Ferrofluid based reversible thermal interfaces

A thermal switch regulates the heat flux by switching the thermal conductance of two-terminal components in "on" and "off" states [P. Hu and J. Wang, Device 1, 100095 (2023)]. We present a novel ferrofluid-based reversible thermal switch that modulates thermal conductance by formation and breakup of ferrofluid bridge between two surfaces using a periodic magnetic field. The lifetime of the bridge is controlled by adjusting the "switch on" and "switch off" times of the electromagnet. Heat is tran