Heavy-metal (HM)/magnet bilayers host many magnetoresistance (MR) and spin caloritronic effects. Here, we show that the spin Peltier effect and electron-phonon scattering produce much larger unidirectional MR of an HM on a magnetic insulator than existing theories that neglect the interplay between MR and spin caloritronic effects. By accounting for local nonequilibrium in both the magnon chemical potential and temperature, our analytical model attributes the observed frequency dependence of the spin Peltier MR and the spin Seebeck effect to the reduction of the thermal penetration depth, which approaches the $1\text{−}\mu \mathrm{m}$-scale magnon spin-diffusion length at high frequencies.

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• Magnetic anisotropy
• Magnetotransport
• Spin dynamics
• Spintronics
• Temperature
• Thermal conductivity
• Thermoelectric effects
• Thermomagnetic effects