Journal
NATURE PHYSICS
Volume 11, Issue 7, Pages 576-U87Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS3355
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Funding
- Army Research Office MURI [W911NF-14-1-0016]
- KIST institutional program
- Pioneer Research Center Program of MSIP/NRF [2011-0027905]
- National Research Foundation of Korea (NRF) grant - Korea government (MSIP) [NRF-2013R1A2A2A01013188]
- KU-KIST Graduate School of Converging Science and Technology Program
- Ministry of Science, ICT & Future Planning, Republic of Korea [2E25450] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2013R1A2A2A01013188, 2011-0027905] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 effect (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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