Curvature-enhanced Spin-orbit Coupling and Spinterface Effect in Fullerene-based Spin Valves

Scientific Reports
Shiheng LiangTho D Nguyen

Abstract

We investigated curvature-enhanced spin-orbit coupling (SOC) and spinterface effect in carbon-based organic spin valves (OSVs) using buckyball C60 and C70 molecules. Since the naturally abundant (12)C has spinless nuclear, the materials have negligible hyperfine interaction (HFI) and the same intrinsic SOC, but different curvature SOC due to their distinct curvatures. We fitted the thickness dependence of magnetoresistance (MR) in OSVs at various temperatures using the modified Jullière equation. We found that the spin diffusion length in the C70 film is above 120 nm, clearly longer than that in C60 film at all temperatures. The effective SOC ratio of the C70 film to the C60 film was estimated to be about 0.8. This was confirmed by the magneto-electroluminescence (MEL) measurement in fullerene-based light emitting diodes (LED). Next, the effective spin polarization in C70-based OSVs is smaller than that in C60-based OSVs implying that they have different spinterface effect. First principle calculation study shows that the spin polarization of the dz(2) orbital electrons of Co atoms contacted with C60 is larger causing better effective spin polarization at the interface.

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Citations

Apr 5, 2018·Scientific Reports·Srijani MallikSubhankar Bedanta
Jan 27, 2019·Advanced Materials·Lidan GuoXiangnan Sun
Oct 7, 2016·Advanced Materials·Shiheng LiangYuan Lu
Jul 6, 2019·Frontiers in Chemistry·Lidan GuoXiangnan Sun
Nov 17, 2020·Frontiers in Chemistry·Yixiao ZhangXiangnan Sun

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Methods Mentioned

BETA
electron paramagnetic resonance

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