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MA: Fachverband Magnetismus

MA 35: Spin dependent Transport Phenomena

MA 35.3: Talk

Wednesday, March 9, 2016, 15:30–15:45, H33

Spin currents injected electrically and thermally from highly spin polarized Co₂MnSi — •Alexander Pfeiffer^1,2, Shaojie Hu³, Robert M. Reeve¹, Alexander Kronenberg¹, Martin Jourdan¹, Takashi Kimura^3,4, and Mathias Kläui^1,2 — ¹Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany — ²Graduate School of Excellence Materials Science in Mainz, Mainz, Germany — ³Research Center for Quantum Nano-Spin Sciences, Kyushu University, Fukuoka, Japan — ⁴Department of Physics, Kyushu University, 6-10-1 Hakozaki, Fukuoka 812-8581, Japan

We demonstrate the injection and detection of electrically and thermally generated spin currents in Co₂MnSi/Cu lateral spin valves. Devices with different electrode separations are patterned to measure the non-local signal as a function of the spacing and we determine a high spin polarization of the injected spins of 0.63 and the spin diffusion length in Cu is 500 nm. The electrically generated non-local signal is measured as a function of temperature with a maximum 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 there is a crucial contribution from the different generation mechanisms, which has been largely disregarded till date. A. Pfeiffer et al., Appl. Phys. Lett. 107, 082401 (2015)