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Sputtered thin films of binary YxCo1-x with 0 < x < 0.54 and thickness 15 nmare investigated to help understand the ferromagnetism of cobalt in amorphousrare-earth cobalt alloys. The magnetic moment per cobalt falls to zero at x0 =0.50, where the appearance of magnetism is marked by a para-process with adimensionless susceptibility of up to 0.015. All films are magnetically soft,with densities that fall between those of crystalline Y-Co intermetalliccompounds and the density of a relaxed 10,000-atom binary random close-packedmodel of hard spheres with an Y:Co volume ratio of 3:1, where the packingfractions for all films lies in a narrow range around 0.633 and Co iscoordinated by 3.2 Co and 3.2 Y atoms at x = 0.5. All films with x < 0.4exhibit in-plane shape anisotropy that is about six times as great as anintrinsic perpendicular component. Average cobalt spin and orbital momentsobtained by X-ray magnetic circular dichroism were 1.31 and 0.32 Bohrmagnetons, respectively for amorphous Y0.25Co0.75. Strong local anisotropy isassociated with the large cobalt orbital moment, but there is little influenceof anisotropy on the ferromagnetic order because of exchange averaging. TheHall effect and magnetoresistance are modelled in terms of effective uniformrotation of the magnetization, with spontaneous and band contributions.Amorphous YxCo1-x is contrasted with amorphous YxFe1-x, which exhibits randomnoncollinear magnetic order that is very sensitive to the film density.

Magnetism, transport and atomic structure of amorphous binary YxCo1-x alloys