Realizing Long\nMagnon Diffusion in Organic–Inorganic\nHybrid Perovskite Film by the Universal Isotope Effect

Organic–inorganic halide perovskite (OIHP) spintronics\nhas\nbecome a promising research field, as it provides a new precisely\nmanipulable degree of freedom. Recently, by utilizing the spin Seebeck\neffect and inverse spin-Hall effect measurements, we have discovered\nsubstantial magnon injection and transport in Pt/OIHP/Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> nonlocalized structure. In theory, hyperfine\ninteraction (HFI) is considered to have an important role in the magnon\ntransport of OIHP, but there is no clear experimental evidence reported\nso far. We report increased spin Seebeck coefficient and lengthened\nmagnon diffusion length in deuterated- (D-) OIHP films that have weaker\nHFI strength compared with protonated- (H-) OIHP. Consequently, D-MAPbBr<sub>3</sub> film, as a non-ferromagnetic spacer, achieves long magnon\ndiffusion length at room temperature (close to 120.3 nm). Our finding\nprovides valuable insights into understanding magnon transport in\nOIHP films and paves the way for the use of OIHPs in multifunctional\napplications.