Anisotropic magnetism and spin-dependent transport in Co nanoparticle embedded ZnO thin films

被引：12
作者：
Li, D. Y. [1 ]
Zeng, Y. J. [1 ]
Pereira, L. M. C. [2 ]
Batuk, D. [3 ]
Hadermann, J. [3 ]
Zhang, Y. Z. [4 ]
Ye, Z. Z. [4 ]
Temst, K. [2 ]
Vantomme, A. [2 ]
Van Bael, M. J. [1 ]
Van Haesendonck, C. [1 ]
机构：
[1] Katholieke Univ Leuven, Lab Solid State Phys & Magnetism, BE-3001 Louvain, Belgium
[2] Katholieke Univ Leuven, Inst Kern Stralingsfys, BE-3001 Louvain, Belgium
[3] Univ Antwerp, Electron Microscopy Mat Sci EMAT, BE-2020 Antwerp, Belgium
[4] Zhejiang Univ, State Key Lab Silicon Mat, Dept Mat Sci & Engn, Hangzhou 310027, Peoples R China
来源：
JOURNAL OF APPLIED PHYSICS | 2013年 / 114卷 / 03期
基金：
比利时弗兰德研究基金会;
关键词：
GIANT MAGNETORESISTANCE; SEMICONDUCTORS; FERROMAGNETISM; SPINTRONICS; NANOWIRES; SYSTEMS; ALLOYS;
D O I：
10.1063/1.4815877
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Oriented Co nanoparticles were obtained by Co ion implantation in crystalline ZnO thin films grown by pulsed laser deposition. Transmission electron microscopy revealed the presence of elliptically shaped Co precipitates with nanometer size, which are embedded in the ZnO thin films, resulting in anisotropic magnetic behavior. The low-temperature resistance of the Co-implanted ZnO thin films follows the Efros-Shklovskii type variable-range-hopping. Large negative magnetoresistance (MR) exceeding 10% is observed in a magnetic field of 1 T at 2.5K and the negative MR survives up to 250K (0.3%). The negative MR reveals hysteresis as well as anisotropy that correlate well with the magnetic properties, clearly demonstrating the presence of spin-dependent transport. (C) 2013 AIP Publishing LLC.
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页数：6
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