Magnon-assisted Andreev reflection in a ferromagnet-superconductor junction

Details Magnon-assisted Andreev reflection in a ferromagnet-superconductor junction Magnon-assisted Andreev reflection in a ferromagnet-superconductor junction

2000-10-26

arxiv.org/abs/cond-mat/0010421v1

Europhys. Lett. 56, 583 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 eps figures

Scientific paper

10.1209/epl/i2001-00560-3

We study subgap transport in a ferromagnet-superconductor junction at low temperature due to Andreev reflection. The mismatch of spin polarized current in the ferromagnet and spinless current in the superconductor results in an additional contact resistance which can be reduced by magnon emission in the ferromagnet. Using the s-f model and focusing on half-metallic ferromagnets, we calculate the corresponding nonlinear contribution to the current which is asymmetric with respect to the sign of the bias voltage and is related to the density of states of magnons in the ferromagnet.

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