Patent ID: 6022630
Filing Date: 2000-02-08
Classification: B82Y,G11B,H01F,Y10S,Y10T

Abstract:
A composite multilayer laminate recording medium having the potential to allow direct overwriting of data, said medium comprising a substrate material and at least two multilayer films comprising a platinum layer and a cobalt layer, and wherein there is provided at a multilayer interface a spacer comprising one platinum layer of one or both multilayers or a separately-deposited material, wherein said multilayer films of platinum and cobalt are exchange coupled and have perpendicular magnetic anisotropy, one of said multilayer films having a high room temperature coercivity (H.sub.c) of 2 to 15 kOe and a low Curie temperature (T.sub.c) of 100.degree. C. to 400.degree. C. and known as the memory layer and one of said multilayer films having a low room temperature coercivity of 0.5 to 10 kOe and a high Curie temperature of 175.degree. C. to 500.degree. C. and known as the reference layer, the difference in coercivity and Curie temperature between the two multilayer films being sufficient to permit a direct overwriting process.