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arXiv · 1502.05244

Spin-current injection and detection in strongly correlated organic conductor

Z. Qiu·M. Uruichi·D. Hou·K. Uchida·H. M. Yamamoto·E. Saitoh
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Abstract

Spin-current injection into an organic semiconductor $\rm{\kappa\text{-}(BEDT\text{-}TTF)_2Cu[N(CN)_2]Br}$ film induced by the spin pumping from an yttrium iron garnet (YIG) film. When magnetization dynamics in the YIG film is excited by ferromagnetic or spin-wave resonance, a voltage signal was found to appear in the $\rm{\kappa\text{-}(BEDT\text{-}TTF)_2Cu[N(CN)_2]Br}$ film. Magnetic-field-angle dependence measurements indicate that the voltage signal is governed by the inverse spin Hall effect in $\rm{\kappa\text{-}(BEDT\text{-}TTF)_2Cu[N(CN)_2]Br}$. We found that the voltage signal in the $\rm{\kappa\text{-}(BEDT\text{-}TTF)_2Cu[N(CN)_2]Br}$/YIG system is critically suppressed around 80 K, around which magnetic and/or glass transitions occur, implying that the efficiency of the spin-current injection is suppressed by fluctuations which critically enhanced near the transitions.

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Z. Qiu, M. Uruichi, D. Hou, K. Uchida, H. M. Yamamoto, E. Saitoh. 2015-02-13. Spin-current injection and detection in strongly correlated organic conductor. https://doi.org/10.1063/1.4922007

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