Microwave-assisted magnetic recording device and method of formation thereof
A magnetic head, according to one embodiment, includes a magnetized high-speed rotor placed in the vicinity of a main magnetic pole, wherein the main magnetic pole generates a magnetized rotating magnetic field, wherein information is recorded by generating a high-frequency magnetic field from the magnetized high-speed rotor and switching the magnetic head between a magnetic resonance state and a magnetization state, and wherein the magnetic head has a structure such that leaking is reduced for magnetic fields applied parallel to a magnetized rotating surface of the magnetized high-speed rotor from the main magnetic pole. Additional systems and methods are also presented.
1. A magnetic head, comprising:
a magnetized high-speed rotor positioned at a media-facing surface; and
a main magnetic pole positioned near the magnetized high-speed rotor at the media-facing surface, the main magnetic pole being aligned with the magnetized high-speed rotor along a track direction, wherein a side surface of the main magnetic pole facing the magnetized high-speed rotor is inclined away from the magnetized high-speed rotor in the track direction,
wherein information is recorded by generating a high-frequency magnetic field from the magnetized high-speed rotor and switching the magnetic head between a magnetic resonance state and a magnetization state, and
wherein the magnetic head reduces leaking for magnetic fields applied parallel to a magnetized rotating surface of the magnetized high-speed rotor from the main magnetic pole.
2. The magnetic head according to claim 1 , wherein the main magnetic pole generates a magnetized rotating magnetic field.
3. The magnetic head according to claim 2 , wherein the magnetized high-speed rotor is positioned on a leading side of the main magnetic pole.
4. The magnetic head according to claim 2 , wherein the magnetized high-speed rotor is positioned on a trailing side of the main magnetic pole.
5. The magnetic head according to claim 1 , wherein a height in an element height direction of a magnetic pole opposite the main magnetic pole is greater than a distance from the media-facing surface to a flare point of the main magnetic pole.
6. The magnetic head according to claim 1 , wherein the main magnetic pole is positioned on a leading side of the magnetized high-speed rotor.
7. The magnetic head according to claim 1 , wherein the main magnetic pole is positioned on a trailing side of the magnetized high-speed rotor.
8. The magnetic head according to claim 1 ,
wherein the main magnetic pole generates a reverse magnetic field, and
wherein a height of a magnetic pole opposite the main magnetic pole is greater at the media-facing surface than at a flare point of the main magnetic pole.
9. The magnetic head according to claim 8 , further comprising a magnetic film provided near an air bearing surface end of the main magnetic pole and positioned between the main magnetic pole and the magnetized high-speed rotor, wherein a first distance between film surfaces of the magnetic film and the main magnetic pole at a flare point of the main magnetic pole is greater than a second distance between film surfaces of the magnetic film and the main magnetic pole at an air bearing surface end of the magnetic film.
10. The magnetic head according to claim 8 ,
wherein a bypass magnetic path is formed from near a side surface of the main magnetic pole toward the magnetic pole opposite the main magnetic pole, and
wherein a distance from the media-facing surface on an end separated from the media-facing surface of the bypass magnetic path is greater than a distance from the media-facing surface to the flare point of the main magnetic pole.
11. The magnetic head according to claim 10 , wherein the magnetized high-speed rotor is positioned on a leading side of the main magnetic pole.
12. The magnetic head according to claim 10 , wherein the magnetized high-speed rotor is positioned on a trailing side of the main magnetic pole.
13. The magnetic head according to claim 8 , wherein the main magnetic pole is positioned on a leading side of the magnetized high-speed rotor.
14. The magnetic head according to claim 8 , wherein the main magnetic pole is positioned on a trailing side of the magnetized high-speed rotor.
15. A disk drive system, comprising:
a magnetic storage medium;
at least one magnetic head as recited in claim 8 configured to write data to the magnetic storage medium;
a slider configured to support the at least one magnetic head;
a drive mechanism configured to pass the magnetic storage medium over the at least one magnetic head; and
a control unit coupled to the at least one magnetic head configured to control operation of the at least one magnetic head.
16. A disk drive system, comprising:
a magnetic storage medium;
at least one magnetic head configured to write data to the magnetic storage medium, each of the at least one magnetic head comprising:
a magnetized high-speed rotor positioned at a media-facing surface; and
a main magnetic pole positioned near the magnetized high-speed rotor at the media-facing surface, the main magnetic pole being aligned with the magnetized high-speed rotor along a track direction, wherein a side surface of the main magnetic pole facing the magnetized high-speed rotor is inclined away from the magnetized high-speed rotor in the track direction,
wherein information is recorded by generating a high-frequency magnetic field from the magnetized high-speed rotor and switching the magnetic head between a magnetic resonance state and a magnetization state, and
wherein each of the at least one magnetic head reduces leaking for magnetic fields applied parallel to a magnetized rotating surface of the magnetized high-speed rotor from the main magnetic pole;
a slider configured to support the at least one magnetic head;
a drive mechanism configured to pass the magnetic storage medium over the at least one magnetic head; and
a control unit coupled to the at least one magnetic head configured to control operation of the at least one magnetic head.
17. A magnetic head, comprising:
a magnetized high-speed rotor positioned at a media-facing surface; and
a main magnetic pole positioned near the magnetized high-speed rotor at the media-facing surface, the main magnetic pole being aligned with the magnetized high-speed rotor along a track direction, wherein a side surface of the main magnetic pole facing the magnetized high-speed rotor is inclined away from the magnetized high-speed rotor in the track direction,
wherein the main magnetic pole generates a magnetized rotating magnetic field,
wherein information is recorded by generating a high-frequency magnetic field from the magnetized high-speed rotor and switching the magnetic head between a magnetic resonance state and a magnetization state,
wherein the magnetic head reduces leaking for magnetic fields applied parallel to a magnetized rotating surface of the magnetized high-speed rotor from the main magnetic pole, and
wherein a height in an element height direction of a magnetic pole opposite the main magnetic pole is greater than a distance from the media-facing surface to a flare point of the main magnetic pole.
18. The magnetic head according to claim 17 , wherein the magnetized high-speed rotor is positioned on a leading side of the main magnetic pole.
19. The magnetic head according to claim 17 , wherein a height in an element height direction of a magnetic pole opposite the main magnetic pole is greater than a distance from the media-facing surface to a flare point of the main magnetic pole, and wherein the magnetized high-speed rotor is positioned on a trailing side of the main magnetic pole.