[14a-A501-1~13] 10.2 Fundamental and exploratory device technologies for spin

▲ [14a-A501-13] Spin Hall effect of non-equilibrium Cu-Ir binary alloy

Hiroto Masuda¹, Rajkumar Modak², 〇Takeshi Seki^1,2,3, Ken-ichi Uchida^1,2,3, Yong Chang Lau^1,3, Yuya Sakuraba^2,4, Ryo Iguchi², Koki Takanashi^1,3,5 (1.IMR, Tohoku Univ., 2.NIMS, 3.CSRN, Tohoku Univ., 4.JST PRESTO, 5.CSIS, Tohoku Univ.)

Keywords:spin Hall effect, Cu, combinatorial technique

We carried out a comprehensive study on the SHE of Cu-Ir binary alloys by exploiting a combinatorial technique based on the thermal imaging for a composition-spread film. We utilized the spin Peltier effect (SPE) as a probe of the spin-charge current conversion. From the thermal images originating from the SPE, we have found that the spin Hall efficiency is maximized at the composition of Cu₇₈Ir₂₂, which corresponds to the non-equilibrium Cu-Ir and is not thermodynamically stable in the bulk phase diagram. We also quantitatively analyzed the spin Hall efficiency for the Cu₇₈Ir₂₂/ Co bilayer. That quantative evaluation suggests that the non-equilibrium Cu-Ir alloy is a candidate of spin Hall material.