Structure, magnetic properties, and exchange coupling in thermally processed NdDyFeCoB/alpha-Fe nanoscale multilayer magnets

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	Structure, magnetic properties, and exchange coupling in thermally processed NdDyFeCoB/alpha-Fe nanoscale multilayer magnets
	W. Liu ; X. Z. Li ; Y. C. Sui ; J. Zhou ; W. J. Ren ; Z. D. Zhang ; D. J. Sellmyer
刊名	Journal of Applied Physics
	2008
卷号	103 期号:7
关键词	remanence enhancement films
ISSN号	0021-8979
中文摘要	The structure and magnetic properties of multilayer magnets with a hard phase (HP1=Nd(13.5)Dy(1.5)Fe(68)Co(10)B(7) or HP2=Nd(14)Dy(1)Fe(68)Co(10)B(7)) and soft phase Fe, prepared by sputtering and subsequent heat treatment, have been investigated. For Si/Ti(20 nm)/[HP1(2.0 nm)/Fe(0.5 nm)]x200/Ti(10 nm) multilayer film, transmission electron microscopy results show that Fe disperses in amorphous NdDyFeCoB alloy. After annealing at 575 degrees C for 5 min, the hard Nd(2)Fe(14)B phase typically with grains of about 50 nm and some amount of alpha-Fe coexist in the film. The grain size of the hard and soft phases can be controlled by the proper thickness of the layer and the period. A coercivity of 7.7 kOe and a ratio M(r)/M(s) of 0.74 are achieved in the multilayer Si/Ti(20 nm)/[HP2(2 nm)/Fe(0.5 nm)]x200/Ti(10 nm). A good squareness of the hysteresis loop (measured even at 200 K) is observed, due to the effective exchange coupling between the magnetically soft and hard nanograins in the film. A pinning-type mechanism dominates the magnetization reversal process. In addition, the effect of the effective anisotropy, the grain size, and interfaces between the magnetically hard and soft phases on the exchange coupling is discussed. (C) 2008 American Institute of Physics.
原文出处	://WOS:000255043200542
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://210.72.142.130/handle/321006/32963]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	W. Liu,X. Z. Li,Y. C. Sui,et al. Structure, magnetic properties, and exchange coupling in thermally processed NdDyFeCoB/alpha-Fe nanoscale multilayer magnets[J]. Journal of Applied Physics,2008,103(7).
APA	W. Liu.,X. Z. Li.,Y. C. Sui.,J. Zhou.,W. J. Ren.,...&D. J. Sellmyer.(2008).Structure, magnetic properties, and exchange coupling in thermally processed NdDyFeCoB/alpha-Fe nanoscale multilayer magnets.Journal of Applied Physics,103(7).
MLA	W. Liu,et al."Structure, magnetic properties, and exchange coupling in thermally processed NdDyFeCoB/alpha-Fe nanoscale multilayer magnets".Journal of Applied Physics 103.7(2008).