Spin injection: materials specific theory


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Kelly, P.J. (2002) Spin injection: materials specific theory. In: IEEE International Magnetics Conference, INTERMAG Europe 2002, 28 April-2 May 2002, Amsterdam, The Netherlands.

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Abstract:Summary form only given.
The huge scientific and technological impact of spin-transport in metallic materials has stimulated attempts to study it in semiconductors. The difficulties encountered can be explained in terms of a resistor model in which the small spin-dependent resistivity of typical ferromagnetic metals is completely dominated by the large spin-independent resistivity of the semiconductor. This model neglects the spin-dependent interface resistance caused by band mismatch of the two materials, known to be important in GMR. We calculate the spin-dependence of the interface resistance between ferromagnetic metals (such as Fe) and compound semiconductors (such as InAs) from first-principles whereby specular and diffuse scattering are treated on an equal footing. We focus here on the special case of Fe/InAs which forms an ohmic contact and so should work at low bias voltages. We also consider CaB/sub 6/, a semiconductor with a band gap of 0.8 eV, and the effect of La doping. Magnetism in La/sub x/Ca/sub 1-x/B/sub 6/ is found to occur just on the metallic side of a Mott transition in the La-induced impurity band.
Item Type:Conference or Workshop Item
Copyright:© 2002 IEEE
Faculty:
Science and Technology (TNW)
Research Group:
Link to this item:http://purl.utwente.nl/publications/55894
Official URL:http://dx.doi.org/10.1109/INTMAG.2002.1001250
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