Coercivity and nanostructure in magnetic spinel Mg(Mn,Fe)2O4

被引:38
作者
Zhang, C. L. [1 ]
Yeo, S.
Horibe, Y.
Choi, Y. J.
Guha, S.
Croft, M.
Cheong, S. -W.
Mori, S.
机构
[1] Rutgers State Univ, Rutgers Ctr Emergent Mat, Piscataway, NJ 08854 USA
[2] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA
[3] Osaka Prefecture Univ, Dept Phys, Sakai, Osaka 5998531, Japan
基金
美国国家科学基金会;
关键词
MANGANITES; TRANSITION; SYSTEMS; ALLOYS;
D O I
10.1063/1.2717568
中图分类号
O59 [应用物理学];
学科分类号
摘要
When Fe ions in the ferrimagnetic cubic MgFe2O4 are replaced by Jahn-Teller (JT)-active Mn ions, the structure evolves with two-step processes. For example, the quenched cubic MgMn1.5Fe0.5O4 becomes tetragonal and JT distorted with slow cooling. However, with further slow cooling, the clustering tendency of JT-distorted Mn ions induces the formation of a checkerboard nano-self-assembly consisting of Mn-rich (tetragonal, paramagnetic) and -poor (cubic, ferrimagnetic) rods. This morphological evolution accompanies a drastic modification of ferrimagnetic properties, e.g., the magnetic coercivity changes by similar to 25. The nanocheckerboard assembly with ferrimagnetic nanorods with large shape anisotropy can be a platform for ultra high-density memory devices. (c) 2007 American Institute of Physics.
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页数:3
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