Enhanced room-temperature magnetoresistance in half-metallic CrO2/polymer composites

被引：30

作者：

Chen, YJ ^{[1
]}

Zhang, XY

Li, ZY

机构：

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

[2] Nanjing Univ, Solid State Microstruct Lab, Nanjing 210008, Peoples R China

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

来源：

CHEMICAL PHYSICS LETTERS | 2003年 / 375卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1016/S0009-2614(03)00816-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Granular CrO2/polystyrene composites were prepared by evaporating polystyrene solution. The composites consisting of the acicular half-metallic CrO2 particles encapsulated properly with a thin layer of insulating polymer can exhibit a large enhancement in room temperature magnetoresistance (MR), up to -8.2% at a low field of 6.5 kOe. The microstructures and thermal behaviors of the composite are analyzed by XRD, SEM, TGA and DSC. The temperature dependence of the electrical resistance is studied at the temperature range (77-298 K). We also argue that the influence of polymer on room temperature MR is more significant than that at low temperature, which may be mainly attributed to spin-dependent tunneling between particles. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：213 / 218

页数：6

共 24 条

[1]

Chen YJ, 2003, CHINESE PHYS LETT, V20, P721, DOI 10.1088/0256-307X/20/5/337

[2] Half-metallic ferromagnetism:: Example of CrO2 (invited) [J].