Amorphous magnetic materials Magnetocaloric effect Nanocrystalline materials Curie temperature
Issue Date:
2007
Publisher:
Materials Science and Engineering A
Citation:
Volume: 448-451, Page : 360-363
Abstract:
A large number of amorphous ribbons based on Finemet have been prepared by rapid quenching
on a single copper wheel with linear speed of v = 25-30 m/s. The ribbons are 20-25 ?m thick and 6-8 mm
wide. All as-cast samples are amorphous. Two criteria producing the colossal magnetocaloric effect
(CMCE) in magnetic materials working as magnetic refrigerants are high saturation magnetization and sharp
ferromagnetic-paramagnetic phase transition. The Fe-based amorphous ribbons fit these cretia.
Thermomagnetic curves as well as isothermal magnetization curves around the Curie temperature of all the
studied samples have been determined. The results show that the magnetic entropy change, |??Sm|, belongs
to a class of materials with CMCE and the |??Sm|max values have been obtained at a moderately low
magnetic field change of 1.35 T, moreover |??Sm|max occurred at quite high temperature. ?? 2006 Elsevier
B.V. All rights reserved.
