  The duality between electric and magnetic dipoles in electromagnetism only
partly applies to condensed matter. In particular, the elementary excitations
of the magnetic and ferroelectric orders, namely magnons and ferrons,
respectively, have received asymmetric attention from the condensed matter
community in the past. In this perspective, we introduce and summarize the
current state of the budding field of "ferronics" and speculate about its
potential applications in thermal, information, and communication technology.
