Phys.org  October 22, 2024 To realize magnonic devices, finding a way to make magnons better transport and efficiently pump their spin angular momentum across a ferromagnetic insulator (FMI)/normal metal interface is crucial. An international team of researchers (South Korea, Japan) found that modulating the magnon  temperature in the FMI led to significantly enhanced spin pumping. The modulation was achieved by careful interfacial engineering via a nanoscale thermal fin structure that strengthened the energy exchange between magnons and phonons across interfaces. Theoretical and experimental evidence coherently indicated that the observed enhancement was due to modified magnon temperature profile in the FMI. […]