Optimized dual thermal fly-height design for dual writers for advanced magnetic recording

Patent metadata

Field	Value
Publication number	US-11087789-B1
Application number	US-202016831728-A
Country	US
Kind code	B1
Filing date	Mar 26, 2020
Priority date	Mar 26, 2020
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The magnetic recording head comprises a first write head and a second write head each coupled to a first pad and a second pad of a slider pad and an electrical circuit coupled to the first and second pads. The first write head comprises a first main pole and a first thermal fly height (TFH) element, and the second write head comprises a second main pole and a second TFH element. The electrical circuit comprises a capacitor and a connection to the first TFH element of the first write head, and an inductor and a connection to the second TFH element of the second write head. The electrical circuit is configured to independently power the first TFH element and the second TFH element.

First claim

What is claimed is:

1. A magnetic recording head, comprising:
a slider pad;
a first write head comprising a first main pole and a first thermal fly height element, wherein the first write head is coupled to the slider pad by a first pad and a second pad;
a second write head disposed adjacent to the first write head, the second write head comprising a second main pole and a second thermal fly height element, wherein the second write head is coupled to the slider pad by the first pad and the second pad; and
an electrical circuit coupled to the first and second pads, the electrical circuit comprising a capacitor, an inductor, a first connection to the first thermal fly height element, and a second connection to the second thermal fly height element, wherein the electrical circuit is configured to independently power the first thermal fly height element and the second thermal fly height element.

2. The magnetic recording head of claim 1 , wherein applying AC current to the electrical circuit powers the first thermal fly height element through the capacitor and the first connection to the first write head.

3. The magnetic recording head of claim 1 , wherein applying DC current to the electrical circuit powers the second thermal fly height element through the inductor and the second connection to the second write head.

4. The magnetic recording head of claim 1 , wherein applying both AC and DC current to the electrical circuit powers both the first thermal fly height element and the second thermal fly height element.

5. The magnetic recording head of claim 1 , wherein the inductor has a pancake coil structure.

6. The magnetic recording head of claim 5 , wherein the inductor comprises a coil wrapped around a magnetic material about 16 times, and wherein the inductor has an area of about 24 μm 2 .

7. The magnetic recording head of claim 1 , wherein the first main pole of the first write head has a shorter height from a trailing edge of the first main pole to a leading edge of the first main pole than the second main pole of the second write head, and wherein the first main pole has a greater width in the cross-the-track direction than the second main pole.

8. A data storage device comprising the magnetic recording head of claim 1 .

Assignees

• Western Digital Tech Inc

Inventors

• Le Quang
• Luo Jih-Shiuan
• Nguyen Thao A
• Ho Kuok San

Classifications

• G11B5/607 Primary

  using thermal means · CPC title

• G11B5/6023

  using inductive measurement · CPC title

• G11B5/6017 Primary

  using capacitive measurement · CPC title

• G11B5/4826

  Mounting, aligning or attachment of the transducer head relative to the arm assembly, e.g. slider holding members, gimbals, adhesive (G11B5/484 takes precedence; details of head housings or structures G11B5/10, G11B5/127; adjustment relative to the record carrier G11B5/56) · CPC title

• G11B5/02

  Recording, reproducing, or erasing methods; Read, write or erase circuits therefor · CPC title