摘要
利用随机的自相关函数来描述互不固溶的磁性-非磁性颗粒薄膜体系中传导电子的散射势,从而求得了该体系的电阻率与颗粒尺度的一个函数关系。进而通过引入一个唯象因子以刻划在饱和外磁场下关联长度的增加,得到了巨磁电阻系数的解析表达式,计算结果显示理论能定性地解释磁电阻随铁磁颗粒大小变化的实验结果。
In virtue of stochastic autocorrelation function description of the impurity scattering potential in non-dissoluble magnetic-nonmagnetic granular films, we find a relationship between the resistivity of system and the size of gruanules. Furthermore, by introducing a phenomenological factor to account for the increase of correlation length caused by the external magnetic field, we get an analytical ex-pression for the giant magnetoresistance coffiecient. The calculations show that our theory agrees qualitatively with the experimental results.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1996年第7期1191-1196,共6页
Acta Physica Sinica
基金
国家自然科学基金资助的课题
