Fig. 2: Thermal imaging of spin Peltier effect.
From: Large spin-Hall effect in non-equilibrium binary copper alloys beyond the solubility limit
a Concept of the spin-Hall effect (SHE)-induced spin Peltier effect (SPE). For the present Cu–Ir/YIG junction, the SHE in Cu–Ir converts the charge current (Jc) into the spin current (Js). The Js interacts with magnetization (M) of YIG, which results in the heat current (Jq) flow across the Cu–Ir/YIG junction. b Illustration of device for the SPE measurement, which consists of two wires with the width of 0.4 mm. The position in the device was denoted by yD. c Lock-in thermography (LIT) conditions for the SPE and d Joule heating measurements. e Amplitude (ASPE) and phase (ϕSPE) images of SPE-induced temperature modulation for t = 30 nm at Jc = 10 mA with the lock-in frequency (f) of 25 Hz. These images were obtained by using the images at the external magnetic field (Bext) of 0.1 and −0.1 T, where Bext was applied along the in-plane x direction, in order to exact the Bext-odd component. f Amplitude (AJoule) and phase (ϕJoule) images of Joule-heating-induced temperature modulation for t = 30 nm at Jc0 = 1 mA and ΔJc = 1 mA with f = 25 Hz. Bext was not applied. g ASPE and h AJoule as a function of yD in the left Cu–Ir wire with t = 30 nm at f = 25 Hz. These line profiles were obtained by averaging the data points in the 0.2 mm-wide central region of the wire. i Resistivity (ρ) of Cu–Ir wire with t = 30 nm as a function of yD.
