Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity: Poster Session

TT 30.20: Poster

Donnerstag, 8. September 2022, 15:00–18:00, P1

Controlling the Critical Current in Ferromagnetic Josephson-Junctions by Magnetization and Microwave Irradiation — •Lukas Kammermeier, Andreas Bloch, Oliver Irtenkauf, and Elke Scheer — Universität Konstanz, Konstanz, Germany

A key building block in superconducting spintronics is a controllable superconducting device that accomodates long-ranged triplet currents [1]. It has been suggested to create long range triplets with the help of ferromagnetic resonance in superconductor-ferromagnet-superconductor (SFS) structures made of conventional s-wave superconductors [2]. Here we explore this possibility by studying the electronic transport in SFS junctions in different geometries and realizations of the F spacer, subject to microwave irradiation, with spin injection and as function of the magnetization state of the ferromagnet. We show that we can manipulate the critical current of overdamped S-S/F-S proximity junctions by several percent by flipping a single domain in the ferromagnet. First results on spin injection will be presented.

[1] J. Linder, W. A. Robinson, Nat. Phys. 11, 307 (2015)

2] S. Takahashi, S. Hikino, M. Mori, J. Martinek, S. Meakawa, Phys. Rev. Lett. 99, 057003 (2007)