Book Chapter

SPIN-POLARIZED CARRIER INJECTION EFFECT IN FERROMAGNETIC SEMICONDUCTOR/DIFFUSIVE SEMICONDUCTOR/SUPERCONDUCTOR JUNCTIONS

MUNEKATA, H., TANAKA, Y., AKAZAKI, T., GOLUBOV, A. A., SAWA, Y., YOKOYAMA, T., TAKAYANAGI, H., NISHIZAWA, N.

2009

Overview

We study the transport properties of a p-InMnAs/n-InAs/Nb junction, where a p-InMnAs can be regarded as a spin injector. We fabricate the junctions at different distances between InMnAs and Nb electrodes and measure the differential conductance of the n-InAs channel. The conductance varies significantly depending on the direction of the injection current and the distance between the spin injector and the superconductor. We also calculate the conductance in the n-InAs channel by taking into account the exchange field in the InAs channel that is induced by the ferromagnetic semiconductor InMnAs. The difference between the conductance behaviors for different injection current directions can be explained by the inverse proximity effect in which the exchange field is also induced in the superconductor. From the experimental and theoretical results, it can be said that we successively observed the phenomena due to the inverse proximity effect that depends on a spin-polarized carrier injection.

• Publisher: WORLD SCIENTIFIC
• Subject: Magnetic Domain Wall Dynamics and Spin Related Phenomena
• ISBN: 981428212X, 9789814467032, 9789814282130, 9814282138, 9814467030, 9789814282123