Tunable pure spin supercurrents and the demonstration 3 of their gateability in a spin-wave device - Jeon, K-R; Montiel, X; Komori, S; Ciccarelli, C; Haigh, J; Kurebayashi, H; Cohen, L; Chan, AK; Stenning, KD; Lee, C-M; Blamire, MG; Robinson, JWA (Physical Review X, 2020)