Writer core incorporating thermal sensor having a temperature coefficient of resistance

Patent metadata

Field	Value
Publication number	US-9679598-B2
Application number	US-201514836010-A
Country	US
Kind code	B2
Filing date	Aug 26, 2015
Priority date	Aug 28, 2013
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A writer core of a transducer is configured to interact with a magnetic recording medium and comprises an upper core and a lower core. At least one of the upper and lower cores comprises a return pole having a return shield. The apparatus also comprises a writer pole between the upper and lower cores, and a writer gap defined between the writer pole and the return shield. The apparatus further comprises a sensor element within one of the upper and lower cores that includes the writer gap. The sensor element has a temperature coefficient of resistance and is configured to sense for a change in temperature indicative of one or both of a change in spacing and contact between the transducer and the magnetic recording medium.

First claim

What is claimed is:

1. A method, comprising:
sensing, using a sensor element of a transducer embedded in a return shield of a writer core, a temperature at the return shield, such that a change in temperature experienced by the sensor element is the same or substantially the same as that experienced by the return shield;
measuring a change in the sensed temperature indicative of a change in spacing or contact between the transducer and a magnetic recording medium; and
performing a predetermined action in response to the measured temperature change.

2. The method of claim 1 , wherein the predetermined action comprises declaring a contact event between the transducer and the medium.

3. The method of claim 1 , wherein the transducer further comprises a write pole proximate the writer core, and the method further comprises actively synchronizing magnetic responses of the write pole and the return shield during write operations.

4. The method of claim 1 , further comprising:
sensing, in a first mode, for the change in temperature indicative of one or both of the change in spacing and contact between the transducer and the magnetic recording medium; and
enhancing, in a second mode, a magnetic field generated by the writer core;
wherein the first and second modes are separated in time.

5. The method of claim 1 , wherein the sensor element is at or near a distal end of the return shield proximate a writer gap of the writer core.

6. The method of claim 1 , further comprising sensing one or both of a change in modulation of transducer-medium spacing during flight and a change in thermal conductivities.

7. A method, comprising:
sensing, using a sensor element of a transducer situated within one of an upper core and a lower core of a writer core, a temperature at or near a return shield of the writer core, such that a change in temperature experienced by the sensor element is the same or substantially the same as that experienced by the return shield;
measuring a change in the sensed temperature indicative of a change in spacing or contact between the transducer and a magnetic recording medium;
performing a predetermined action in response to the measured temperature change; and
enhancing a gradient of a magnetic field produced by the writer core using a magnetic field produced by the sensor element.

8. The method of claim 7 , wherein the predetermined action comprises declaring a contact event between the transducer and the medium.

9. The method of claim 7 , wherein the transducer further comprises a write pole proximate the writer core, and the method further comprises actively synchronizing magnetic responses of the write pole and the return shield during write operations.

10. The method of claim 7 , further comprising:
sensing, in a first mode, for the change in temperature indicative of one or both of the change in spacing and contact between the transducer and the magnetic recording medium; and
enhancing, in a second mode, the gradient of the magnetic field produced by the writer core;
wherein the first and second modes are separated in time.

11. The method of claim 7 , wherein the sensor element is spaced apart from the return shield.

12. The method of claim 7 , wherein the sensor element is integral to the return shield.

13. The method of claim 7 , wherein the sensor element is at or near a distal end of the return shield proximate a writer gap of the writer core.

14. The method of claim 7 , further comprising sensing one or both of a change in modulation of transducer-medium spacing during flight and a change in thermal conductivities.

Assignees

• Seagate Technology Llc

Inventors

• Peng Peng
• Macken Declan
• Johnson Michael Thomas
• Guo Zheying

Classifications

• G11B5/3133

  including layers not usually being a part of the electromagnetic transducer structure and providing additional features, e.g. for improving heat radiation, reduction of power dissipation, adaptations for measurement or indication of gap depth or other properties of the structure (G11B5/3106 takes precedence) · CPC title

• G11B5/3143

  including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding (G11B5/3116, G11B5/312 take precedence) · CPC title

• G11B5/6076 Primary

  Detecting head-disk contact · CPC title

• G11B5/1278

  specially adapted for magnetisations perpendicular to the surface of the record carrier · CPC title

• G11B5/607

  using thermal means · CPC title