Verification of long-distance spin transport in spin liquid state using local excitation and detection of electron spin resonance

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We have verified that the local excitation of the spin states can be a spin current injector for high-resistivity materials, e.g., organic materials. We have also investigated the spin transport length of organic materials. As the first step, we have fabricated ferromagnet/organic junction using permalloy (Py) ferromagnet and PEDOT:PSS organic polymer, and then, performed spin pumping experiment. In this experiment, the spin states of organic layer is locally excited via exchange interaction at the Py/PEDOT:PSS interface. The transmitted spin current is detected by the inverse spin Hall effect of the Platinum (Pt) layer located at the opposite of the PEDOT:PSS film. The obtained spin diffusion length of PEDOT:PSS film is approximately 140 nm.