The magnetic properties of devitrified amorphous Fe80B20 ribbons have been studied by Mossbauer spectroscopy and magnetization measurements. The mean magnetic hyperfine field of the interfacial structural components has been found to be higher in nanocrystalline samples than in microcrystalline ones: this effect is ascribed to the epitaxial growth of small clusters of bcc Fe, with topological disorder, on Fe3B during annealing, producing nanocrystalline structures. The interfacial components present large topological disorder with three kinds of chemical short-range order. Magnetization measurements show larger hysteresis loops after heat treatment, indicating the formation of magnetic phases with higher anisotropy.
Magnetic properties of Fe80B20 alloys with nanocristalline structures
RONCONI, Franco;
1994
Abstract
The magnetic properties of devitrified amorphous Fe80B20 ribbons have been studied by Mossbauer spectroscopy and magnetization measurements. The mean magnetic hyperfine field of the interfacial structural components has been found to be higher in nanocrystalline samples than in microcrystalline ones: this effect is ascribed to the epitaxial growth of small clusters of bcc Fe, with topological disorder, on Fe3B during annealing, producing nanocrystalline structures. The interfacial components present large topological disorder with three kinds of chemical short-range order. Magnetization measurements show larger hysteresis loops after heat treatment, indicating the formation of magnetic phases with higher anisotropy.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.