We demonstrate the injection and detection of electrically and thermally generated spin currents probed in Co2MnSi/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 Co2MnSi 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.
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24 August 2015
Research Article|
August 24 2015
Spin currents injected electrically and thermally from highly spin polarized Co2MnSi
Alexander Pfeiffer;
Alexander Pfeiffer
1Institut für Physik,
Johannes Gutenberg-Universität Mainz
, 55099 Mainz, Germany
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Shaojie Hu;
Shaojie Hu
2Research Center for Quantum Nano-Spin Sciences,
Kyushu University
, 6-10-1 Hakozaki, Fukuoka 812-8581, Japan
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Robert M. Reeve;
Robert M. Reeve
1Institut für Physik,
Johannes Gutenberg-Universität Mainz
, 55099 Mainz, Germany
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Alexander Kronenberg;
Alexander Kronenberg
1Institut für Physik,
Johannes Gutenberg-Universität Mainz
, 55099 Mainz, Germany
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Martin Jourdan;
Martin Jourdan
1Institut für Physik,
Johannes Gutenberg-Universität Mainz
, 55099 Mainz, Germany
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Takashi Kimura;
Takashi Kimura
2Research Center for Quantum Nano-Spin Sciences,
Kyushu University
, 6-10-1 Hakozaki, Fukuoka 812-8581, Japan
3Department of Physics,
Kyushu University
, 6-10-1 Hakozaki, Fukuoka 812-8581, Japan
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Mathias Kläui
Mathias Kläui
a)
1Institut für Physik,
Johannes Gutenberg-Universität Mainz
, 55099 Mainz, Germany
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a)
Electronic mail: [email protected]
Appl. Phys. Lett. 107, 082401 (2015)
Article history
Received:
May 19 2015
Accepted:
August 06 2015
Citation
Alexander Pfeiffer, Shaojie Hu, Robert M. Reeve, Alexander Kronenberg, Martin Jourdan, Takashi Kimura, Mathias Kläui; Spin currents injected electrically and thermally from highly spin polarized Co2MnSi. Appl. Phys. Lett. 24 August 2015; 107 (8): 082401. https://doi.org/10.1063/1.4929423
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