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1. 发明申请

WO1993010530A1 MAGNETOOPTICAL RECORDING MEDIA 审中-公开
标题翻译：磁记录媒体
公开(公告)号：WO1993010530A1
公开(公告)日：1993-05-27
申请号：PCT/JP1992001528
申请日：1992-11-20
申请人： SEIKO EPSON CORPORATION , MIYAZAWA, Hiromu , HOSHINA, Shoji , SHIMOKAWATO, Satoshi , ICHIKAWA, Masaaki , ISHIDA, Masaya , KAWASE, Takeo , MIKOSHIBA, Toshiaki , NEBASHI, Satoshi , SHIMODA, Tatsuya
发明人： SEIKO EPSON CORPORATION
IPC分类号： G11B11/10
CPC分类号： G11B11/10593 , G11B11/10582 , G11B11/10586 , Y10S428/90 , Y10T428/26 , Y10T428/265
摘要： A magnetooptical recording medium comprises a transparent substrate (10), on which are sequentially laminated a protective film (14); a first magnetic film (11) made of a light rare earth metal, heavy rare earth metal, and transition metal alloy; a second magnetic film (12) made of a light rare earth metal, heavy rare earth metal, and transition metal alloy; a third magnetic film (13) made of a light rare earth metal, heavy rare earth metal, and transition metal alloy; a protective film (15); and a reflecting film (16). The sandwich of the first, second and third magnetic layers constitutes a recording film (17). The compositions of the first and third magnetic layers contain a large amount of light rare earth metal and have a large Kerr rotational angle in a single wavelength region (400 nm to 700 nm). On the other hand, the composition of the second magnetic layer contains a large amount of heavy rare earth metal and has a property suitable for vertical magnetization. The recording film (17) consisting of the sandwich of the first, second and third magnetic layers has a large Kerr rotational angle as a whole in a short wavelength region, and has a large coercive force. This recording film (17) is sufficiently thin (below 400 Å). When the three-layered sandwich and the reflecting layer (16) are combined with each other, a further greater Kerr rotational angle can be obtained.

2. 发明申请

WO1994003892A1 MAGNETO-OPTIC RECORDING MEDIUM AND METHOD OF ITS MANUFACTURE METHOD 审中-公开
标题翻译：磁光记录介质及其制造方法
公开(公告)号：WO1994003892A1
公开(公告)日：1994-02-17
申请号：PCT/JP1993001062
申请日：1993-07-28
申请人： SEIKO EPSON CORPORATION , KAWASE, Takeo , ISHIDA, Masaya , NEBASHI, Satoshi , SHIMOKAWATO, Satoshi , MIKOSHIBA, Toshiaki , HOSHINA, Shoji , TAKAKUWA, Atsushi , MIYAZAWA, Hiromu
发明人： SEIKO EPSON CORPORATION
IPC分类号： G11B11/10
CPC分类号： G11B11/10591 , G11B11/10582 , G11B11/10584 , G11B11/10586 , Y10S428/90 , Y10T428/26 , Y10T428/265
摘要： A recording medium for magnetic field modulation recording by which the recording can be done with the weakest possible demodulating field. On a transparent substrate (11), a first dielectric layer (12), a recording layer (13), a recording auxiliary layer (14), a second dielectric layer, and a reflecting layer (16) are formed. The recording layer is made of a transition metal-rare earth metal amorphous alloy, and usually has a thickness of hundreds Angstroms. The recording auxiliary layer (14) is also made of a transition metal-rare earth metal amorphous alloy, but its Curie temperature Tc2 is 10K higher than the Curie temperature Tc1 of the recording layer (13). The layer (14) is as thin as 70 Angstroms or less. The aspect ratio of the recording auxiliary layer (14) is 0.7 or more at the Curie temperature Tc1 of the recording layer (13). These required characteristics of the recording auxiliary layer (14) can be materialized by adjusting the composition of the recording auxiliary layer (14) and reducing its density. As another materials for the recording auxiliary layer (14), a transition metal such as Fe, Co, a non-magnetic metal such as Pt, Al, Ti, Cr, or a nitride of transition metal-rare earth metal amorphous alloy. This medium is particularly suitable for a small-sized magneto-optic disc.
摘要翻译：一种用于磁场调制记录的记录介质，通过该记录介质可以用最弱可能的解调场进行记录。在透明基板（11）上形成第一介电层（12），记录层（13），记录辅助层（14），第二介电层和反射层（16）。记录层由过渡金属 - 稀土金属非晶合金制成，通常具有几百埃的厚度。记录辅助层（14）也由过渡金属 - 稀土金属非晶合金制成，但其居里温度Tc2比记录层（13）的居里温度Tc1高10K。层（14）薄至70埃或更小。在记录层（13）的居里温度Tc1下，记录辅助层（14）的纵横比为0.7以上。可以通过调节记录辅助层（14）的组成并降低其密度来实现记录辅助层（14）的这些所需的特性。作为记录辅助层（14）的另一种材料，过渡金属如Fe，Co，非磁性金属如Pt，Al，Ti，Cr或过渡金属 - 稀土金属非晶合金的氮化物。该介质特别适用于小型磁光盘。

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