Claims
- 1. A method of reproducing information in a magnetooptical recording medium which comprises a first magnetic layer, which has an in-plane magnetization at a first temperature range that disappears at a second temperature range that is higher than the first temperature range; a third magnetic layer having a perpendicular magnetization; a second magnetic layer, wherein the second magnetic layer is interposed between said first and third magnetic layers, has a Curie temperature higher than the temperatures of said first and third magnetic layers, and has an in-plane magnetization at the first temperature range that changes to a perpendicular magnetization at the second temperature range; and a substrate, wherein the substrate, and the first, second and third magnetic layers are disposed in the medium in this order: the substrate, the first magnetic layer, the second magnetic layer, and the third magnetic layer, said method comprising the steps of:
- projecting a laser beam onto the substrate to create a light soot region;
- changing only a high-temperature area in a light spot region of the first and second magnetic layer to a perpendicular magnetization film so that information recorded in the third magnetic layer is transferred through the second magnetic layer to the perpendicular magnetization film of the first magnetic layer; and
- detecting the information transferred to the first magnetic layer by using reflected light from the medium which is subjected to a magneto-optic effect of the perpendicular magnetization film of the first magnetic layer.
- 2. A method of recording information in a magnetooptical recording medium which comprises a first magnetic layer being an in-plane magnetization film at a first temperature range and a perpendicular magnetization film at a second temperature range that is higher than the first temperature range, a second magnetic layer composed of a perpendicular magnetization film at both the first temperature range and the second temperature range and storing information, and a substrate, wherein the substrate, and the first and second magnetic layers are disposed in the medium in this order: the substrate, the first magnetic layer, and the second magnetic layer, said method comprising the steps of:
- projecting a laser beam onto the substrate to create a light spot region;
- applying a magnetic field, wherein the magnetization direction of the magnetic field is modulated according to information, to a light spot region of the substrate so that magnetization of the first magnetic layer is oriented to the direction of the applied magnetic field; and
- transferring the magnetization of the first magnetic layer to the second magnetic layer to form a record bit.
- 3. A method of recording information according to claim 2, further comprising the step of detecting information from the record bit at the same time as the formation of the record bit by detecting reflected light of the light spot region from the medium.
- 4. A method of recording information in a magnetooptical recording medium which comprises a first magnetic layer, which has an in-plane magnetization at a first temperature range that disappears at a second temperature range that is higher than the first temperature range; a third magnetic layer having a perpendicular magnetization; and a second magnetic layer, wherein the second magnetic layer is interposed between said first and third magnetic layers, has a Curie temperature higher than the temperatures of said first and third magnetic layers, and has an in-plane magnetization at the first temperature range that changes to a perpendicular magnetization at the second temperature range, and a substrate, wherein the substrate, and the first, second and third magnetic layers are disposed in the medium in this order: the substrate, the first magnetic layer, the second magnetic layer, and the third magnetic layer, said method comprising the steps of:
- projecting a laser beam onto the substrate to create a light spot region; and
- applying a magnetic field, wherein the magnetization direction of the magnetic field is modulated according to information, to a light spot region of the substrate so that a record bit is formed in the third magnetic layer.
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 division of application Ser. No. 08/643,833, filed May 7, 1996, now U.S. Pat. No. 5,616,428, which 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 |
3-93058 |
Apr 1991 |
JPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
643833 |
May 1996 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
111974 |
Aug 1993 |
|