1. Low temperature spin relaxation length exceeding 3 μm in highly conductive copper channels.
- Author
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Shen, Xingyu and Ji, Yi
- Subjects
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COPPER , *METALS at low temperatures , *LOW temperatures , *ELECTRIC conductivity , *CRYSTAL grain boundaries - Abstract
Despite extensive studies of spin transport in metallic structures, it remains a challenge to achieve spin relaxation length well above 1 μm in metals even at low temperatures. We explore nonlocal spin transport in Cu channels with a cross section of 0.5 × 0.5 μm2, which exhibit superior values of electrical conductivity and residual resistivity ratio (RRR). Based on structures fabricated in a single batch, we found an average spin relaxation length of λ C u = 3.2 ± 0.7 μ m and an average spin relaxation time of τs = 120 ± 50 ps at 30 K. Substantial variations of λ C u , RRR, and resistivity ρ C u are found among the structures and the three quantities correlate well to one another. The most conductive Cu channel in the batch yields λ C u = 5.3 ± 0.8 μ m and τ s = 250 ± 80 ps. These superior values exceed expectations for metals and can be attributed to reduced spin relaxation from grain boundaries and surfaces. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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