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A BME Fizika Tanszek Nanoszeminariuman aprilis 8-an (kedden) 10:45-tol a BME F epulet I. lepcsohaz I. emeleten, a Fizika Tanszek szeminariumi szobajaban

Halász Gábor1,2

1. Department of Materials Science and Metallurgy, Cambridge, United Kingdom

2. Rudolf Peierls Centre for Theoretical Physics, Oxford, United Kingdom

Spin-triplet supercurrents in superconductor / ferromagnet heterostructures

cimmel tart eloadast.

Abstract:

In a Josephson junction, the non-superconducting weak link connecting the two superconductors can sustain a finite supercurrent via spin-singlet Cooper pairs penetrating the non-superconducting material. However, if the weak link consists of a ferromagnetic material, this supercurrent decays in only a few nanometers because the presence of magnetism is disruptive for spin-singlet Cooper pairs. In our research, we investigated - both theoretically and experimentally - the possibility of generating a longer-ranged supercurrent through a magnetic material by converting the magnetically sensitive spin-singlet Cooper pairs into spin-triplet Cooper pairs that are robust against magnetism. This conversion is possible for example by introducing non-collinear magnets, helical magnets, or magnetic domain walls into the weak link.


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