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
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.
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页数:3
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