pyromagnetic
/ˌpʌɪrə(ʊ)maɡˈnɛtɪk/adjective
1 Electrical Engin. Designating a type of dynamo (invented by Thomas Edison) which utilized the fact that the magnetizability of iron decreases with increasing temperature. Now historical.
2 Physics. Of, relating to or exhibiting pyromagnetism.
Origin
Late 19th century; earliest use found in The Times. From pyro- + magnetic.