Spin-current injection and detection in strongly correlated organic conductor

Abstract

Spin-current injection into an organic semiconductor $\kappa \text{-}(\mathrm{BEDT}\text{-}\mathrm{TTF}{)}_2\mathrm{Cu}[\mathrm{N}(\mathrm{CN}{)}_2]\mathrm{Br}$ 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 $\kappa \text{-}(\mathrm{BEDT}\text{-}\mathrm{TTF}{)}_2\mathrm{Cu}[\mathrm{N}(\mathrm{CN}{)}_2]\mathrm{Br}$ film. Magnetic-field-angle dependence measurements indicate that the voltage signal is governed by the inverse spin Hall effect in $\kappa \text{-}(\mathrm{BEDT}\text{-}\mathrm{TTF}{)}_2\mathrm{Cu}[\mathrm{N}(\mathrm{CN}{)}_2]\mathrm{Br}$. We found that the voltage signal in the $\kappa \text{-}(\mathrm{BEDT}\text{-}\mathrm{TTF}{)}_2\mathrm{Cu}[\mathrm{N}(\mathrm{CN}{)}_2]\mathrm{Br}$/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.

References in corpus (3)

• Unconventional critical behaviour in a quasi-two-dimensional organic conductor
• Enhanced DC Spin Pumping into a Fluctuating Ferromagnet near Tc
• Bandwidth-controlled Mott transition in $\kappa -(BEDT-TTF{)}_{2}Cu[N(CN{)}_2]B{r}_{x}C{l}_{1-x}$ I. Optical studies of localized charge excitations

Cited by in corpus (7)

• Spin current generation in organic antiferromagnets
• Spin-current probe for phase transition in an insulator
• Measurement of spin pumping voltage separated from extrinsic microwave effects
• Spin pumping into superconductors: A new probe of spin dynamics in a superconducting thin film
• Electron spin dynamics of two-dimensional layered materials
• Spin pumping into a spin glass material
• Effective spin Hall properties of a mixture of materials with and without spin-orbit coupling: Tailoring the effective spin-diffusion length