Observation of Thermal Spin-Orbit Torque in W/CoFeB/MgO Structures.

Autor:	Kim JM; Department of Materials Science and Engineering, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea., Kim DJ; Department of Materials Science and Engineering, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea., Cheon CY; Department of Materials Science and Engineering, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea., Moon KW; Center for Nanometrology, Korea Research Institute of Standards and Science 267 Gajung-ro, Yuseong-gu, Daejeon, Korea, 34113, Republic of Korea., Kim C; Center for Nanometrology, Korea Research Institute of Standards and Science 267 Gajung-ro, Yuseong-gu, Daejeon, Korea, 34113, Republic of Korea., Cao Van P; Department of Materials Science and Engineering, Graduate School of Energy Science and Technology, Chungnam National University, Daejeon, 34134, Republic of Korea., Jeong JR; Department of Materials Science and Engineering, Graduate School of Energy Science and Technology, Chungnam National University, Daejeon, 34134, Republic of Korea., Hwang C; Center for Nanometrology, Korea Research Institute of Standards and Science 267 Gajung-ro, Yuseong-gu, Daejeon, Korea, 34113, Republic of Korea., Lee KJ; Department of Materials Science and Engineering, Korea University KU-KIST Graduate School of Converging Science and Technology, Korea University 145 Anam-ro, Anam-dong, Seongbuk-gu, Seoul, Korea, 02841, Republic of Korea.; Department of Physics, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea., Park BG; Department of Materials Science and Engineering, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
Jazyk:	angličtina
Zdroj:	Nano letters [Nano Lett] 2020 Nov 11; Vol. 20 (11), pp. 7803-7810. Date of Electronic Publication: 2020 Oct 15.
DOI:	10.1021/acs.nanolett.0c01702
Abstrakt:	Coupling of spin and heat currents enables the spin Nernst effect, the thermal generation of spin currents in nonmagnets that have strong spin-orbit interaction. Analogous to the spin Hall effect that electrically generates spin currents and associated electrical spin-orbit torques (SOTs), the spin Nernst effect can exert thermal SOTs on an adjacent magnetic layer and control the magnetization direction. Here, the thermal SOT caused by the spin Nernst effect is experimentally demonstrated in W/CoFeB/MgO structures. It is found that an in-plane temperature gradient across the sample generates a magnetic torque and modulates the switching field of the perpendicularly magnetized CoFeB. The W thickness dependence suggests that the torque originates mainly from thermal spin currents induced in W. Moreover, the thermal SOT reduces the critical current for SOT-induced magnetization switching, demonstrating that it can be utilized to control the magnetization in spintronic devices.
Databáze:	MEDLINE
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