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多晶磁性块材电导率晶粒尺寸效应及巨磁阻效应

发表时间:2008-04-15  浏览量:1919  下载量:834
全部作者: 罗威,朱林利,郑晓静
作者单位: 兰州大学力学系
摘 要: 本文针对多晶磁性块体材料电导率的尺寸效应,通过Boltzmann方程并考虑电子自旋相关的晶界散射,讨论了多晶磁性块材电子在晶粒内部的分布及在磁场下的输运性质。考虑晶界散射的主要作用,将晶界散射作为电子输运的边界条件,研究了电导率和晶粒尺寸的关系,给出了电导率的定量表达式。同时考虑在外加磁场的作用下晶粒间磁化强度的相对方向发生转变引起电子自旋方向的变化,表现出明显的磁阻效应。计算结果表明:随着晶粒尺寸的减小,块材电导率显著下降;在晶粒尺寸较小时表现出明显的巨磁阻效应。
关 键 词: 凝聚态物理;电导率;自旋;电子平均自由程;磁化强度;巨磁阻效应;晶粒尺寸
Title: Grain size effect of electical conductivity and giant magnetoresistance effect in bulk magnetic polycrystals
Author: LUO Wei, ZHU Linli, ZHENG Xiaojing
Organization: Department of Mechanics, Lanzhou University
Abstract: Solving Boltzmann equation and considering the spin-dependent grain boundary scattering, the distribution of electrons in grains and the electrical transport properties in applied magnetic field are discussed. Considering the dominate influence of grain boundary scattering, taken as boundary conditions for electrical transport, investigated the dependence of electrical conductivity on grain size. Simultaneously, in applied magnetic field, the reoritention of the relative magnetisation between grains brings the change of spin, and it presents obvious giant magnetoresistance (GMR) effect. The results indicate that as the grain size decreases, the electrical conductivity descends evidently, and when the grain size is much smaller, the GMR effect is more obvious.
Key words: condensed matter physics; electrical conductivity; spin; the mean free path of electron; magnetisation; giant magnetoresistance (GMR) effect; grain size
发表期数: 2008年8月第7期
引用格式: 罗威,朱林利,郑晓静. 多晶磁性块材电导率晶粒尺寸效应及巨磁阻效应[J]. 中国科技论文在线精品论文,2008,1(7):786-792.
 
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