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. 
- Martin, Thomas Commerford; Wetzler, Joseph (1891). The electric motor and its applications. New York: W. J. Johnston. pp. 272–278.
- Post, Alexander; Knight, Chris; Kisi, Erich (2013). "Thermomagnetic energy harvesting with first order phase change materials". Journal of Applied Physics 114. doi:10.1063/1.4815933. Retrieved 12 August 2015.
- Smart Materials Structures of Systems Allied Publishers ISBN 8170239583 page 23-25
- Von Tunzelmann, George William (1902). Electricity in modern life. New York: P. F. Collier & Son. pp. 383–388.
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