Three terminal magnetic recording head

Patent metadata

Field	Value
Publication number	US-11600293-B1
Application number	US-201916559372-A
Country	US
Kind code	B1
Filing date	Sep 3, 2019
Priority date	Sep 10, 2018
Publication date	Mar 7, 2023
Grant date	Mar 7, 2023

Abstract

A magnetic recording device includes a main pole, a coil around the main pole, a trailing shield, and a leading shield. A trailing gap is between the main pole and the trailing shield. In one embodiment, the trailing gap includes a non-magnetic conductive material. In another embodiment, the trailing gap includes a spin torque oscillator device. A leading gap is between the main pole and the leading shield. The leading gap includes a non-magnetic conductive material. The main pole is coupled to a first terminal. The trailing shield coupled to a second terminal. The leading shield is coupled to a third terminal.

First claim

What is claimed is:

1. A magnetic recording device, comprising:
a main pole;
a coil around the main pole;
a trailing shield;
a trailing gap between a first surface of the main pole and the trailing shield, the trailing gap comprising a non-magnetic conductive material;
a leading shield;
a leading gap between the main pole and the leading shield, the leading gap comprising a non-magnetic conductive material disposed between a second surface of the main pole opposite the first surface and the leading shield; and
the main pole coupled to a first terminal, the trailing shield coupled to a second terminal, and the leading shield coupled to a third terminal.

2. The magnetic recording device of claim 1 , further comprising a first current path formed between the first terminal and the second terminal through the trailing shield, the trailing gap, and the main pole and a second current path formed between the first terminal and the third terminal through the leading shield, the leading gap, and the main pole.

3. The magnetic recording device of claim 2 , further comprising a power source providing a first bias current through the first terminal and the second terminal of the first current path and providing a second bias current through the first terminal and the third terminal of the second current path.

4. The magnetic recording device of claim 3 , wherein the first bias current and the second bias current are independently provided.

5. The magnetic recording device of claim 2 , wherein the first current path produces a first current assist magnetic field emanating from a media facing surface of the trailing gap and wherein the second current path produces a second current assist magnetic field emanating from a media facing surface of the leading gap.

6. The magnetic recording device of claim 1 , further comprising a first current path formed between the second terminal and the third terminal through the trailing shield, the trailing gap, the main pole, the leading gap, and leading shield and a second current path formed between the first terminal and the third terminal through the main pole, the leading gap, and the leading shield.

7. The magnetic recording device of claim 6 , wherein the first current path produces a first current assist magnetic field emanating from a media facing surface of the trailing gap and a second current assist magnetic field emanating from a media facing surface of the leading gap and wherein the second current path produces a third current assist magnetic field emanating from the media facing surface of the leading gap.

8. A magnetic recording device, comprising:
a main pole;
a coil around the main pole;
a trailing shield;
a trailing gap between the main pole and the trailing shield, the trailing gap comprising a non-magnetic conductive material;
a leading shield;
a leading gap between the main pole and the leading shield, the leading gap comprising a non-magnetic conductive material;
the main pole coupled to a first terminal, the trailing shield coupled to a second terminal, and the leading shield coupled to a third terminal;
a first current path formed between the second terminal and the third terminal through the trailing shield, the trailing gap, the main pole, the leading gap, and leading shield and a second current path formed between the first terminal and the third terminal through the main pole, the leading gap, and the leading shield; and
a power source providing a first bias current through the second terminal and the third terminal of the first current path and providing a second bias current through the first terminal and the third terminal of the second current path.

9. The magnetic recording device of claim 8 , wherein the first bias current and the second bias current are independently provided.

10. A magnetic recording device, comprising:
a main pole;
a coil around the main pole;
a trailing shield;
a spin torque oscillator device between a first surface of the main pole and the trailing shield;
a leading shield;
a leading gap between the main pole and the leading shield, the leading gap comprising a conductive non-magnetic material disposed between a second surface of the main pole opposite the first surface and the leading shield; and
the main pole coupled to a first terminal, the trailing shield coupled to a second terminal, and the leading shield coupled to a third terminal.

11. The magnetic recording device of claim 10 , further comprising a first current path formed between the first terminal and the second terminal through the trailing shield, the spin torque oscillator device, and the main pole and a second current path formed between the first terminal and the third terminal through the leading shield, the leading gap, and the main pole.

12. The magnetic recording device of claim 11 , further comprising a power source providing a first bias current through the first terminal and the second terminal of the first current path and providing a second bias current through the first terminal and the third terminal of the second current path.

13. The magnetic recording device of claim 12 , wherein the first bias current and the second bias current are independently provided.

14. The magnetic recording device of claim 11 , wherein the first current path produces a STO magnetic field emanating from a media facing surface of the spin torque oscillator device and wherein the second current path produces a current assist magnetic field emanating from a media facing surface of the leading gap.

15. The magnetic recording device of claim 10 , further comprising a first current path formed between the second terminal and the third terminal through the trailing shield, the trailing gap, the main pole, the leading gap, and leading shield and a second current path formed between the first terminal and the third terminal through the main pole, the leading gap, and the leading shield.

16. The magnetic recording device of claim 15 , wherein the first current path produces a STO magnetic field emanating from a media facing surface of the spin torque oscillator device and a first current assist magnetic field emanating from a media facing surface of the leading gap and wherein the second current path produces a second current assist magnetic field emanating from the media facing surface of the leading gap.

17. A magnetic recording device, comprising:
a main pole;
a coil around the main pole;
a trailing shield;
a spin torque oscillator device between the main pole and the trailing shield;
a leading shield;
a leading gap between the main pole and the leading shield, the leading gap comprising a conductive non-magnetic material;
the main pole coupled to a first terminal, the trailing shield coupled to a second terminal, and the leading shield coupled to a third terminal;
a first current path formed between the second terminal and the third terminal through the trailing shield, the trailing gap, the main pole, the leading gap, and leading shield and a second current path formed between the first terminal and the third terminal through the main pole, the leading gap, and the leading shield; and
a power source providing a first bias current through the second terminal and the third terminal of the first current path and providing a second bias current through the first terminal and the third terminal of the second current path.

18. The magnetic recording device of claim 17 , wherein the first bias current and the second bias current are independently provided.

19. A method of writin

Assignees

• Western Digital Tech Inc

Inventors

• Lam Terence
• Ho Michael Kuok San
• Wei Yaguang
• Bai Zhigang
• Asif Bashir Muhammad

Classifications

• G11B2005/0008

  Magnetic conditionning of heads, e.g. biasing · CPC title

• G11B5/3912 Primary

  Arrangements in which the active read-out elements are transducing in association with active magnetic shields, e.g. magnetically coupled shields (G11B5/3916 takes precedence) · CPC title

• G11B5/315

  Shield layers on both sides of the main pole, e.g. in perpendicular magnetic heads · CPC title

• G11B5/3146

  magnetic layers · CPC title

• 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