Magnetic field dependence of the magnon spin diffusion length in the magnetic insulator yttrium iron garnet

Abstract

Diffusive transport of magnons in YIG has recently attracted a lot of research attention, particularly in the context of the spin Seebeck effect and the new field of magnon spintronics. Here, the authors perform a systematic study of the influence of an external magnetic field on the magnon spin diffusion length, making use of a nonlocal measurement scheme that allows for direct extraction of this length scale. The results demonstrate a new mechanism for the manipulation of diffusive magnonic spin currents.