Magnetic viscosity in spin glass Fe-Ni-B-Si amorphous alloys

Abstract
The magnetic viscosity near the ferromagnet to spin glass transition was studied for amorphous (Fe‐Ni)75 B15 Si10 alloys. The spin glass transition temperature Tf was defined by the maximum in the viscosity versus temperature plot measured at low fields. The result strongly suggests the presence of a well defined line of transition between ferromagnetic to spin glass, over a range of composition.