Abstract
Rare earth-transition metal (RE-TM) amorphous films have been used as magneto-optical recording media. One of the most important properties is the perpendicular magnetic anisotropy, the main origin of which is explained by one ion anisotropy of rare earth ion. However, it is also noted that the anisotropy contribution due to the magnetostriction depends in a very similar manner on the RE species as in the case of the main anisotropy. Thus it was suggested that the main origin of the magnetostriction might be the one ion anisotropy of RE. The present work reports the saturation magnetostriction constant λs of various RE-Co amorphous alloy films with RE=Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er in the range of RE concentration of 0%–40%. In most cases, λs increases with RE concentration, then decreases after showing a peak and disappears altogether with ferromagnetism. For an RE species with a small one ion anisotropy, λs is small with a value of less than 2×10−5, and is found to be contributed primarily from Co. For RE with larger one ion anisotropy, namely for RE=Sm, Pr, Tb, and Dy, λs has values of the order of 10−4 and is estimated to be contributed mainly from RE one ion anisotropy.
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