Effects of germanium on the electronic transport mechanism in Co-20(Cu1-xGex)(80) nanogranular ribbons

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	Effects of germanium on the electronic transport mechanism in Co-20(Cu1-xGex)(80) nanogranular ribbons
	J. He; Z. D. Zhang; J. P. Liu; D. J. Sellmyer
	2002
发表期刊	Journal of Materials Research
ISSN	0884-2914
卷号	17 期号:12 页码:3050-3055
摘要	The dependency of giant magnetoresistance (GMR) on the nonmagnetic matrix in nanogranular Co-20(Cu1-xGex)(80) ribbons was studied. When the matrix Cu is substituted with semiconductor Ge, the magnetoresistance transitioned from negative to positive at low temperatures. The positive GMR effect is closely related to the quantity of CO/Co3Ge2/Co junctionlike configurations. This result provides evidence for the competition between two types of electronic transport mechanisms in the magnetic granular ribbons: (i) electronic spin-dependent scattering, inducing a negative magnetoresistance and (ii) Coulomb blockade of the electronic tunneling, inducing a positive magnetoresistance.
部门归属	chinese acad sci, met res inst, shenyang natl lab mat sci, shenyang 110016, peoples r china. chinese acad sci, met res inst, int ctr mat phys, shenyang 110016, peoples r china. univ nebraska, dept phys & astron, lincoln, ne 68588 usa. univ nebraska, ctr mat res & anal, lincoln, ne 68588 usa. chinese acad sci, shenyang natl lab mat sci, shenyang 110016, peoples r china.;he, j (reprint author), chinese acad sci, met res inst, shenyang natl lab mat sci, shenyang 110016, peoples r china
关键词	Cu Granular Ribbons Giant Magnetoresistance Films Ni Superlattices Systems Gmr
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WOS记录号	WOS:000179614600012
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/36284
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. He,Z. D. Zhang,J. P. Liu,et al. Effects of germanium on the electronic transport mechanism in Co-20(Cu1-xGex)(80) nanogranular ribbons[J]. Journal of Materials Research,2002,17(12):3050-3055.
APA	J. He,Z. D. Zhang,J. P. Liu,&D. J. Sellmyer.(2002).Effects of germanium on the electronic transport mechanism in Co-20(Cu1-xGex)(80) nanogranular ribbons.Journal of Materials Research,17(12),3050-3055.
MLA	J. He,et al."Effects of germanium on the electronic transport mechanism in Co-20(Cu1-xGex)(80) nanogranular ribbons".Journal of Materials Research 17.12(2002):3050-3055.