Thermo nagnetic generator

Proposals have been made to use the properties of ferromagnetic substances near the Curie point for constructing thermomagnetic current generators. Large flux variations could be induced in a coil and a.c. generated by heating and cooling above and below its Curie point a ferromagnetic substance forming part of a magnetic circuit. The mechanism lies in a temp. dependence of the permeability of the substance and the associated thermomagnetic effects. The magnitude of the effect and of the efficiencies obtainable are calculated.