Magnetooptical recording medium and method of producing the same
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United States of America Patent
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Aug 1, 2000
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Sep 24, 1998
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Sep 30, 1997
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Abstract
To obtain a magnetooptical recording medium with a magnetooptic effect suitable for ultraviolet radiation, x-layers and y-layers are sequentially laminated on a glass substrate, where x is a TbFeCo layer and y is a Pt or NdCo layer. This multilayer thin film structure can provide a hysteresis loop of a rectangular ratio 1 because a vertical magnetic anisotropic constant Ku is larger than a demagnetizing energy of 2.pi.Ms.sup.2 (where M is a saturated magnetization). FOM (Figure of Merit)=R.sqroot. [.theta..sub.k.sup.2 +.eta..sub.k.sup.2 ] where .theta..sub.k is a Kerr rotation angle and .eta..sub.k is a Kerr ellipticity) is 0.05 or more in the range of ultraviolet rays (of a wavelength of 400 nm or less).
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