Effect of annealing temperature on formation of superparamagnetism in CoFeB/MgO/CoFeB magnetic tunnel junctions

doi:10.1016/j.apsusc.2014.07.015

	Effect of annealing temperature on formation of superparamagnetism in CoFeB/MgO/CoFeB magnetic tunnel junctions
	Cao, Jiangwei ; Liu, Yan; Ren, Yang ; Wei, Fulin ; Freitas, P. P.
	2014-09-30
发表期刊	APPLIED SURFACE SCIENCE
卷号	314 页码:443-446
摘要	We report the annealing effect of CoFeB/MgO/CoFeB magnetic tunnel junctions with a thin free layer. For the junctions with CoFeB free layer below the critical thickness, the MR transfer curves are always hysteresis-free and TMR ratio decreases with increasing annealing temperature. For the junctions with CoFeB free layer above the critical thickness, with increasing annealing temperature, both TMR ratio and coercivity increase firstly and then decrease, and finally hysteresis-free MR transfer curves are obtained. The MR loops without hysteresis can be well fitted by using the Langevin equation, suggesting the formation of superparamagnetic particles in the free layer during the high temperature annealing. This behavior originates from the transformation of the ultra-thin CoFeB free layer during annealing: crystallization process of CoFeB and diffusion at MgO/CoFeB and CoFeB/Ru interfaces. (C) 2014 Elsevier B.V. All rights reserved.
关键词	Magnetic tunnel junction Superparamagnetism Hysteresis
DOI	10.1016/j.apsusc.2014.07.015
收录类别	SCI ; EI ; SCOPUS ; SCIE
ISSN	0169-4332
语种	英语
WOS研究方向	Chemistry ; Materials Science ; Physics
WOS类目	Chemistry, Physical ; Materials Science, Coatings & Films ; Physics, Applied ; Physics, Condensed Matter
WOS记录号	WOS:000341464100059
出版者	ELSEVIER SCIENCE BV
EI入藏号	20143618130744
原始文献类型	Article
EISSN	1873-5584
引用统计	被引频次：12[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.lzufe.edu.cn/handle/39EH0E1M/13383
专题	信息工程与人工智能学院
作者单位	1.Lanzhou Univ, Minist Educ, Key Lab Magnetism & Magnet Mat, Lanzhou 730000, Peoples R China; 2.INESC Microsistemas & Nanotecnol INESC MN, P-1000029 Lisbon, Portugal; 3.IN Inst Nanosci & Nanotechnol, P-1000029 Lisbon, Portugal; 4.Lanzhou Univ Finance & Econ, Sch Informat Engn, Lanzhou 730020, Peoples R China
推荐引用方式 GB/T 7714	Cao, Jiangwei,Liu, Yan,Ren, Yang,et al. Effect of annealing temperature on formation of superparamagnetism in CoFeB/MgO/CoFeB magnetic tunnel junctions[J]. APPLIED SURFACE SCIENCE,2014,314:443-446.
APA	Cao, Jiangwei,Liu, Yan,Ren, Yang,Wei, Fulin,&Freitas, P. P..(2014).Effect of annealing temperature on formation of superparamagnetism in CoFeB/MgO/CoFeB magnetic tunnel junctions.APPLIED SURFACE SCIENCE,314,443-446.
MLA	Cao, Jiangwei,et al."Effect of annealing temperature on formation of superparamagnetism in CoFeB/MgO/CoFeB magnetic tunnel junctions".APPLIED SURFACE SCIENCE 314(2014):443-446.

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