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Subgap transport in ferromagnet-superconductor junctions due to magnon-assisted Andreev reflection | Grygoriy Tkachov
; Edward McCann
; Vladimir I. Fal’ko
; | Date: |
8 Jun 2001 | Journal: | Phys. Rev. B 65, 024519 (2002). | Subject: | Superconductivity; Mesoscopic Systems and Quantum Hall Effect | cond-mat.supr-con cond-mat.mes-hall | Abstract: | 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. | Source: | arXiv, cond-mat/0106161 | Services: | Forum | Review | PDF | Favorites |
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