SKM 2021 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 6: Focus Session: Emerging Phenomena in Superconducting Low Dimensional Hybrid Systems I

TT 6.1: Invited Talk

Tuesday, September 28, 2021, 10:00–10:30, H7

Spin Triplet Superconductivity within Superconductors as Determined by FMR Spin pumping — •Lesley Cohen — Blackett Laboratory Imperial College London

Superconductor (SC)/ ferromagnet (FM) interfaces are of great interest as potential candidates to exploit the spin degree of freedom in superconducting phenomena, leading to potential applications for cryogenic memory and novel computing technologies. Over the last decade, experimental and theoretical studies have established that long-range spin polarized triplet supercurrents can be generated in superconducting/ferromagnetic heterostructures in the presence of magnetic inhomogeneities (e.g. spatially varying magnetization) via the proximity effect in combination with spin mixing and spin rotation processes. Separately it has been predicted that spin-orbit coupling in combination with the ferromagnetic exchange interaction can also generate conditions for the formation of spin triplet superconductivity. In this talk I will introduce the use of ferromagnetic resonance to inject a pure spin current in an interfacial material in close proximity, when that material is a superconductor. At a clean interface spin currents should be blocked from entering the superconductor by the Andreev process. I will discuss the conditions where the opposite appears to be the case and aspects we have learnt so far about using this technique to determine the strength of the spin triplet current within the superconductor under these conditions.