Tunneling magnetoresistance in granular composites

被引：11

作者：

Ju, S ^{[1
]}

Li, ZY

机构：

[1] Suzhou Univ, Dept Phys, Suzhou 215006, Peoples R China

[2] CCAST, World Lab, Beijing 100080, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 2002年 / 92卷 / 09期

关键词：

D O I：

10.1063/1.1510569

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The temperature dependence of magnetoresistance in insulating granular systems is studied. At low temperatures the magnetoresistance is enhanced drastically as a result of high-order tunneling. On the other hand, decay of spin polarization will lead to a decrease of magnetoresistance at high temperatures. The role of grain size distribution is investigated and the intergrain correlation is found very crucial in determining the magnitude of magnetoresistance. Our calculations agree with the experimental data well. (C) 2002 American Institute of Physics.

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收藏

页码：5281 / 5285

页数：5

相关论文

共 24 条

[1] GIANT MAGNETORESISTANCE OF (001)FE/(001) CR MAGNETIC SUPERLATTICES [J].

BAIBICH, MN ;

BROTO, JM ;

FERT, A ;

VANDAU, FN ;

PETROFF, F ;

EITENNE, P ;

CREUZET, G ;

FRIEDERICH, A ;

CHAZELAS, J .

PHYSICAL REVIEW LETTERS, 1988, 61 (21) :2472-2475

[2] GIANT MAGNETORESISTANCE IN HETEROGENEOUS CU-CO ALLOYS [J].

BERKOWITZ, AE ;

MITCHELL, JR ;

CAREY, MJ ;

YOUNG, AP ;

ZHANG, S ;

SPADA, FE ;

PARKER, FT ;

HUTTEN, A ;

THOMAS, G .

PHYSICAL REVIEW LETTERS, 1992, 68 (25) :3745-3748

[3] Spin-dependent tunneling in self-assembled cobalt-nanocrystal superlattices [J].

Black, CT ;

Murray, CB ;

Sandstrom, RL ;

Sun, SH .

SCIENCE, 2000, 290 (5494) :1131-1134

[4] Giant room-temperature magnetoresistance in polycrystalline Zn0.41Fe2.59O4 with α-Fe2O3 grain boundaries -: art. no. 107202 [J].

Chen, P ;

Xing, DY ;

Du, YW ;

Zhu, JM ;

Feng, D .

PHYSICAL REVIEW LETTERS, 2001, 87 (10) :1-107202

[5] Magnetoresistance of chromium dioxide powder compacts [J].

Coey, JMD ;

Berkowitz, AE ;

Balcells, L ;

Putris, FF ;

Barry, A .

PHYSICAL REVIEW LETTERS, 1998, 80 (17) :3815-3818

[6] Powder magnetoresistance (invited) [J].

Coey, JMD .

JOURNAL OF APPLIED PHYSICS, 1999, 85 (08) :5576-5581

[7] Temperature dependence of the conductance and magnetoresistance of CrO2 powder compacts -: art. no. 064410 [J].

Dai, JB ;

Tang, JK .

PHYSICAL REVIEW B, 2001, 63 (06)

[8] NEW CLASS OF MATERIALS - HALF-METALLIC FERROMAGNETS [J].

DEGROOT, RA ;

MUELLER, FM ;

VANENGEN, PG ;

BUSCHOW, KHJ .

PHYSICAL REVIEW LETTERS, 1983, 50 (25) :2024-2027

[9] Giant tunneling magnetoresistance in nanostructured ZnxFe3-xO4-α-Fe2O3 polycrystalline material [J].

Du, YW ;

Chen, P ;

Zhu, JM ;

Xing, DY .

ACTA PHYSICA SINICA, 2001, 50 (11) :2275-2277

[10] Spin-flip scattering in magnetic junctions [J].

Guinea, F .

PHYSICAL REVIEW B, 1998, 58 (14) :9212-9216