Magnetocaloric effect Nanocrystalline alloy Nanoparticle Soft magnetic amorphous system
Issue Date:
2006
Publisher:
Journal of Magnetism and Magnetic Materials
Citation:
Volume: 304, Issue: 1
Abstract:
The amorphous ribbon Fe73.5Si13.5B9Nb3 Au1 has been prepared by rapid cooling on a copper
wheel. The ribbon is 16.8 ?m thick and 7 mm wide. The DSC curves show the first peak at 547-579 ?C
(corresponds to the crystallization of ?-Fe(Si) phase) depending on heating rate from 10 to 50 ?C/min which
is a little higher than that of pure Finemet (542-570 ?C, respectively). From the Kissinger plot, the
crystallization activation energy is determined and shown to be 2.8 eV for ?-Fe(Si) phase, less than that of
Finemet ( E = 3.25 eV). By annealing at 530 ?C for 30, 60 and 90 min, the crystallization volume fraction of
?-Fe(Si) phase increased from 73% to 78% and 84%, respectively. After appropriate annealing, the ultrasoft
magnetic properties are achieved. The maximum magnetic entropy change, {divides}??Sm{divides}max,
showed a giant value of 7.8 J/kg K which occurred at around Curie temperature of amorphous phase of the
ribbon. ?? 2006.
