Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 7: SC: Heterostructures, Andreev Scattering, Proximity Effect, Coexistence

TT 7.4: Talk

Monday, March 22, 2010, 14:45–15:00, H20

Spin current due to triplet superconductor - ferromagnet interfaces — •Philip Brydon — Technische Universität Dresden, Dresden, Germany

The interface between a superconductor and a ferromagnet is an ideal setting in which to study the complicated interplay of these two phases. Although the relevant physics is now very well understood for a spin singlet pairing state of the superconductor, qualitatively new phenomena can appear for a spin triplet pairing state due to the intrinsic spin structure of the superconductor. One such surprising result is the existence of a bulk spin supercurrent in the triplet superconductor due to spin-flip reflection of triplet Cooper pairs at the superconductor-ferromagnet interface [1,2]. The resulting spin current displays strong similarities to the spontaneous charge current in a conventional Josephson junction. The dependence of the spin current on a number of relevant parameters is studied e.g. the orbital pairing state of the superconductor and the exchange splitting of the ferromagnet. The possibility of unconventional dynamics of the magnetization of the ferromagnet is discussed.

[1] P. M. R. Brydon and D. Manske, Phys. Rev. Lett. 103, 147001 (2009).

[2] P. M. R. Brydon, cond-mat/0908.4065 (Phys. Rev. B, to be published).