Spin Seebeck effect detection by harmonic analysis (original) (raw)

We present an alternative measurement technique for the longitudinal spin Seebeck effect (SSE), based on harmonic analysis of the signal measured in the Y 3 Fe 5 O 12 =Pt bilayer. In our experimental setup, we use a harmonic magnetic field and a static thermal gradient in the longitudinal configuration to induce a square-wave SSE signal. By using a phase-sensitive detection technique (lock-in), we can reduce the impact of electrical noise, which improves sensitivity and, through harmonic analysis of the measured signal, decouples in real time the SSE signal from other thermoelectric effects.