Magnetic properties of Al-Si-Mn and Al-Mn quasicrystals and amorphous films

Abstract

Unlike the orthorhombic phase, the icosahedral phase of ${\mathrm{Al}}_{86}$ ${\mathrm{Mn}}_{14}$ exhibits a local magnetic moment. The effective moment of icosahedral-phase Al-Mn and Al-Si-Mn alloys increases with Mn concentration up to a maximum of (1.5±0.5${\mu }_B$). The amorphous and icosahedral phases of Al-Si-Mn have similar magnetic properties for Si concentrations ≲6 at. %, and the moments seem to order in a spin-glass state. For Si concentrations ≳30 at. %, amorphous Al-Si-Mn orders ferromagnetically.