| 摘要 |
PURPOSE: To obtain a magnetic recording medium which has stable magnetic characteristics even if a substrate temp. is raised and is capable of executing a high- density recording by using a glass substrate of which the value satisfying a specific condition equation attains a specific value or above at the time of IR rays of a required wavelength are passed through the substrate. CONSTITUTION: This magnetic recording medium is obtd. by laminating a ground surface layer, magnetic layer and protective layer by vapor deposition on the glass substrate 1 which effectively absorbs IR rays to attain >=0.3[1/cm] in the value satisfying the conditions of the equation at the time of allowing the IR rays of the wavelength of 3μto pass the substrate perpendicularly thereto via a heater 5 and has the thickness (d) ad reflectivity R stable to the temp. rise. Since such substrate 1 is used, the substrate 1 is stabilized even at the time of the temp. rise by heating, vapor deposition, etc., and the formation of magnetic layers having stable characteristics is possible. The magnetic recording medium which is capable of making high-density recording of >=1 giga bit per 1 square inch by using magnetoresistance(MR) elements, etc., and has the stable magnetic characteristics is obtd. In the equation, Io: the intensity of incident light, I: the intensity of transmitted light.
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