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

被引：71

作者：

Chen, P ^{[1
]}

Xing, DY

Du, YW

Zhu, JM

Feng, D

机构：

[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China

[2] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 87卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.87.107202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A tunneling-type magnetoresistance (MR) as large as 158% is observed at T = 300 K in a polycrystalline Zn0.41Fe2.59O4 sample, in which the Zn0.41Fe2.59O4 grains are separated by insulating alpha -Fe2O3 boundaries. The huge room-temperature MR is attributed to the high spin polarization of Zn0.41Fe2.59O4 grains and antiferromagnetic correlations between magnetic domains on both sides of the insulating alpha -Fe2O3 boundary. The MR exhibits strong temperature dependence below 100 K and its magnitude is enhanced to reach 1280% at 4.2 K, which may arise from the Coulomb blockade effect.

引用

页码：1 / 107202

页数：4

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