期刊
PHYSICAL REVIEW B
卷 93, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.93.064418
关键词
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资金
- US DOE-BES [DE-SC0012190]
- U.S. Department of Energy (DOE) [DE-SC0012190] Funding Source: U.S. Department of Energy (DOE)
Thermally driven spin-transfer torques have recently been reported in electrically insulating ferromagnet|normal-metal heterostructures. In this paper, we propose two physically distinct mechanisms for such torques. The first is a local effect: out-of-equilibrium, thermally activated magnons in the ferromagnet, driven by a spin Seebeck effect, exert a torque on the magnetization via magnon-magnon scattering with coherent dynamics. The second is a nonlocal effect which requires an additional magnetic layer to provide the symmetry breaking necessary to realize a thermal torque. The simplest structure in which to induce a nonlocal thermal torque is a spin valve composed of two insulating magnets separated by a normal metal spacer; there, a thermal flux generates a pure spin current through the spin valve, which results in a torque when the magnetizations of the layers are misaligned.
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