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arXiv · 1908.00873

Tunable pure spin supercurrents and the demonstration of a superconducting spin-wave device

Kun-Rok Jeon·Xavier Montiel·Sachio Komori·Chiara Ciccarelli·James Haigh·Hidekazu Kurebayashi·Lesley F. Cohen·Chang-Min Lee·Mark G. Blamire·Jason W. A. Robinson
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Abstract

Recent ferromagnetic resonance experiments and theory of Pt/Nb/Ni8Fe2 proximity-coupled structures strongly suggest that spin-orbit coupling (SOC) in Pt in conjunction with a magnetic exchange field in Ni8Fe2 are the essential ingredients to generate a pure spin supercurrent channel in Nb. Here, by substituting Pt for a perpendicularly magnetized Pt/Co/Pt spin-sink, we are able to demonstrate the role of SOC, and show that pure spin supercurrent pumping efficiency across Nb is tunable by controlling the magnetization direction of Co. By inserting a Cu spacer with weak SOC between Nb and Pt/(Co/Pt) spin-sink, we also prove that Rashba type SOC is key for forming and transmitting pure spin supercurrents across Nb. Finally, by engineering these properties within a single multilayer structure, we demonstrate a prototype superconducting spin-wave (SW) device in which lateral SW propagation is gateable via the opening or closing of a vertical pure spin supercurrent channel in Nb.

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Kun-Rok Jeon, Xavier Montiel, Sachio Komori, Chiara Ciccarelli, James Haigh, Hidekazu Kurebayashi, Lesley F. Cohen, Chang-Min Lee, Mark G. Blamire, Jason W. A. Robinson. 2019-08-02. Tunable pure spin supercurrents and the demonstration of a superconducting spin-wave device. https://doi.org/10.1103/physrevx.10.031020

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