Direct evidence for suppression of the Kondo effect due to pure spin current

We study the effect of a pure spin current on the Kondo singlet in a diluted magnetic alloy using nonlocal lateral spin valve structures with highly spin polarized Co2FeSi electrodes. Temperature dependence of the nonlocal spin signals shows a sharp reduction with decreasing temperature, followed by...

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Bibliographic Details
Published in:Physical review. B 2016-10, Vol.94 (14), p.140401(R), Article 140401
Main Authors: Hamaya, K., Kurokawa, T., Oki, S., Yamada, S., Kanashima, T., Taniyama, T.
Format: Article
Language:English
Subjects:
Accumulation
Diffusion length
Fermi liquids
Kondo effect
Kondo temperature
Magnetic alloys
Spin valves
Spintronics
Temperature dependence
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Summary:We study the effect of a pure spin current on the Kondo singlet in a diluted magnetic alloy using nonlocal lateral spin valve structures with highly spin polarized Co2FeSi electrodes. Temperature dependence of the nonlocal spin signals shows a sharp reduction with decreasing temperature, followed by a plateau corresponding to the low temperature Fermi liquid regime below the Kondo temperature (TK). The spin diffusion length of the Kondo alloy is found to increase with increasing spin accumulation. The results are in agreement with the intuitive description that the Kondo singlet cannot survive any more in sufficiently large spin accumulation even below TK.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.94.140401