| 摘要 |
PURPOSE:To obtain a magnetic disk, etc. having excellent resistance to corrosion and weather and which is also highly lubricative by forming a protective layer contg. chromium oxide and silicon oxide or germanium oxide on a magnetic thin film formed on a substrate. CONSTITUTION:A magnetic layer of a ferromagnetic metallic thin film, ferromagnetic oxide, etc. is formed on an Al (alloy) substrate, a ceramic substrate, etc., and then a protective film consisting of chromium oxide and silicon oxide (one between SiO2 and SiO or their mixture) or chromium oxide and germanium oxide (one between SiO2 and SiO or their mixture) or chromium oxide, silicon oxide and germanium oxide is formed on the magnetic layer. Chromium oxide enhances the hardness, and silicon oxide and germanium oxide have excellent resistance to corrosion and weather and considerably high lubricity. As the chromium oxide content increases, the lubricity decreases. Consequently, the chromium oxide content is regulated to 15%, the thickness of the protective film is controlled to 50-1,000Angstrom to control the spacing loss to a low value, and a magnetic recording medium having excellent CSS resistant characteristic, etc. and good durability is obtained. |
