Apparatus with first and second close points on media-facing surface of magnetic head

• US 9,202,490 B2
• Filed: 03/12/2014
• Issued: 12/01/2015
• Est. Priority Date: 03/12/2014
• Status: Active Grant

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Zuckerman, Neil, Andruet, Raul Horacio, Wessel, James Gary, Rea, Chris
• Primary Examiner(s): CASTRO, ANGEL A
• Application Number:
  US14/206,657
• Publication Number:
  US 20150262596A1
• Time in Patent Office: 629 Days
• Field of Search: 360/125.31
• US Class Current: 1/1
• CPC Class Codes: G11B 2005/0021 Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal
• CPC Class Codes: G11B 33/144 by detection, control, regulation of the temperature
• CPC Class Codes: G11B 5/09 Digital recording
• CPC Class Codes: G11B 5/1871 Shaping or contouring of the transducing or guiding surface
• 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 5/4866 the arm comprising an optical waveguide, e.g. for thermally-assisted recording
• CPC Class Codes: G11B 5/607 using thermal means
• CPC Class Codes: G11B 5/6088 Optical waveguide in or on flying head

Abstract

A magnetic head includes a read transducer and a write transducer at a media-facing surface of the magnetic head. The magnetic head includes at least one heater that causes heat deformation at the media-facing surface in response to different first and second energizing currents. The first energizing current results in a first close point between the media-facing surface and a recording medium. The second energizing current results in a second close point between the media-facing surface and the recording medium. The second close point is at a different location in the media-facing surface than the first close point.

Claims

1. A magnetic head, comprising:

a read transducer and a write transducer at a media-facing surface of the magnetic head;

at least one heater that causes heat deformation at the media-facing surface in response to different first and second energizing currents, the first energizing current resulting in a first close point between the media-facing surface and a recording medium, the second energizing current resulting in a second close point between the media-facing surface and the recording medium, the first close point being proximate to the read transducer, the second close point at a different location on the media-facing surface than the first close point; and

a contact pad disposed at the media-facing surface between the read transducer and the write transducer, wherein the contact pad corresponds to a location near the second close point.

2. The magnetic head of claim 1, wherein the first and second energizing currents correspond to respective read and write modes during which the respective read and write transducers are used for reading and writing to the recording medium.

3. The magnetic head of claim 1, wherein the contact pad comprises:

a push block extending within the magnetic head away from the media-facing surface, the push block formed of a first material with a relatively high coefficient of thermal expansion relative to the read and write transducers; and

a hard, corrosion-resistant coating covering the push block at the media-facing surface.

4. The magnetic head of claim 1, further comprising an energy delivery path proximate the write transducer, the energy delivery path heating the recording medium during the write operation, and wherein at least one of the write transducer and the energy delivery path contributes to the heat deformation at the media-facing surface and influences one of the first and second close points.

5. The magnetic head of claim 1, further comprising a second heater that contributes to the heat deformation at the media-facing surface in response to third and fourth energizing currents during the respective read and write operations, the first and third energizing currents resulting in the first close point, the second and fourth energizing currents resulting in the second close point.

6. The magnetic head of claim 1, further comprising a temperature sensor between the first and second close points, and wherein changes in a clearance between the temperature sensor and the recording medium are minimized when the first and second energizing currents are applied resulting in the first and second close points.

7. A magnetic head, comprising:

a read transducer at a media-facing surface of the magnetic head;

a write transducer at the media-facing surface and located in a downtrack direction relative to the read transducer;

a contact pad disposed at the media-facing surface between the read transducer and the write transducer; and

at least one heater that causes heat deformation at the media-facing surface in response to different first and second energizing currents, the first energizing current resulting in a first close point between the media-facing surface and a recording medium to be proximate the read transducer, the second energizing current resulting in a second close point between the media-facing surface and the recording medium to be proximate the contact pad.

8. The magnetic head of claim 7, wherein the second close point minimizes contact between the write transducer and the recording medium during the write operation.

9. The magnetic head of claim 7, further comprising an energy delivery path proximate the write transducer, the energy delivery path heating the recording medium during the write operation.

10. The magnetic head of claim 9, wherein the energy delivery path contributes to formation of the second close point during the write operation.

11. The magnetic head of claim 7, further comprising a second heater that contributes to the heat deformation at the media-facing surface in response to third and fourth energizing currents during the respective read and write operations, the first and third energizing currents resulting in the first close point, the second and fourth energizing currents resulting in the second close point.

12. The magnetic head of claim 7, wherein the contact pad is closer to the read transducer than to the write transducer.

13. The magnetic head of claim 7, wherein the first and second energizing currents correspond to respective read and write operations.

14. The magnetic head of claim 7, wherein the contact pad comprises:

a push block extending within the magnetic head away from the media-facing surface, the push block formed of a first material with a relatively high coefficient of thermal expansion relative to the read and write transducers; and

a hard, corrosion-resistant coating covering the push block at the media-facing surface.