Thermal Spin-Valve Effect in Magnetic Multi-layered Nanowires
We have investigated the influence of the spin-dependent scattering on the heat transports in NiFe/Cu/NiFe and Co/Cu/Co tri-layered nanowires. The thermal conductivity and its spin dependence for the tri-layered wires have been evaluated by using an integrated nano-sized thermo couple. We find that the thermal spin-valve effect is always approximately 8 times larger than the electrical spin-valve effect, namely giant magnetoresistance effect. The numerical simulation with the experimental results enable us to estimate the thermal conductivity for the tri-layered wire and its spin dependence. Surprisingly, the spin dependence of the thermal conductivity for the Co/Cu/Co wire is as high as 8%, which is much larger than the electrical one. This indicates a high potential application of the thermal spin-valve effect.
KeywordsSpin-dependent transport Heat transport Seebeck effect
This work was partially supported by Grant-in-Aid for Scientific Research on Innovative Area, “Nano Spin Conversion Science” (26103002), that for Scientific Research (A) (18H03866), that for Challenging Exploratory Research (17H06227), and JSPS Program for Fostering Globally Talented Researchers.
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