Ferromagnetic Ln(Fe-4Sii-4)u compounds with xaO.87 show an itinerant metamagnetic transition above the Curie temperature Tc. Since a large volume change of about 1.5% is caused by the transition, the present compounds have a possibility for practical applications as giant magnetostrictive materials. To adjust Tc around room temperature, the effect of the substitution by other magnetic elements on the Curie temperature was examined. The Curie temperature of La(Fe,8gCoJ,Siolî.y)]3 compounds increases with increasing y and the itinerant electron metamagnetic transition appears above Tc. For y=0,03 and 0.04, a huge volume change of 0.6 ~0.9 %, or a linear change of 0.2 - 0.3%, due to the itinerant metamagnetic transition is observed around 250K.
- Giant volume magnetostriction
- Itinerant electron metamagnetic transition
- Substitution effect
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering