I am unsure about that , from what i get as long as there is a piece of metal that has magnetic field being changed constantly trough it , it should cool itself. That said if there is a pipe for example and few magnets with different polarities, and liquid going through the Gadolinium and cooling a heatsink that is a water-cooler, that could in theory keep it close and just under sub ambient temperature. Should - excuse me for te english , is not my native language