Nonequilibrium magnonic thermal transport engineering
arxiv(2024)
Abstract
Thermal conductivity, a fundamental parameter characterizing thermal
transport in solids, is typically determined by electron and phonon transport.
Although other transport properties including electrical conductivity and
thermoelectric conversion coefficients have material-specific values, it is
known that thermal conductivity can be modulated artificially via phonon
engineering techniques. Here, we demonstrate another way of artificially
modulating the heat conduction in solids: magnonic thermal transport
engineering. The time-domain thermoreflectance measurements using ferromagnetic
metal/insulator junction systems reveal that the thermal conductivity of the
ferromagnetic metals and interfacial thermal conductance vary significantly
depending on the spatial distribution of nonequilibrium spin currents.
Systematic measurements of the thermal transport properties with changing the
boundary conditions for spin currents show that the observed thermal transport
modulation stems from magnon origin. This observation unveils that magnons
significantly contribute to the heat conduction even in ferromagnetic metals at
room temperature, upsetting the conventional wisdom that the thermal
conductivity mediated by magnons is very small in metals except at low
temperatures. The magnonic thermal transport engineering offers a new principle
and method for active thermal management.
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