Magnetic properties of various crystalline phases and amorphous Al-Si-Mn and Al-Mn alloys

The present study examines the magnetic properties of four distinct magnetic systems. First, the range of amorphous Al-Mn films was extended down to 7.5 at. % Mn from the previous limit of 14 at. % obtained on both amorphous films and icosahedral ribbons, such films still exhibiting a local magnetic moment (≃0.54${\mu }_B$). Second, quenched supersaturated fcc Al-Mn alloys in the form of film and melt-spun ribbons display a local magnetic moment similar to that observed in amorphous and icosahedral phases. Third, the α-${\mathrm{Al}}_{73}$ ${\mathrm{Si}}_{10}$ ${\mathrm{Mn}}_{17}$ phase, similarly to orthorhombic ${\mathrm{Al}}_6$Mn, does not exhibit a local magnetic moment. Finally, the ferromagnetism discovered in amorphous Al-Si-Mn melt-spun ribbons has now been observed in crystalline alloys with a structure similar to β–Al-Mn-Si.