Local heat emission due to unidirectional spin-wave heat conveyer effect observed by lock-in thermography

TL;DR

This study uses lock-in thermography to visualize and analyze the local heat emission caused by the unidirectional spin-wave heat conveyer effect in yttrium iron garnet, revealing edge dynamics and long-range energy transfer capabilities.

Contribution

It provides the first direct visualization of heat source distribution due to USHCE and demonstrates remote heating through air gaps via long-range dipole interactions.

Findings

Spatially biased heating patterns observed

Edge spin-wave dynamics are crucial for USHCE

Remote heating through air gaps demonstrated

Abstract

Lock-in thermography measurements were performed to reveal heat source distribution induced by the unidirectional spin-wave heat conveyer effect (USHCE) of magnetostatic surface spin waves. When the magnetostatic surface spin waves are excited in an yttrium iron garnet slab, the lock-in thermography images show spatially biased sharp and complicated heating patterns, indicating the importance of edge spin-wave dynamics for USHCE. The accessibility to the local heat emission properties allows us to clarify a capability of remote heating realized by USHCE; it can transfer energy for heating even through a macro-scale air gap between two magnetic materials owing to the long-range dipole-dipole coupling.