Magnon-assisted Andreev reflection in a ferromagnet-superconductor junction
Department of Physics, Lancaster University -
Lancaster, LA1 4YB, UK
Accepted: 24 August 2001
A new mechanism for inelastic Andreev reflection at a ferromagnetic metal-superconductor interface is proposed, which consists of the simultaneous injection of a Cooper pair from the superconductor and the emission of a magnon inside the ferromagnet. We find that this process generates an additional contribution to the subgap non-linear 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.
PACS: 73.23.-b – Electronic transport in mesoscopic systems / 74.80.Fp – Point contacts; SN and SNS junctions / 72.25.-b – Spin polarized transport
© EDP Sciences, 2001