Claims
- 1. A magnetooptical recording medium, comprising:
- a first magnetic layer, said first magnetic layer being composed of a film that is perpendicularly magnetizable at both room temperature and a raised temperature, the raised temperature being some temperature above room temperature, permitting information to be stored in said first magnetic layer; and
- a second magnetic layer, said second magnetic layer being composed of Gd.sub.x (Fe.sub.100-y Co.sub.y).sub.100-x, where 27.ltoreq.x.ltoreq.31 and 28.ltoreq.y.ltoreq.50, and being in-plane magnetizable at room temperature, but perpendicularly magnetizable at said raised temperature.
- 2. A magnetooptical recording medium according to claim 1, wherein said first and second magnetic layers are exchange-coupled to each other when said second magnetic layer is perpendicularly magnetized.
- 3. A magnetooptical recording medium according to claim 1, wherein Curie temperature of said second magnetic layer is higher than Curie temperature of said first magnetic layer.
- 4. A magnetooptical recording medium according to claim 1, wherein said second magnetic layer has a compensation temperature that is between room temperature and its Curie temperature.
- 5. A magnetooptical recording medium according to claim 1, further comprising a third magnetic layer, said third magnetic layer being composed of a film that is in-plane magnetizable at both room temperature and said raised temperature, said third magnetic layer having a Curie temperature that is lower than the Curie temperatures of both said first and second magnetic layers.
- 6. A magnetooptical recording medium according to claim 1, further comprising a thermal conductive layer formed adjacent to said first magnetic layer.
- 7. A magnetooptical recording medium according to claim 5, wherein said third magnetic layer is formed adjacent to said second magnetic layer.
- 8. A magnetooptical recording medium according to claim 6, further comprising a dielectric layer interposed between said thermal conductive and first magnetic layers.
- 9. A magnetooptical recording medium according to claim 1, wherein the thickness of said second magnetic layer is 300 .ANG.-900 .ANG..
- 10. A magnetooptical recording medium according to claim 4, wherein said compensation temperature is at least 240.degree. C.
Priority Claims (10)
Number |
Date |
Country |
Kind |
4-230265 |
Aug 1992 |
JPX |
|
4-230266 |
Aug 1992 |
JPX |
|
4-230277 |
Aug 1992 |
JPX |
|
5-038137 |
Feb 1993 |
JPX |
|
5-038138 |
Feb 1993 |
JPX |
|
5-043786 |
Mar 1993 |
JPX |
|
5-066656 |
Mar 1993 |
JPX |
|
5-098025 |
Apr 1993 |
JPX |
|
5-188400 |
Jul 1993 |
JPX |
|
5-188438 |
Jul 1993 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 08/111,974, filed Aug. 26, 1993, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
5278810 |
Takahashi et al. |
Jan 1994 |
|
Foreign Referenced Citations (6)
Number |
Date |
Country |
0352548 |
Jan 1990 |
EPX |
0437308 |
Jul 1991 |
EPX |
0492581 |
Jul 1992 |
EPX |
0498440 |
Aug 1992 |
EPX |
0509836 |
Oct 1992 |
EPX |
0393058 |
Apr 1991 |
JPX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
111974 |
Aug 1993 |
|