MAMR HEAD WITH A MULTI-LAYERED SIDE GAP FOR STABLE OSCILLATION OF THE STO

• US 20140177100A1
• Filed: 12/20/2012
• Published: 06/26/2014
• Est. Priority Date: 12/20/2012
• Status: Active Grant

• Current Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Original Assignee: HGST Netherlands B.V. (Western Digital Corporation)
• Inventors: Sugiyama, Mikito, Shiimoto, Masato, Nagasaka, Keiichi
• Granted Patent: US 8,988,826 B2
• Time in Patent Office: Days
• US Class Current: 360/125.03
• CPC Class Codes: G11B 2005/0024 Microwave assisted recording
• CPC Class Codes: G11B 5/1278 specially adapted for magnetisations perpendicular to the surface of the record carrier
• CPC Class Codes: G11B 5/3116 Shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect, equalizing, side flux fringing, cross talk reduction between heads or between heads and information tracks G11B5/3113, G11B5/245 take precedence

Abstract

A microwave-assisted magnetic recording (MAMR) head according to one embodiment includes a main pole; a trailing shield positioned downstream from the main pole; an oscillation device adapted to generate a high-frequency magnetic field, the oscillation device being positioned between the main pole and the trailing shield; a circuit adapted to flow an electric current therethrough to the main pole, the oscillation device, and the trailing shield; an electrically conductive non-magnetic body positioned on one or more sides of the main pole in a cross-track direction and/or a leading direction; and an insulating non-magnetic body positioned on one or more sides of the electrically conductive non-magnetic body in the cross-track direction and/or the leading direction, wherein one or more edge portions of one side of the oscillation device and one or more edge portions of one side of the main pole are in direct contact with the electrically conductive non-magnetic body.

Claims

1. A microwave-assisted magnetic recording (MAMR) head, comprising:

a main pole comprising a magnetic body adapted to generate a magnetic field for recording data on a magnetic recording medium;

a trailing shield positioned downstream from the main pole in a direction in which the magnetic recording medium advances;

an oscillation device adapted to generate a high-frequency magnetic field, the oscillation device being positioned between the main pole and the trailing shield;

a circuit adapted to flow an electric current therethrough to the main pole, the oscillation device, and the trailing shield;

an electrically conductive non-magnetic body positioned on one or more sides of the main pole in a cross-track direction and/or a leading direction; and

an insulating non-magnetic body positioned on one or more sides of the electrically conductive non-magnetic body in the cross-track direction and/or the leading direction,

wherein one or more edge portions of one side of the oscillation device and one or more edge portions of one side of the main pole are in direct contact with the electrically conductive non-magnetic body.

2. The MAMR head as recited in claim 1, wherein the electrically conductive non-magnetic body is positioned on both sides of the main pole in the cross-track direction and on a side of the main pole in the leading direction.

3. The MAMR head as recited in claim 2, wherein the insulating non-magnetic body is positioned on both sides of the electrically conductive non-magnetic body in the cross-track direction and on a side of the electrically conductive non-magnetic body in the leading direction.

4. The MAMR head as recited in claim 1, wherein the oscillation device comprises a spin torque oscillator (STO).

5. The MAMR head as recited in claim 1, wherein edge portions of the one side of the oscillation device, other than the one or more edge portions in direct contact with the electrically conductive non-magnetic body, are in direct contact with the main pole.

6. The MAMR head as recited in claim 1, further comprising a second oscillation device, the two oscillation devices being positioned in direct contact with two edge portions of one side of the main pole, the two edge portions being separated in the cross-track direction by an insulating material therebetween in direct contact with the main pole.

7. The MAMR head as recited in claim 6, wherein the two oscillation devices are also in direct contact with the electrically conductive non-magnetic body at outer sides thereof from a center of the main pole in the track-width direction.

8. A magnetic data storage system, comprising:

at least one MAMR head as recited in claim 1;

a magnetic medium;

a drive mechanism for passing the magnetic medium over the at least one MAMR head; and

a controller electrically coupled to the at least one MAMR head for controlling operation of the at least one MAMR head.

