Susceptibility and High Field Magnetization of Al–Mn Quasicrystalline and Amorphous Alloys

Abstract

Magnetic susceptibility and high field magnetization up to 300 kOe are measured on Al–Mn quasicrystalline and amorphous alloys. The average local moment per Mn, < P _c >, and the paramagnetic Curie temperature, θ _p , are determined from the temrerature dependence of susceptibility. The magnitude of saturation magnetization per Mn, M _s , is much smaller than that of < P _c >, suggesting Mn sites are partly magnetic. The atomic fraction X _m . and the average local moment, P _c , of the magnetic Mn are estimated from the values of M _s and the Curie constant. All the values of X _m , P _c and |θ _p | increase monotonically with increasing Mn content in the quasicrystalline and amorphous phases. The magnetic properties of the quasicrystals are similar to those of the amorphous alloys, but slight differences are observed in the high field magnetization process and the values of X _m , P _c and θ _c .