Variations of magnetic aftereffect and positron lifetime in an amorphous ferromagnetic alloy annealed at different temperatures

• Published in: Journal of magnetism and magnetic materials 1985-03, Vol.49 (1-2), p.189-194
• Main Authors: ALLIA, P, VINAI, F, DUPASQUIER, A, XIONG, L. Y, FERRO MILONE, A, SOARDO, G. P
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Domain effects, magnetization curves, and hysteresis; Exact sciences and technology; Magnetic properties and materials; Materials science; Metals, semimetals and alloys; Other topics in magnetic properties and materials; Physics; Specific materials
• ISSN: 0304-8853
• DOI: 10.1016/0304-8853(85)90120-9

The changes of magnetic permeability aftereffect effect and positron lifetime were measured at room temp. on the amorphous alloy Fe sub 67 Co sub 18 B sub 14 Si sub 1 after annealing at temp. in the range 100-375 deg C. After high-temp. treatments, a strong reduction (up to 90%) of the magnetic aftereffect was observed, while the positron lifetime was found to be reduced to approx 10% of the difference between the values typical of amorphous and crystalline metals, respectively. The present results suggest that a condition for a high value of the room temp. magnetic aftereffect is the presence, in as cast ribbons, of open spaces favoring the mobility of anisotropic defects interacting with the magnetization. This microscopic free-volume is partially suppressed by annealing, reasonably explaining the strong reduction of the aftereffect. 24 ref.--AA