9. A microwave-assisted magnetic recording (MAMR) head, comprising:

a main pole configured to generate a magnetic field for recording data on a magnetic recording medium;

a trailing shield positioned downstream from the main pole in a direction in which the magnetic recording medium advances;

a spin torque oscillator (STO) configured to generate a high-frequency magnetic field, the STO being positioned between the main pole and the trailing shield;

an electrically conductive non-magnetic body positioned on one or more sides of the main pole in a cross-track direction and/or a leading direction; and

an insulating non-magnetic body positioned on one or more sides of the electrically conductive non-magnetic body in the cross-track direction and/or the leading direction,

wherein one or more edge portions of one side of the STO and one or more edge portions of one side of the main pole are in direct contact with the electrically conductive non-magnetic body, and

wherein all edge portions of one side of the STO are in direct contact with one of the main pole and the electrically conductive non-magnetic body.

10. The MAMR head as recited in claim 9, wherein the electrically conductive non-magnetic body is positioned on both sides of the main pole in the cross-track direction and on a side of the main pole in the leading direction, wherein the insulating non-magnetic body is positioned on both sides of the electrically conductive non-magnetic body in the cross-track direction and on a side of the electrically conductive non-magnetic body in the leading direction.

11. The MAMR head as recited in claim 9, wherein the main pole has two trailing corners and the STO is positioned in direct contact with only one of the trailing corners of the main pole and not in direct contact with the other trailing corner of the main pole.

12. The MAMR head as recited in claim 9, wherein only one STO is positioned between the main pole and the trailing shield.

13. The MAMR head as recited in claim 9, further comprising a second STO, the two STOs being positioned in direct contact with two edge portions of one side of the main pole, the two edge portions being separated in the cross-track direction by an insulating material therebetween in direct contact with the main pole.

14. The MAMR head as recited in claim 13, wherein the two STOs are also in direct contact with the electrically conductive non-magnetic body at outer sides thereof from a center of the main pole in the track-width direction.

15. A magnetic data storage system, comprising:

at least one MAMR head as recited in claim 9;

a magnetic medium;

a drive mechanism for passing the magnetic medium over the at least one MAMR head; and

a controller electrically coupled to the at least one MAMR head for controlling operation of the at least one MAMR head.

16. A microwave-assisted magnetic recording (MAMR) head, comprising:

a main pole comprising a magnetic body configured to generate a magnetic field for recording data on a magnetic recording medium;

a trailing shield positioned downstream from the main pole in a direction in which the magnetic recording medium advances;

a spin torque oscillator (STO) configured to generate a high-frequency magnetic field, the STO being positioned between the main pole and the trailing shield;

a circuit configured to flow an electric current therethrough to the main pole, the STO, and the trailing shield;

an electrically conductive non-magnetic body positioned on one or more sides of the main pole in a cross-track direction and/or a leading direction; and

an insulating non-magnetic body positioned on one or more sides of the electrically conductive non-magnetic body in the cross-track direction and/or the leading direction,

wherein all edge portions of one side of the STO are in direct contact with one of the main pole and the electrically conductive non-magnetic body, and

wherein only one STO is positioned between the main pole and the trailing shield.

17. The MAMR head as recited in claim 16, wherein the electrically conductive non-magnetic body is positioned on both sides of the main pole in the cross-track direction and on a side of the main pole in the leading direction, and wherein the insulating non-magnetic body is positioned on both sides of the electrically conductive non-magnetic body in the cross-track direction and on a side of the electrically conductive non-magnetic body in the leading direction.

18. The MAMR head as recited in claim 17, wherein the main pole has two trailing corners and the STO is positioned in direct contact with only one of the trailing corners of the main pole and not in direct contact with the other trailing corner of the main pole.

19. The MAMR head as recited in claim 18, wherein the STO is also in direct contact with the electrically conductive non-magnetic body at an outer side thereof from a center of the main pole in the track-width direction.

20. A magnetic data storage system, comprising:

at least one MAMR head as recited in claim 16;

a magnetic medium;

a drive mechanism for passing the magnetic medium over the at least one MAMR head; and

a controller electrically coupled to the at least one MAMR head for controlling operation of the at least one MAMR head.