The spin-heat coupling and enabling applications

Phonons and magnons, which are respectively quanta of lattice vibrations and spin dynamics, are both bosonic quasi-particles and constitute two fundamental collective excitations in condensed-matter physics. The fundamental physics of spin-heat coupling via the interactions between magnons and phonons have attracted much attention in recent years among both experimental and theoretical physicists, given its promising applications in the fields of energy, data storage, and spintronics. In this perspective, we highlight the impacts of magnon–phonon interactions on the thermal and magnetic transport properties of various magnetic materials. Several representative applications will also be discussed as the enabling techniques resulting from such interwoven transport phenomena, including metrology development, magnon contributions to thermal transport and storage, and temperature-dependent magnetic dynamics for recording and spintronic applications.