Spin current in ferromagnet-insulator-superconductor junctions

被引:256
作者
Kashiwaya, S [1 ]
Tanaka, Y
Yoshida, N
Beasley, MR
机构
[1] Stanford Univ, Ginzton Lab, Stanford, CA 94305 USA
[2] Electrotech Lab, Tsukuba, Ibaraki 3058568, Japan
[3] Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan
关键词
D O I
10.1103/PhysRevB.60.3572
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A theory of spin polarized tunneling spectroscopy based on a scattering theory is given for tunneling junctions between ferromagnets and d-wave superconductors. The spin filtering effect of an exchange field in the insulator is also treated. We clarify that the properties of the Andreev reflection are largely modified due to the presence of an exchange field in the ferromagnets, and consequently the Andreev reflected quasiparticle shows an evanescent-wave behavior depending on the injection angle of the quasiparticle. Conductance formulas for the spin current as well as the charge current are given as a function of the applied voltage and the spin polarization in the ferromagnet for arbitrary barrier heights. It is shown that the surface bound states do not contribute to the spin current and that the zero-bias conductance peak expected for a d-wave superconductor splits into two peaks under the influence of the exchange interaction in the insulator. [S0163-1829(99)10729-X].
引用
收藏
页码:3572 / 3580
页数:9
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