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has anyone ever heard of a magnetic material that increases in size as it heats, and shrinks when used in a generator to create electricity, therefore partially transducing heat to electricity?

I’ve not heard of such any generator built using this approach, and don’t imagine that anything so complicated would be useful compared to the many heat engine (eg: steam turbines) and direct thermoelectric generators already in widespread use.

 

An important point to be mindful of is that nothing can transduce uniform heat into mechanical energy. That would violate the laws of thermodynamics. To generate mechanical energy, including electricity, from heat, a device must have access to a heat difference.

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