Large coercivity and unconventional exchange coupling in manganese-oxide-coated manganese-gallium nanoparticles

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	Large coercivity and unconventional exchange coupling in manganese-oxide-coated manganese-gallium nanoparticles
	J. N. Feng; W. Liu; D. Y. Geng; S. Ma; T. Yu; X. T. Zhao; Z. M. Dai; X. G. Zhao; Z. D. Zhang
	2014
发表期刊	Chinese Physics B
ISSN	1674-1056
卷号	23 期号:8
摘要	The microstructures and magnetic properties of nanoparticles, each composed of an antiferromagnetic (AFM) manganese-oxide shell and a ferromagnetic-like core of manganese-gallium (MnGa) compounds, are studied. The core-shell structure is confirmed by transmission electron microscope (TEM). The ferromagnetic-like core contains three kinds of MnGa binary compounds, i.e., ferrimagnetic (FI) D0(22)-type Mn3Ga, ferromagnetic (FM) Mn8Ga5, and AFM D0(19)-type Mn3Ga, of which the first two correspond respectively to a hard magnetic phase and to a soft one. Decoupling effect between these two phases is found at low temperature, which weakens gradually with increasing temperature and disappears above 200 K. The exchange bias (EB) effect is observed simultaneously, which is caused by the exchange coupling between the AFM shell and FM-like core. A large coercivity of 6.96 kOe (1 Oe = 79.5775 A.m(-1)) and a maximum EB value of 0.45 kOe are achieved at 300 K and 200 K respectively.
部门归属	[liu wei] chinese acad sci, shenyang natl lab mat sci, shenyang 110016, peoples r china. chinese acad sci, int ctr mat phys, inst met res, shenyang 110016, peoples r china. ; liu, w (reprint author), chinese acad sci, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; wliu@imr.ac.cn
关键词	Nanoparticle Core-shell Structure Exchange Coupling Magnetic-properties Mn Films
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73226
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. N. Feng,W. Liu,D. Y. Geng,et al. Large coercivity and unconventional exchange coupling in manganese-oxide-coated manganese-gallium nanoparticles[J]. Chinese Physics B,2014,23(8).
APA	J. N. Feng.,W. Liu.,D. Y. Geng.,S. Ma.,T. Yu.,...&Z. D. Zhang.(2014).Large coercivity and unconventional exchange coupling in manganese-oxide-coated manganese-gallium nanoparticles.Chinese Physics B,23(8).
MLA	J. N. Feng,et al."Large coercivity and unconventional exchange coupling in manganese-oxide-coated manganese-gallium nanoparticles".Chinese Physics B 23.8(2014).