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TT: Fachverband Tiefe Temperaturen

TT 8: Focus Session: Emerging Phenomena in Superconducting Low Dimensional Hybrid Systems II

TT 8.3: Talk

Tuesday, September 28, 2021, 14:00–14:15, H7

Conductance anomalies in magnetization-controlled superconductor-ferromagnet-superconductor proximity junctions — •Lukas Kammermeier, Elke Scheer, Angelo di Bernardo, and Maik Kerstingskötter — Universität Konstanz, Konstanz, Germany

A key building block in superconducting spintronics is a controllable superconducting spin triplet device. We study superconducting aluminium contacts, the superconducting properties of which are locally modulated by the inverse proximity effect of an adjacent ferromagnet (cobalt in this case). We show that the zero-field current-voltage characteristics of these devices can be in situ controlled by polarizing the magnet in a parallel magnetic field.

The measurements reveal that we can drive the system into different conductance states controlled by the magnetization state of the ferromagnet. One of these states shows a significant differential conductance increase, which even increases more while the magnetic field is applied, possibly indicating a spin-triplet-dominated transport regime.