Spin Currents injected electrically and thermally from highly spin polarized Co${}_2$MnSi

Abstract

We demonstrate the injection and detection of electrically and thermally generated spin currents probed in Co${}_2$MnSi/Cu lateral spin valves. Devices with different electrode separations are patterned to measure the non-local signal as a function of the electrode spacing and we determine a relatively high effective spin polarization $\alpha$ of Co${}_2$MnSi to be 0.63 and the spin diffusion length of Cu to be 500 nm at room temperature. The electrically generated non-local signal is measured as a function of temperature and a maximum signal is observed for a temperature of 80 K. The thermally generated non-local signal is measured as a function of current density and temperature in a second harmonic measurement detection scheme. We find different temperature dependences for the electrically and thermally generated non-local signals, which allows us to conclude that the temperature dependence of the signals is not just dominated by the transport in the Cu wire, but that there is a crucial contribution from the different generation mechanisms, which has been largely disregarded to date.

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Cited by in corpus (5)

• Interface-Induced Phenomena in Magnetism
• Thermal spin injection and interface insensitivity in permalloy/aluminum metallic non-local spin valves
• Thermal effects in spintronic materials and devices: an experimentalist's guide
• Revealing the importance of interfaces for pure spin current transport
• Formation of Mn-rich interfacial phases in Co2FexMn1-xSi thin films