Servo pattern transfer
View Patent ↗A servo master having a pattern capable of being magnetically transferred as a servo pattern to a magnetic recording medium, wherein the servo master is formed of a material having a magnetic anisotropic constant perpendicular to a surface of the magnetic recording medium. The magnetic transfer method can include preparing a servo master patterned with a servo pattern to be formed on a magnetic recording medium, and arranging the servo master on the magnetic recording medium and applying an external magnetic field to the servo master in a first direction perpendicular to a recording surface of the magnetic recording medium, and in a second direction parallel to the recording surface of the magnetic recording medium.
1. A device comprising:
a servo master including a pattern capable of being magnetically transferred as a servo pattern to a magnetic recording medium, wherein the servo master is formed of a material having a magnetic anisotropy in a perpendicular direction to a recording surface of the magnetic recording medium; and
an apparatus configured to apply an external magnetic field to the servo master in a first direction perpendicular to a recording surface of the magnetic recording medium and in a second direction parallel to the recording surface of the magnetic recording medium.
2. The device of claim 1 , wherein a magnetic anisotropy constant of the servo master is about 1/20 of a perpendicular magnetic anisotropy constant of the magnetic recording medium or greater.
3. The device of claim 1 , wherein the magnetic anisotropy constant of the servo master is about 1×10 5 erg/cc or greater.
4. The device of claim 1 , wherein the servo master comprising at least one of CoCrPt, CoCrPtB, CoPt, CoFe, FePt, and CoFe.
5. The device of claim 1 , wherein the pattern comprises a plurality of tips protruding from the servo master in the perpendicular direction.
6. The device of claim 5 , wherein a distance between ends of the protruding tips and the recording surface is about 10 nm when the pattern is being transferred to the magnetic recording medium.
7. The device of claim 1 , wherein the pattern is formed using a nano-imprint process.
8. A method comprising:
preparing a servo master patterned with a servo pattern to be formed on a magnetic recording medium; and
arranging the servo master on the magnetic recording medium and applying an external magnetic field to the servo master in a first direction perpendicular to a recording surface of the magnetic recording medium, and in a second direction parallel to the recording surface of the magnetic recording medium.
9. The method of claim 8 , wherein a magnetic anisotropy constant of the servo master is about 1/20 of a perpendicular magnetic anisotropy constant of the magnetic recording medium or greater.
10. The method of claim 8 , wherein the magnetic anisotropy constant of the servo master is about 1×10 5 erg/cc or greater.
11. The method of claim 8 , wherein the servo master is formed of at least one of CoCrPt, CoCrPtB, CoPt, CoFe, FePt, and CoFe.
12. The method of claim 8 , wherein in the applying of the external magnetic field, the external magnetic field is further applied in a third direction perpendicular to the first direction and the second direction.
13. The method of claim 8 , wherein applying the external field in the second direction further comprises arranging an S-pole on a first side of the servo master and an N-pole on a second side opposite the first side of the servo master.
14. The method of claim 8 , wherein the applying the external field in the first direction further comprises arranging an N-pole on a side of the servo master away from the recording medium and an S-pole on another side of the servo master, the another side being opposite the side of the servo master away from the recording medium.
15. The method of claim 8 , wherein preparing the servo master further comprises forming the servo pattern using a nano-imprint process.
16. A device comprising:
a servo master including a pattern capable of being magnetically transferred as a servo pattern to a magnetic recording medium; and
an apparatus configured to apply an external magnetic field to the servo master in a first direction perpendicular to a recording surface of the magnetic recording medium and in a second direction parallel to the recording surface of the magnetic recording medium.
17. The device of claim 16 , wherein the servo master is formed of a material having a magnetic anisotropy in a perpendicular direction to the recording surface of the magnetic recording medium.
18. The device of claim 16 , wherein a magnetic anisotropy constant of the servo master is about 1/20 of a perpendicular magnetic anisotropy constant of the magnetic recording medium or greater.
19. The device of claim 16 , wherein apparatus is further configured to apply an external magnetic field to the servo master in a third direction perpendicular to the first direction and the second direction.
20. The device of claim 16 , wherein the pattern is formed using a nano-imprint process.