| Numéro |
J. Phys. Colloques
Volume 42, Numéro C5, Octobre 1981
ICIFUAS-7Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids |
|
|---|---|---|
| Page(s) | C5-647 - C5-652 | |
| DOI | https://doi.org/10.1051/jphyscol:1981599 | |
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-647-C5-652
DOI: 10.1051/jphyscol:1981599
MAGNETIC RELAXATIONS IN AMORPHOUS FERROMAGNETIC Fe80-xNixP20-yBy ALLOYS
N. Moser, H. Kronmüller et W. FrankMax-Planck-Institut für Metallforschung, Institut für Physik, and Universität Stuttgart, Institut für Theoretische und Angewandte Physik, Stuttgart, F.R.G.
Abstract
The magnetic after-effect spectra and their annealing behaviour were measured on Fe80-xNixP20-yBy alloys between 4.2 K and 520 K. Three relaxations were observed : (A) a relaxation with an almost temperature-independent amplitude between 4.2 K and 300 K, ( B ) a broad relaxation peak which in Fe40Ni40P14B6 reaches from 350 K to 450 K and anneals out between room temperature and 500 K, (c) a relaxation maximum just below the Curie temperature Tc (provided Tc < 520 K). The relaxations are interpreted in terms of structural rearrangements in the amorphous state : Relaxation A is tentatively assigned to tunnelling-controlled rearrangements. To B two relaxation processes contribute : (B1) the reorientation of pairs of metal atoms in the vicinity of free volume, (B2) the jumping of metalloid atoms between sites located between two metal atoms.