Physics – Condensed Matter – Superconductivity
Scientific paper
2001-06-08
Phys. Rev. B 65, 024519 (2002).
Physics
Condensed Matter
Superconductivity
15 pages, 4 eps figures
Scientific paper
10.1103/PhysRevB.65.024519
We propose a new process of magnon-assisted Andreev reflection at a ferromagnetic metal - superconductor interface, which consists of the simultaneous injection of a Cooper pair from the superconductor and the emission of a magnon inside the ferromagnet. At low temperature this process represents an additional channel for sub-gap transport across an FS interface, which lifts restrictions on the current resulting from the necessity to match spin-polarized current in the ferromagnet with spin-less current in the superconductor. For a junction between a superconductor and a ferromagnet with an arbitrary degree of polarization, the inelastic magnon-assisted Andreev reflection process would manifest itself as a nonlinear addition to the $I(V)$ characteristics 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. Expressions for the subgap $I(V)$ characteristics are given for arbitrary interfacial quality whilst the limiting cases of uniformly transparent and disordered interfaces are discussed in detail.
Fal'ko Vladimir. I.
McCann Edward
Tkachov Grygoriy
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