Giant magnetoresistance in quantum magnetic contacts

Details Giant magnetoresistance in quantum magnetic contacts Giant magnetoresistance in quantum magnetic contacts

2002-07-26

arxiv.org/abs/cond-mat/0207650v2

Physics

Condensed Matter

Materials Science

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

Scientific paper

10.1016/S0304-8853(02)01105-8

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.

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