
关键词：
TUNNEL-JUNCTIONS; MAGNETOCRYSTALLINE ANISOTROPY; ROOM-TEMPERATURE; ULTRATHIN FILMS; MAGNETORESISTANCE; TRANSITION; SURFACES; BARRIERS; AG(100);
D O I：
10.7567/APEX.11.063008
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We investigated the 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 of MJ/m(3) at room temperature, which is comparable to that in ultrathin-Fe/MgO(001) heterostructures. Both the PMA energy and saturation magnetization showed a weak temperature dependence, ensuring a wide working temperature range in applications. The effective magnetic damping constant of the 0.7 nm Fe layer was found to be -41.02 using the time-resolved magneto-optical Kerr effect. This study demonstrated the suitability of the Fe/MgAl2O4 heterostructure for use in perpendicular magnetic tunnel junctions, as well as good agreement with theoretical predictions. (C) 2018 The Japan Society of Applied Physics
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页数：5
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