SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: Superconductivity: Tunnelling and Josephson Junctions

TT 20.7: Vortrag

Dienstag, 28. März 2023, 11:00–11:15, HSZ 103

Equal-spin Cooper pair injection in superconducting spintronics devices — •Matthias Eschrig¹ and Xavier Montiel² — ¹Institute of Physics, University of Greifswald, Germany — ²Department of Materials Science & Metallurgy, University of Cambridge, UK

In a number of recent experiments unusual behavior was observed in ferromagnet/ferromagnet/superconductor devices when a precession of the magnetization was induced by ferromagnetic resonance. By using a non-equilibrium Usadel Green function formalism, we solve for spin-resolved distribution functions and demonstrate that the spin injection process in superconductors is governed by the inverse proximity effect in the superconducting layer. We find that equal-spin Cooper pairs, which are produced by the two misaligned ferromagnetic layers, transport spin inside the S layer. This then results in an increase of the injected spin current below the superconducting critical temperature. Our calculations provide the first evidence of the essential role of equal-spin Cooper pairs on spin-transport properties of S/F devices and pave new avenues for the design of superconducting spintronics devices.