[14a-A501-1~13] 10.2 スピン基盤技術・萌芽的デバイス技術

▲ [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.)

キーワード：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.