Thermo-magnetic motors convert heat into mechanical work by heating a ferromagnetic material above its Curie point (where it becomes non-magnetic) and then cooling it below that critical temperature. Experiments have only produced extremely inefficient working prototypes.  The thermo-magnetic motor principle has been studied as a possible actuator in so-called "smart" materials. 
- Von Tunzelmann, George William (1902). Electricity in modern life. New York: P. F. Collier & Son. pp. 383–388.
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