Abstract
Ferromagnetic amorphous samples of Fe81B13.5Si3.5C2 were exposed isochronally to pulsed radio frequency (rf) annealing (vrf=54.8 MHz, τpulse=0.1 s) by employing field strengthsHrfwhich ranged from 3–12 Oe. Conversion electron Mossbauer spectra (CEMS) were analyzed in terms of the rf energy dependence of magnetic hyperfine field (HF) distribution. For field strengthsHrf>6 Oe, CEMS spectra of the rf annealed samples showed an additional quadrupole splitting (QS) distribution, which was assigned to FeSi clusters. The relative areal intensity of the QS distribution, linearly dependent on the rf field energy, is proposed as an appropriate order parameter for the onset of compositional short-range order (CSRO). An activation energy of 1.7 eV is estimated for the onset of surface CSRO in the rf annealed FeBSiC system.
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