A unified theory of CIP and CPP giant magnetoresistance in magnetic sandwiches

被引:23
作者
Vedyayev, A
Chshiev, M
Ryzhanova, N
Dieny, B
Cowache, C
Brouers, F
机构
[1] CEA GRENOBLE,DEPT RECH FONDAMENTALE MAT CONDENSEE,SP2M NM,F-38054 GRENOBLE,FRANCE
[2] INST PHYS,B-4000 LIEGE,BELGIUM
基金
俄罗斯基础研究基金会;
关键词
magnetic multilayers; giant magnetoresistance;
D O I
10.1016/S0304-8853(97)00081-4
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A theory of giant magnetoresistance (GMR) in magnetic sandwiches F/P/F for current in plane (CIP) and current perpendicular to plane (CPP) geometries is developed. We adopted the free electron model described by four parameters: mean free paths and scattering amplitudes (coherent potentials) at the interfaces for spin-up and spin-down electrons. For both CIP and CPP geometries, we calculated the conductivities and GMR using Kubo formalism and the Green function technique in mixed real space-momentum representation. The final expressions for GMR in both geometries were obtained using the same microscopic parameters. Main attention was paid to the relative role of spin-dependent bulk and interfacial scattering. It was shown that increasing of surface scattering for fixed spin asymmetry leads to non-monotonic behaviour of CIP GMR due to renormalization of the scattering amplitude, In the case of CPP geometry the dependence of GMR on interfacial scattering amplitude is monotonic.
引用
收藏
页码:53 / 60
页数:8
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