Enhancement of Magnetoresistance in Granular CrO2 /Polystyrene Composites
CHEN Ya-Jie1,2 , ZHANG Xiao-Yu1 , LI Zhen-Ya1,3
1 Department of Physics, Suzhou University, Suzhou 215006
2 Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093
3 CCAST (World Laboratory), PO Box 8730, Beijing 100080
Enhancement of Magnetoresistance in Granular CrO2 /Polystyrene Composites
CHEN Ya-Jie1,2 ;ZHANG Xiao-Yu1 ;LI Zhen-Ya1,3
1 Department of Physics, Suzhou University, Suzhou 215006
2 Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093
3 CCAST (World Laboratory), PO Box 8730, Beijing 100080
关键词 ：
72.25.-b ,
72.80.Tm ,
75.47.-m
Abstract ： We present a study of magnetotransport in CrO2 /polystyrene (PS) composites over a range of polystyrene concentration (0-30 wt.%). In the experiment, an obvious enhancement in magnetoresistance (MR) is observed at 77 K and at room temperature as the half-metallic CrO2 particles are encapsulated with a thin layer of insulating polystyrene. The enhanced MR can be interpreted in terms of spin-dependent intergranular tunneling with 4-nm-thick PS barrier. Moreover, it is found that the novel PS barrier contributes to room-temperature MR more significantly than that at 77 K. Temperature dependence of resistance is good agreement with ～ T-1/4 in the temperature range from 77 to 298 K.
Key words ：
72.25.-b
72.80.Tm
75.47.-m
出版日期: 2003-09-01
:
72.25.-b
(Spin polarized transport)
72.80.Tm
(Composite materials)
75.47.-m
(Magnetotransport phenomena; materials for magnetotransport)
引用本文:
CHEN Ya-Jie;ZHANG Xiao-Yu;LI Zhen-Ya;. Enhancement of Magnetoresistance in Granular CrO2 /Polystyrene Composites[J]. 中国物理快报, 2003, 20(9): 1578-1581.
2 /Polystyrene Composites. Chin. Phys. Lett., 2003, 20(9): 1578-1581.
链接本文:
https://cpl.iphy.ac.cn/CN/
或
https://cpl.iphy.ac.cn/CN/Y2003/V20/I9/1578
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