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

IMR OpenIR

	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
	2008
发表期刊	Journal of Applied Physics
ISSN	0021-8979
卷号	103 期号:7
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.
部门归属	[liu, w.; zhang, z. d.] chinese acad sci, shenyang natl lab mat sci, met res inst, shenyang 110016, peoples r china. [liu, w.; ren, w. j.; zhang, z. d.] chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china. [liu, w.; li, x. z.; sui, y. c.; zhou, j.; sellmyer, d. j.] univ nebraska, nebraska ctr mat & nanosci, lincoln, ne 68588 usa. [liu, w.; li, x. z.; sui, y. c.; zhou, j.; sellmyer, d. j.] univ nebraska, dept phys & astron, lincoln, ne 68588 usa.;liu, w (reprint author), chinese acad sci, shenyang natl lab mat sci, met res inst, shenyang 110016, peoples r china;wliu@imr.ac.cn
关键词	Remanence Enhancement Films
URL	查看原文
WOS记录号	WOS:000255043200542
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/32963
专题	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).