期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 468, 期 -, 页码 209-214出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2018.05.078
关键词
Magnetite; Thin films; Magnetic anisotropy
资金
- National Research Foundation of Korea [NRF-2015R1D1A1A09057359]
Epitaxial Fe3O4 films on (1 1 0)-oriented SrTiO3 and MgAl2O4 were prepared to investigate the in-plane-direction dependence of the interfacial lattice disorder and its effect on the magnetic property. Transmission electron microscopy images of (1 1 0) Fe3O4/SrTiO3 showed that lattice spots at the interface along the in-plane [ -1 1 0] direction were quite regular, but those along the in-plane [0 01] direction exhibited a distinctive lattice disorder. In contrast, the (1 1 0) Fe3O4/MgAl2O4 exhibited quite regular and smooth interfaces along both in-plane directions. The (1 1 0) Fe3O4 /SrTiO 3 , which keeps structural symmetry across the interface along the in-plane [ -1 1 0] direction but not across the interface along the in-plane [0 01] direction, exhibited improved properties: The in-plane uniaxial magnetic anisotropy was about five times larger than those in the previous reports, and the maximum magnetoresistance was about twice that of the Fe3O4 /MgAl2O4. This suggests that the microscopically anisotropic lattice disorder at the interface can be used to control the uniaxial magnetic anisotropy and the magnetoresistance of a magnetic film for spintronic applications.
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