HIGH-DENSITY MAGNETIC RECORDING AND REPRODUCING METHOD AND HIGH-DENSITY MAGNETIC RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To make it possible to read out multiple-value information of an extremely large number by recording one kind of magnetization within multistage intensity proportional to the intensity of an impressed magnetic field in one spot of a magnetic recording medium, irradiating a recording section with linearly polarized light and reading out the rotating angle of the plane of polarization of light as the multiple-value information. ;SOLUTION: A reflection film 2, multilayered dielectric films, a magnetic film 3 which is a perpendicularly magnetized film and a protective film 4 are formed on a substrate 1. The magnetic field intensity by the soft magnetic core of the recording section is changed to six stages of ±0.5, ±0.75, ±1.0 k Gauss and the spot of 0.5 μm×05 μm is irradiated with a laser beam of 515 nm. Confirmation is then made that the rotating angle of the deflection plane of a Faraday effect is proportional to magnetic field intensity. As a result, confirmation is made that the rotating angle of the deflection plane may be read out as the multiple-value information. Since the rotation of the deflection plane of the Faraday effect is utilized, higher S/N may be obtd. The one side of the high-density magnetic recording layer is provided with a reflection layer and reproduction is executed by reflected light. Since the recording and reproducing head is arranged on one side, the device is made compact and the easy reproduction is made possible.;COPYRIGHT: (C)2000,JPO