Magnetooptical recording medium and method of producing the same

Details Magnetooptical recording medium and method of producing the same Magnetooptical recording medium and method of producing the same

1998-09-24

2000-08-01

Kiliman, Leszek

Stock material or miscellaneous articles

Composite

Of inorganic material

428694SC, 428694RE, 428694MM, 428694IS, 428900, 428336, 363 13, G11B 566

Patent

active

060964464

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).

REFERENCES:
T. Suzuki, Magnetic and Magneto-Optic Properties of Rapid Thermally Crystallized Garnet Films (Invited), J. Appl. Phys. vol. 69, No. 8, pp. 4756-4760, Apr. 1991.
W. B. Zeper et al., Evaporated Co/Pt Layered Structures for Magneto-Optical Recording, IEEE Transactions on Magnetics, vol. 25, No. 5, pp. 3764-3766, Sep. 1989.
R. J. Gambino et al., Magneto-Optic Properties of Nd-Fe-Co Amorphous Alloys, J. Appl. Phys., vol. 57, No. 1, pp. 3906-3908, Apr. 1985.
T. Suzuki et al., Magnetic and Magneto-Optical Properties of (Nd, Pr)-(Fe, Co) Alloy Amorphous Films with Huge Perpendicular Magnetic Anisotropy, IEEE Transactions of Magnetics, vol. Mag-23, No. 5, pp. 2958-2960, Sep. 1987.
T. Suzuki et al., Magnetic and Magneto-Optical Properties of Nd-Th-Fe-Co Vertically Magnetized Films, IEEE Transactions on Magnetics, vol. 24, No. 6, pp. 3452-2454, Nov. 1988.

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