Abstract
Experiments measure, for the first time, two distinct contributions to the spin current in a magnetic insulator as well as the nonequilibrium magnon chemical potential, insight that can inform the development of spin-based technologies.
Highlights
Magnetic insulators (MIs) provide a unique model system for exploring nonequilibrium phenomena and developing spintronic applications [1,2,3]
Evaluating the magnon nonequilibrium begins with determining the phonon temperature
There are several valuable insights to be drawn from these results
Summary
Magnetic insulators (MIs) provide a unique model system for exploring nonequilibrium phenomena and developing spintronic applications [1,2,3]. What is appealing to both fields is the fact that properties of MIs are determined by only two subsystems, i.e., two types of collective excitations: phonons and magnons, leading to longer energy and spin relaxation times or lengths than those in metallic systems. Thermally driven nonequilibria and the interplay between these phonons and magnons result in a broad range of newly discovered spin caloritronic phenomena, such as the spin Seebeck effect [4,5,6].
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