MAGNETIC-STRUCTURE OF REENTRANT MAGNETS NEAR THE SPIN-GLASS TRANSITION

The magnetic structure of reentrant amorphous magnets (Fe-Ni-B-Si syst em) in the vicinity of the triple point of magnetic phase states (coex istence of ferromagnetic - paramagnetic - spin-glass phases at the cri tical concentration and temperature) was calculated. The model of inde pendent magnetic clusters (MC) was employed in numerical simulations o f the temperature evolution of magnetic resonance absorption line near the ferromagnetic - spin-glass transition. It is shown that results o f numerical simulations agree with the magnetoresonance measurement da ta obtained for reentrant magnets near the spin-glass transition. Expe riments were carried out in the temperature range 0.3-150 K and at fre quencies of about 75 GHz.