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RESEARCH PRODUCT

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

Mathias KläuiAlexander KronenbergTakashi KimuraA PfeifferRobert M. ReeveMartin JourdanShaojie Hu

subject

PhysicsPhysics and Astronomy (miscellaneous)Spin polarizationCondensed Matter - Mesoscale and Nanoscale PhysicsFOS: Physical sciences02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesMolecular physicsSignalMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesElectrodeSpin diffusionHarmonic010306 general physics0210 nano-technologySpin (physics)Current density

description

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.

yearjournalcountryeditionlanguage
2015-08-24
10.1063/1.4929423http://arxiv.org/abs/1507.04868