Bond pad sharing for powering multiple writers of a recording head

Patent metadata

Field	Value
Publication number	US-9934807-B2
Application number	US-201615196549-A
Country	US
Kind code	B2
Filing date	Jun 29, 2016
Priority date	Jun 29, 2016
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

A magnetic recording head includes a plurality of writers and at least one reader. The plurality of writers and the reader define a plurality of close points of the head. The plurality of writers are spaced apart from one another in a cross-track direction and positioned in the same plane of the head. A plurality of contact sensors are positioned proximate the plurality of writers and the reader. The contact sensors are coupled together and to a pair of electrical bond pads of the head and configured to sense for head-disk contact at each of the close points.

First claim

What is claimed is:

1. An apparatus, comprising:
a plurality of writers and at least one reader of a magnetic recording head, the plurality of writers and the reader defining a plurality of close points of the head;
the plurality of writers spaced apart from one another in a cross-track direction and positioned in the same plane of the head; and
a plurality of contact sensors positioned proximate the plurality of writers and the reader, the contact sensors coupled together and to a pair of electrical bond pads of the head and configured to sense for head-disk contact at each of the close points.

2. The apparatus of claim 1 , wherein:
at least one of the plurality of writers comprises a wide write pole;
at least one of the plurality of writers comprises a narrow write pole relative to wide write pole; and
the wide write pole and the narrow write pole are configured to implement interlaced magnetic recording.

3. The apparatus of claim 1 , wherein the plurality of contact sensors comprises at least a writer contact sensor and a reader contact sensor.

4. The apparatus of claim 3 , wherein the writer contact sensor is positioned substantially equidistant between the plurality of writers.

5. The apparatus of claim 3 , wherein:
the writer contact sensor is positioned proximate a shield of each of the plurality of writers; and
the writer contact sensor is configured to sense for head-disk contact via a temperature change in the shield of each writer.

6. The apparatus of claim 3 , wherein a center of the writer contact sensor is in down-track alignment with a center of the reader contact sensor.

7. The apparatus of claim 1 , wherein the reader contact sensor is configured to sense head-disk contact and thermal asperities.

8. The apparatus of claim 1 , wherein each of the contact sensors comprises a dual-ended temperature coefficient of resistance (DETCR) sensor.

9. The apparatus of claim 1 , wherein each of the contact sensors is situated at or near an air bearing surface of the head.

10. An apparatus, comprising:
a slider configured to interact with a magnetic recording medium, the slider comprising a plurality of electrical bond pads;
a first writer disposed at a first close point of the slider;
a second writer disposed at a second close point of the slider, the first and second writers spaced apart from one another in a cross-track direction and positioned in the same plane of the slider;
a reader disposed at a third close point of the slider; and
three contact sensors each configured to sense contact between the slider and the medium;
wherein a first contact sensor is situated at or near the first close point of the first writer, the second contact sensor is situated at or near the second close point of the second writer, and the third contact sensor is situated at or near the third close point of the reader; and
the three contact sensors are coupled together and between a pair of the bond pads.

11. The apparatus of claim 10 , wherein:
the first writer comprises a wide write pole;
the second writer comprises a narrow write pole relative to that of the first writer; and
the wide write pole and the narrow write pole are configured to implement interlaced magnetic recording.

12. The apparatus of claim 10 , wherein the three contact sensors are spaced apart from one another in a cross-track direction and positioned in the same plane.

13. The apparatus of claim 10 , wherein the third contact sensor is smaller in size than the first and second contact sensors.

14. The apparatus of claim 10 , wherein the third contact sensor is configured to sense for slider-medium contact and thermal asperities.

15. The apparatus of claim 10 , wherein the three contact sensors are coupled in series between the pair of bond pads.

16. The apparatus of claim 10 , wherein the three contact sensors are coupled in parallel between pair of bond pads.

17. The apparatus of claim 10 , wherein a first contact sensor is coupled in parallel to a second contact sensor, and the parallel-coupled first and second contact sensors are coupled in series with a third contact sensor.

18. The apparatus of claim 17 , wherein:
the first contact sensor is disposed at or near the first close point of the first writer;
the second contact sensor is disposed at or near the second close point of the second writer; and
the third contact sensor is disposed at or near the third close point of the reader.

19. The apparatus of claim 10 , wherein a first contact sensor is coupled in series to a second contact sensor, and the series-coupled first and second contact sensors are coupled in parallel with a third contact sensor.

20. The apparatus of claim 19 , wherein:
the first contact sensor is disposed at or near the first close point of the first writer;
the second contact sensor is disposed at or near the second close point of the second writer; and
the third contact sensor is disposed at or near the third close point of the reader.

Assignees

• Seagate Technology Llc

Inventors

• Macken Declan
• Sonda Paul
• Hutchinson Erik
• Fang Jin
• Wolf John

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

• G11B5/6011

  Control of flying height · CPC title

• G11B5/024

  Erasing · CPC title

• G11B5/6076 Primary

  Detecting head-disk contact · CPC title

• G11B5/4853

  Constructional details of the electrical connection between head and arm · CPC title