Antiferromagnetic-coupling-induced magnetoresistance enhancement in Fex(TiO2)1-x films

被引：6

作者：

Liu, Hui

Mi, W. B.

Li, Z. Q.

Zhang, D. X.

Wang, Y. X.

Bai, H. L. ^{[1
]}

Zheng, R. K.

Ringer, S. P.

机构：

[1] Nankai Univ, Coll Informat Tech Sci, Dept Elect, Tianjin 300071, Peoples R China

[2] Tianjin Univ, Fac Sci, Inst Adv Mat Phys, Tianjin Key Lab Low Dimensional Mat Phys & Prepar, Tianjin 300072, Peoples R China

[3] Univ Sydney, Australian Key Ctr Microscopy & Microanal, Sydney, NSW 2006, Australia

来源：

APPLIED PHYSICS LETTERS | 2006年 / 88卷 / 23期

基金：

高等学校博士学科点专项科研基金; 中国国家自然科学基金;

关键词：

D O I：

10.1063/1.2209880

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Fe-incorporated amorphous TiO2 films with different Fe volume fractions of 0.46 <= x <= 0.76 were deposited by cosputtering iron and Ti targets in an Ar+O-2 mixture. X-ray diffraction and x-ray photoelectron spectroscopy analyses give a structure of nanosized Fe particles embedded in amorphous TiO2 matrix for the Fe-x(TiO2)(1-x) films. Magnetic measurements show antiferromagnetic coupling between nanoscaled Fe granules when x < 0.60. The magnetoresistance of Fe-0.46(TiO2)(0.54) is about -7.6% at room temperature, which increases dramatically with decreasing temperature below similar to 100 K and reaches -29.3 % at 3 K. This significant enhancement of magnetoresistance can be qualitatively explained by antiferromagnetic coupling between Fe granules. (c) 2006 American Institute of Physics.

引用

页数：3

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