Giant magnetoresistance in quantum magnetic contacts

Abstract

We present calculations of quantized conductance and magnetoresistance in nanosize point contacts between two ferromagnetic metals. When conductance is open for only one conduction electrons spin-projection, the magnitude of magnetoresistance is limited by the rate of conduction electron spin-reversal processes. For the case when both spin-channels contribute to the conductance we analyze the influence of the point contact cross-section asymmetry on the giant megnetoresistance. Recent experiments on magnetoresistance of magnetic point contacts are discussed in the framework of the developed theory.

11 pages, TEX, 2 Figures. Journ. Magn. Magn. Mater. (2002) submitted

References in corpus (2)

• Ballistic versus diffusive magnetoresistance of a magnetic point contact
• Multivalued dependence of the magnetoresistance on the quantized conductance in nanosize magnetic contacts

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