The investigation of giant magnetic moment in ultrathin Fe3O4 films

被引：13
作者：
Guan, Xiaofen [1 ]
Zhou, Guowei [1 ]
Xue, Wuhong [1 ]
Quan, Zhiyong [1 ]
Xu, Xiaohong [1 ]
机构：
[1] Shanxi Normal Univ, Minist Educ, Key Lab Magnet Mol & Magnet Informat Mat, Sch Chem & Mat Sci, Linfen 041004, Peoples R China
来源：
APL MATERIALS | 2016年 / 4卷 / 03期
基金：
国家高技术研究发展计划(863计划);
关键词：
ROOM-TEMPERATURE; POLYCRYSTALLINE; MAGNETORESISTANCE; CONDUCTION; BEHAVIOR;
D O I：
10.1063/1.4944590
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The magnetic and transport properties of Fe3O4 films with a series of thicknesses are investigated. For the films with thickness below 15 nm, the saturation magnetization (M-s) increases and the coercivity decreases with the decrease in films' thickness. The M-s of 3 nm Fe3O4 film is dramatically increased to 1017 emu/cm(3). As for films' thickness more than 15 nm, M-s is tending to be close to the Fe3O4 bulk value. Furthermore, the Verwey transition temperature (T-v) is visible for all the films, but suppressed for 3 nm film. We also find that the. of 3 nm film is the highest of all the films. The suppressed T-v and high. may be related to the islands morphology in 3 nm film. To study the structure, magnetic, and transport properties of the Fe3O4 films, we propose that the giant magnetic moment most likely comes from the spin of Fe ions in the tetrahedron site switching parallel to the Fe ions in the octahedron site at the surface, interface, and grain boundaries. The above results are of great significance and also provide a promising future for either device applications or fundamental research. (C) 2016 Author(s).
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页数：6
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