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Title: Spin currents injected electrically and thermally from highly spin polarized Co{sub 2}MnSi

We demonstrate the injection and detection of electrically and thermally generated spin currents probed in Co{sub 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 α of Co{sub 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 there is a crucial contribution from the different generation mechanisms, which has been largely disregarded till date.
Authors:
; ; ; ;  [1] ;  [2] ;  [2] ;  [3]
  1. Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz (Germany)
  2. Research Center for Quantum Nano-Spin Sciences, Kyushu University, 6-10-1 Hakozaki, Fukuoka 812-8581 (Japan)
  3. (Japan)
Publication Date:
OSTI Identifier:
22489160
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CURRENT DENSITY; CURRENTS; DIFFUSION LENGTH; SIGNALS; SPIN; SPIN ORIENTATION; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0273-0400 K; VALVES; WIRES