Spin-dependent Transport Properties of CrO2 Micro Rod

被引：0

作者：

Zhen Wang ^{[1
]}

Li Xi ^{[1
]}

Yikai Yang ^{[1
]}

Yue Li ^{[1
]}

Xuemeng Han ^{[1
]}

Yalu Zuo ^{[1
]}

Jianbo Wang ^{[1
]}

机构：

[1] Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University

来源：

Nano-Micro Letters | 2014年 / 04期

基金：

中央高校基本科研业务费专项资金资助;

关键词：

CrO2; rod; Low-field magnetoresistance; Tunneling barrier; Bias voltage dependence;

D O I：

暂无

中图分类号：

TQ136.11 [];

学科分类号：

0817 ;

摘要：

The Cr O2 micro rod powder was synthesized by decomposing the Cr O3 flakes at a specific temperature to yield precursor and annealing such a precursor in a sealed glass tube. The magneto-transport properties have been measured by a direct current four-probe method using a Cu/Cr O2rods/colloidal silver liquid electrode sandwich device. The largest magnetoresistance(MR) around *72 % was observed at 77 K with applied current of 0.05 l A. The non-linear I–V curve indicates a tunneling type transport properties and the tunneling barrier height is around 2.2 ± 0.04 e V at 77 K, which is obtained with fitting the non-linear I–V curves using Simmons’ equation. A mixing of Cr oxides on the surface of Cr O2 rod observed by X-ray photoemission spectroscopy provides a tunneling barrier rather than a single phase of Cr2O3 insulating barrier. The MR shows strong bias voltage dependence and is ascribed to the two-step tunneling process.

引用

页码：365 / 371

页数：7

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