Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Superconductivity: Poster Session

TT 21.36: Poster

Montag, 16. März 2015, 15:00–18:00, Poster B

Nonlocal spin-transport measurement of superconductor-ferromagnet nanostructures — •Stefan Kolenda, Michael J. Wolf, Florian Hübler, and Detlef Beckmann — Institut für Nanotechnologie, Karlsruher Institut für Technologie

We present measurements of the nonlocal conductance of nanostructures with several ferromagnetic electrodes lying perpendicular on a superconducting wire. In these strucures nonlocal conductance is mostly given by diffusion of quasiparticles, which are injected by one of the electrodes and detected by an other one. Applying a magnetic field induces a Zeeman splitting in the quasiparticals density of states, which suppreses the relaxation of injected spin imbalance, thus spin transport over distances of several micrometers is found [1][2]. While in the previous experiments the magnetic field was aligned parallel to the ferromagnetic electrodes, we also show measurements applying the magnetic field noncollinear with the magnetization of the ferromagnetic electrodes. We compare our results to the previous case.

[1] F. Hübler et al., Phys. Rev. Lett. 109, 207001 (2012)

[2] C.H.L. Quay et al., Nature Phys. 9, 84 (2013)