Thermal spin-transfer torque driven by the spin-dependent Seebeck effect in metallic spin-valves
- Thermal spin-transfer torque driven by the spin-dependent Seebeck effect in metallic spin-valves
- 최경민; 문철현; 민병철; 이경진; David G. Cahill
- Issue Date
- Nature physics
- VOL 11, 576-581
- The coupling of spin and heat gives rise to new physical phenomena in nanoscale spin devices. In particular, spin-transfer torque (STT) driven by thermal transport provides a new way to manipulate local magnetization.We quantify thermal STT in metallic spin-valve structures using an intense and ultrafast heat current created by picosecond pulses of laser light. Our result shows that thermal STT consists of demagnetization-driven and spin-dependent Seebeck e ect (SDSE)-driven components; the SDSE-driven STT becomes dominant after 3 ps. The sign and magnitude of the SDSE-driven STT can be controlled by the composition of a ferromagnetic layer and the thickness of a heat sink layer.
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