We investigated the spin Hall effect (SHE) in amorphous YPt alloy. In amorphous YPt thin films with various resistivity and thickness, we observed strong sensitivity of the effective spin Hall angle to resistivity, which was found to be governed by the intrinsic mechanism with large intrinsic spin Hall conductivity of 700100 Ω⁻¹cm⁻¹ and the extrinsic side-jump mechanism with opposite polarity. Despite the amorphous nature, the measured spin relaxation length in YPt is 0.9 nm, which is longer than that expected for crystallized Pt-based alloys with the same resistivity. Our results highlight the importance of the intrinsic mechanism to the SHE in amorphous alloys.

我们研究了非晶 YPt 合金的自旋霍尔效应 (SHE)。在具有各种电阻率和厚度的非晶 YPt 薄膜中，我们观察到有效自旋霍尔角对电阻率的强烈敏感性，发现这是由具有 700100 Ω ^-1 cm ^{-1 的}大本征自旋霍尔电导率的本征机制控制的，并且具有相反极性的外在侧跳机制。尽管具有非晶性质，但在 YPt 中测得的自旋弛豫长度为 0.9 nm，这比具有相同电阻率的结晶 Pt 基合金的预期长度要长。我们的结果强调了非晶合金中 SHE 内在机制的重要性。