An information recording medium comprising an information recording film formed on a base on which regular depressions and projections having Ra of 0.1 to 1.5 nm have been formed, the information recording film containing as a major component a rare earth-transition metal amorphous alloy capable of magnetically...http://www.google.com.au/patents/US6687197?utm_source=gb-gplus-sharePatent US6687197 - High density information recording medium and slider having rare earth metals
