Highly thermal-stable ferromagnetism by a natural composite.All ferromagnetic materials show deterioration of magnetism-related properties such as magnetization and magnetostriction with increasing temperature, as the result of gradual loss of magnetic order with approaching Curie temperature TC.  Here we show that a Fe-Ga alloy exhibits highly thermal-stable magnetization up to the vicinity of its TC, 880 K. Also, the magnetostriction shows nearly no deterioration over a very wide temperature range.  Our finding may help to develop highly thermal-stable ferromagnetic and magnetostrictive materials.
THERM