| 摘要 |
PURPOSE:To obtain the medium having excellent resistance to corrosion and wear by providing a magnetic recording layer consisting of a ferromagnetic thin film on a nonmagnetic substrate and further furnishing the oxide film of an alloy of at least one kind of element among Ti, Zn and Hf and Co on the surface of the recording layer. CONSTITUTION:A nonmagnetic substrate 1 is made of plastic film such as polyethylene terephthalate or Al or glass having 5-100mum thickness. A magnetic recording layer 2 is formed in 0.05-1.0mum thickness by the vacuum deposition of metals such as Fe, Co and Ni or the alloy contg. the elements. A protective film layer 3 consists of the oxide of an alloy of at least one kind of metal among Ti, Zr and Hf and Co and the thickness is preferably regulated to 50-500Angstrom . The effect as the protective and lubricating film is small at <50Angstrom and the clearance between a head and the magnetic recording layer 2 is increased and the recording and reproduction efficiency is decreased at >500Angstrom . The composition ratio of Co to Ti, Zr and Hf is preferably adjusted to 1/9-9/1, the effect in improving the corrosion resistance is insufficient when Co is rich and the effect in decreasing the friction coefficient is small when the Co content is low. |
