Microwave-assisted magnetic recording with collocated microwave and write fields

• US 8,422,159 B2
• Filed: 06/04/2009
• Issued: 04/16/2013
• Est. Priority Date: 06/04/2009
• Status: Active Grant

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Gao, Kaizhong, Cazacu, Alexandru, Mallary, Michael Leigh, Lamberton, Robert William
• Primary Examiner(s): BERNATZ, KEVIN M
• Application Number:
  US12/478,461
• Publication Number:
  US 20100309577A1
• Time in Patent Office: 1,412 Days
• Field of Search: None
• US Class Current: 360/75
• CPC Class Codes: G11B 2005/0005 Arrangements, methods or circuits
• CPC Class Codes: G11B 2005/0024 Microwave assisted recording
• CPC Class Codes: G11B 5/02 Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
• CPC Class Codes: G11B 5/314 where the layers are extra layers normally not provided in the transducing structure, e.g. optical layers G11B5/3196 takes precedence
• CPC Class Codes: G11B 5/6005 Specially adapted for spacing from a rotating disc using a fluid cushion

Abstract

Methods and devices are provided for microwave-assisted magnetic recording with collocated microwave and write fields. An illustrative device includes a magnetic write pole and one or more alternating-field components. The magnetic write pole is configured for providing a magnetic write field. The one or more alternating-field components are disposed to at least partially coincide with the magnetic write pole. The one or more alternating-field components are configured to provide an alternating magnetic field having a microwave frequency and an orientation that is at least partially transverse to the magnetic write field.

Claims

1. A device comprising:

a magnetic write pole configured to provide a magnetic write field, the magnetic write pole having a gap embedded therein at a bearing surface; and

an alternating-field generation component disposed in the gap and configured to provide an alternating magnetic field having a microwave frequency and an orientation that is at least partially transverse to the magnetic write field.

2. The device of claim 1, wherein the alternating-field generation component at least partially coincides with the magnetic write pole on an along-track longitudinal position.

3. The device of claim 1, in which the alternating-field generation component comprises a conductive element.

4. The device of claim 3, in which the conductive element is configured to carry an alternating electrical current at a microwave frequency.

5. The device of claim 3, wherein the conductive element comprises a conductive wire.

6. The device of claim 5, in which the conductive element further comprises conductive leads on opposing sides of the magnetic write pole, and the conductive wire is connected to the conductive leads.

7. The device of claim 5, further comprising a yoke on which the magnetic write pole is disposed, and a magnetic return shield disposed longitudinally proximate to the magnetic write pole, and the conductive element further comprises a first conductive lead that passes adjacent to the yoke and a second conductive lead is connected to the return shield, such that the first and second conductive leads connect with the conductive wire.

8. The device of claim 1, wherein the magnetic write pole and the alternating-field generation component are at an approximately equal distance away from a recording medium at their respective closest points to the recording medium.

9. A device comprising:

a magnetic write pole configured to provide a perpendicular magnetic write field, the magnetic write pole having a gap embedded therein near an air bearing surface; and

a conductive wire in the gap, wherein the conductive wire is configured to provide a microwave-frequency oscillating magnetic field.

10. The device of claim 9, further comprising first and second conductive leads connected to the conductive wire, wherein the microwave-frequency oscillating magnetic field is oriented at an angle to the perpendicular magnetic write field.

11. The device of claim 10, further comprising:

a moveable magnetic recording medium;

a suspension apparatus, moveably disposed proximate to the magnetic recording medium; and

a magnetic head, disposed on the suspension apparatus and positionable by the suspension apparatus proximate to the magnetic recording medium, wherein the magnetic write pole, the conductive wire, and the first and second conductive leads are disposed on the magnetic head, and wherein the conductive wire is configured to provide the microwave-frequency oscillating magnetic field to a position on the magnetic recording medium that overlaps the perpendicular magnetic write field.

12. A device comprising:

a magnetic write pole configured to provide a perpendicular magnetic write field, the magnetic write pole having a gap embedded therein at a bearing surface; and

means, positioned in the gap, for providing a microwave-frequency oscillating magnetic field.

13. The device of claim 12, further comprising first and second conductive leads connected to the means for providing the microwave-frequency oscillating magnetic field, wherein the microwave-frequency oscillating magnetic field is oriented at an angle to the perpendicular magnetic write field.

14. The device of claim 12, further comprising:

a moveable magnetic recording medium;

a suspension apparatus, moveably disposed proximate to the magnetic recording medium; and

a magnetic head, disposed on the suspension apparatus and positionable by the suspension apparatus proximate to the magnetic recording medium, wherein the magnetic write pole, the means for providing the microwave-frequency oscillating magnetic field, and the first and second conductive leads are disposed on the magnetic head, and wherein the means for providing the microwave-frequency oscillating magnetic field is configured to provide the microwave-frequency oscillating magnetic field to a position on the magnetic recording medium that overlaps the perpendicular magnetic write field.