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Spin-injection through an Fe/InAs Interface

M. Zwierzycki·K. Xia·P. J. Kelly·G. E. W. Bauer·I. Turek
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Abstract

The spin-dependence of the interface resistance between ferromagnetic Fe and InAs is calculated from first-principles for specular and disordered (001) interfaces. Because of the symmetry mismatch in the minority-spin channel, the specular interface acts as an efficient spin filter with a transmitted current polarisation between 98 an 89%. The resistance of a specular interface in the diffusive regime is comparable to the resistance of a few microns of bulk InAs. Symmetry-breaking arising from interface disorder reduces the spin asymmetry substantially and we conclude that efficient spin injection from Fe into InAs can only be realized using high quality epitaxial interfaces.

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M. Zwierzycki, K. Xia, P. J. Kelly, G. E. W. Bauer, I. Turek. 2002-04-19. Spin-injection through an Fe/InAs Interface. https://doi.org/10.1103/physrevb.67.092401

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