Chin. Phys. Lett.  2009, Vol. 26 Issue (11): 117502    DOI: 10.1088/0256-307X/26/11/117502
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Grain Size Effect on Electrical Conductivity and Giant Magnetoresistance of Bulk Magnetic Polycrystals
LUO Wei, ZHU Lin-Li, ZHENG Xiao-Jing
Key Laboratory of Mechanics on Western Disaster and Environment (Ministry of Education) and Department of Mechanics and Engineering Science, College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000
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Abstract By solving the Boltzmann transport equation and considering the spin-dependent grain boundary scattering, the distribution of electrons in grains and the electrical transport properties in the applied magnetic field are studied. With regard to the dominant influence of grain boundary scattering which is taken as a boundary condition for the electrical transport, the grain size-dependent electrical conductivity is investigated. In addition, the reorientation of the relative magnetization between grains brings the change of the electron spin when the magnetonanocrystalline material is subjected to the magnetic field, resulting in the remarkable giant magnetoresistance effect.
Keywords: 75.47.De      73.43.Qt      72.20.-i     
Received: 15 July 2009      Published: 30 October 2009
PACS:  75.47.De (Giant magnetoresistance)  
  73.43.Qt (Magnetoresistance)  
  72.20.-i (Conductivity phenomena in semiconductors and insulators)  
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LUO Wei, ZHU Lin-Li, ZHENG Xiao-Jing 2009 Chin. Phys. Lett. 26 117502
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http://cpl.iphy.ac.cn/10.1088/0256-307X/26/11/117502       OR      http://cpl.iphy.ac.cn/Y2009/V26/I11/117502
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LUO Wei
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