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Applying a magnetic field to a solid changes its thermal-transportproperties. Although such magneto-thermal-transport phenomena are usually smalleffects, giant magneto-thermal resistance has recently been observed inspintronic materials1,2 and superconductors3,4, opening up new possibilities inthermal management technologies. However, the thermal conductivityconventionally changes only when a magnetic field is applied due to the absenceof nonvolatility, which limits potential applications of thermal switchingdevices5,6. Here, we report the observation of nonvolatile thermal switchingthat changes the thermal conductivity when a magnetic field is applied andretains the value even when the field is turned off. This unconventionalmagneto-thermal switching, surprisingly, arises in commercial Sn-Pb solders andis realized by phase-separated superconducting states and resultant nonuniformmagnetic flux distributions. This result confirms the versatility of theobserved phenomenon and aids the development of active solid-state thermalmanagement devices.

Observation of nonvolatile magneto-thermal switching in superconductors