Anti-phase boundaries pinned abnormal positive magnetoresistance in Mg   doped nanocrystalline zinc spinel ferrite

doi:10.1016/j.cplett.2008.01.011

CORC > 北京大学 > 化学与分子工程学院

	Anti-phase boundaries pinned abnormal positive magnetoresistance in Mg doped nanocrystalline zinc spinel ferrite
	Luo, Feng ; Yan, Chun-Hua
刊名	化学物理学快报
	2008
关键词	SINTERED FE3O4 FERRITES NEGATIVE MAGNETORESISTANCE MAGNETIC-PROPERTIES BEHAVIOR FILMS SUPERLATTICES NANOPARTICLES CROSSOVER
DOI	10.1016/j.cplett.2008.01.011
英文摘要	Ni and Mg substituted Zn1-xMxFe2O4 (M = Ni, Mg) nanocrystals with variable concentration were synthesized by thermal decomposition of EDTA precursor complexes at 600 degrees C. The crossover from negative to positive magnetoresistance (MR) is realized by replacing the doping ions from Ni to Mg in nanocrystalline zinc spinel ferrites. In Zn1-xNixFe2O4 nanocrystalline ferrite, the negative MR is originated from spin-polarized electron tunneling across the grain boundaries. In Zn1-xMgxFe2O4 nanocrystalline ferrite, the electron hopping between the sublattices of A- and B-site is deeply decreased due to Mg doping, which hence suppresses the spin-polarized electron tunneling across the neighbouring grains. Moreover, the enhanced magnetic scattering across the antiferromagnetic-coupled antiphase grain boundaries favors the abnormal positive MR effect. The combination of both the effects causes the abnormal positive MR effect. (c) 2008 Elsevier B.V. All rights reserved.; Chemistry, Physical; Physics, Atomic, Molecular & Chemical; SCI(E); 0; ARTICLE; 4-6; 296-300; 452
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/249296]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Luo, Feng,Yan, Chun-Hua. Anti-phase boundaries pinned abnormal positive magnetoresistance in Mg doped nanocrystalline zinc spinel ferrite[J]. 化学物理学快报,2008.
APA	Luo, Feng,&Yan, Chun-Hua.(2008).Anti-phase boundaries pinned abnormal positive magnetoresistance in Mg doped nanocrystalline zinc spinel ferrite.化学物理学快报.
MLA	Luo, Feng,et al."Anti-phase boundaries pinned abnormal positive magnetoresistance in Mg doped nanocrystalline zinc spinel ferrite".化学物理学快报 (2008).