Temperature dependence of magneto-transport properties in Co2Fe(Ga0.5Ge0.5)/Cu lateral spin valves

Ikhtiar, S. Kasai, Y. K. Takahashi, T. Furubayashi, S. Mitani, K. Hono

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The non-local spin signals of Co2Fe(Ga0.5Ge0.5)/Cu lateral spin valves with sub-micron size dimensions were measured with varying temperatures. The non-local spin signal reaches 54 mΩ at 4 K, while it degrades down to 13 mΩ at room temperature. Analysis based on the one-dimensional spin diffusion model clarifies the dominant source for degrading of the spin signal is suppression of the spin diffusion length in Cu, not the spin polarization, indicating Co2Fe(Ga0.5Ge0.5) keeps half-metallic nature even at room temperature. The temperature dependence of non-local spin signal was found to exhibit a downturn at 36 K. The presence of magnetic impurities, detrimental effect of which becomes more pronounced for diffusive transport in long Cu wires, is suggested to cause the observed downturn in non-local spin signals.

Original languageEnglish
Article number062401
JournalApplied Physics Letters
Volume108
Issue number6
DOIs
Publication statusPublished - 2016 Feb 8
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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