Crystallization and Magnetic Properties of sNb7 Amorphous Ribbons

The amorphous FesJBsNb, and its nanocr) stallization have been studied b) x-ra) Mossbauer spectroscopy and magnetic moment measurements The average hlperfine field HhAT) of the amorphous state shows a temperature dependence of ( HhAr) - ffii(0) ) / Hhf(0) = - 0 52 ( T/Tc )''l - 0 34 ( TIT( )"2 for T/T( < 0 7 indicative of spin-wave excitation The quadrupole splitting just above the Curie temperature Tc is 0 41 M/s whereas the average quadrupole shift below Ti is zero The Curie and crlstallization temperatures are determined to be TC = 330 K and T, = 730 K respective11 for a heating rate of 5 Wmin The occupied area of the nanocrystalline phase at the optimum annealing