| 摘要 |
PURPOSE:To obtain a magnetic recording medium with excellent corrosion resistance and wear resistance, by treating a magnetic substance layer made of a ferromagnetic substance metal formed on a base with ozone. CONSTITUTION:A magnetic substance made of a ferromagnetic metal formed on a base is treated by using ozone. For example, the magnetic substance layer consisting essentially of cobalt formed with vapor deposition on the base is left for 10-60min under the environment of 0.01-10vol% ozone concentration. Thus, stable cobalt oxide is formed on the surface of magnetic substance layer and grain boundary. With the <=0.01vol% ozone concentration, the oxidizing action of ozone is weak and the entire region of the magnetic substance layer can not uniformly be treated. Further, in the >=10vol% ozone concentration, the oxidizing action of ozone is too strong. In this manufacture method, high-order oxide having strong protection can be formed to the magnetic substance layer at low temperatures and the manufacture is especially effective to the magnetic substance layer vapor-deposited on the base using a plastic film with adverse effect such as heat deterioration at high-temperature treatment. |
