Magnetic recording head and magnetic recording and reproducing device

Patent metadata

Field	Value
Publication number	US-9349389-B2
Application number	US-201514809494-A
Country	US
Kind code	B2
Filing date	Jul 27, 2015
Priority date	Jul 30, 2014
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

According to one embodiment, a magnetic recording head records information in a magnetic recording medium by shingled magnetic recording. The magnetic recording head includes a magnetic pole and a shield opposing the magnetic pole. The magnetic pole has a shield-opposing surface opposing the shield. The shield-opposing surface includes a first portion and a second portion. A position of the second portion in a track width direction is different from a position of the first portion in the track width direction, the track width direction intersecting a first direction from the magnetic pole toward the shield. The first portion records the information in the magnetic recording medium after the second portion in the shingled magnetic recording. A first distance between the first portion and the shield is shorter than a second distance between the second portion and the shield. The shield-opposing surface is tilted with respect to the first direction.

First claim

What is claimed is:

1. A magnetic recording head, comprising:
a magnetic pole; and
a shield opposing the magnetic pole,
the magnetic recording head recording information in a magnetic recording medium by shingled magnetic recording,
the magnetic pole having a shield-opposing surface opposing the shield,
the shield-opposing surface including a first portion and a second portion,
a position of the second portion in a track width direction being different from a position of the first portion in the track width direction, the track width direction intersecting a first direction from the magnetic pole toward the shield,
the first portion recording the information in the magnetic recording medium after the second portion in the shingled magnetic recording,
a first distance between the first portion and the shield being shorter than a second distance between the second portion and the shield,
the shield-opposing surface being tilted with respect to the first direction,
wherein a ratio of a difference between the first distance and the second distance to a width in the track width direction of the shield-opposing surface is not less than 0.03 and not more than 0.18.

2. The head according to claim 1 , wherein the first portion includes one end in the track width direction.

3. The head according to claim 1 , wherein an angle between the shield-opposing surface and the first direction is not less than 81 degrees and not more than 88 degrees.

4. The head according to claim 1 , wherein an angle between the shield-opposing surface and the first direction is not less than 83 degrees and not more than 86.5 degrees.

5. The head according to claim 1 , wherein the shield-opposing surface is a plane.

6. The head according to claim 1 , wherein the shield-opposing surface is a curved surface tilted with respect to the first direction.

7. The head according to claim 1 , wherein the shield-opposing surface includes a plurality of stepped portions.

8. The head according to claim 1 , wherein
the magnetic pole includes a first end region, and a second end region provided between the first end region and the shield, and
a width in the track width direction of the second end region is wider than a width in the track width direction of the first end region.

9. The head according to claim 1 , wherein the shield is a trailing shield.

10. A magnetic recording head, comprising:
a magnetic pole; and
a shield opposing the magnetic pole,
the magnetic recording head recording information in a magnetic recording medium,
the magnetic pole having a shield-opposing surface opposing the shield,
the shield-opposing surface including a first portion and a second portion,
a position of the second portion in a track width direction being different from a position of the first portion in the track width direction, the track width direction intersecting a first direction from the magnetic pole toward the shield,
the magnetic recording medium including first to third regions arranged in the track width direction, the second region being disposed between the first region and the third region,
the magnetic pole controlling a direction of a magnetization of the first region by the first portion opposing the first region at a first time,
the magnetic pole controlling a direction of a magnetization of the second region by the second portion opposing the second region at the first time,
the magnetic pole controlling the direction of the magnetization of the second region by the first portion opposing the second region at a second time after the first time,
the magnetic pole controlling a direction of a magnetization of the third region by the second portion opposing the third region at the second time,
a first distance between the first portion and the shield being shorter than a second distance between the second portion and the shield,
the shield-opposing surface being tilted with respect to the first direction.

11. The head according to claim 10 , wherein a ratio of a difference between the first distance and the second distance to a width in the track width direction of the shield-opposing surface is not less than 0.03 and not more than 0.18.

12. The head according to claim 10 , wherein the first portion includes one end in the track width direction.

13. The head according to claim 10 , wherein an angle between the shield-opposing surface and the first direction is not less than 81 degrees and not more than 88 degrees.

14. The head according to claim 10 , wherein
the shield has a magnetic pole-opposing surface opposing the magnetic pole, and
the magnetic pole-opposing surface is perpendicular to the first direction.

15. A magnetic recording head, comprising:
a magnetic pole; and
a shield opposing the magnetic pole,
the magnetic recording head recording information in a magnetic recording medium by shingled magnetic recording,
the magnetic pole having a shield-opposing surface opposing the shield,
the shield-opposing surface including a first portion and a second portion,
a position of the second portion in a track width direction being different from a position of the first portion in the track width direction, the track width direction intersecting a first direction from the magnetic pole toward the shield,
the first portion recording the information in the magnetic recording medium after the second portion in the shingled magnetic recording,
a first distance between the first portion and the shield being shorter than a second distance between the second portion and the shield,
the shield-opposing surface being tilted with respect to the first direction, wherein
the shield has a magnetic pole-opposing surface opposing the magnetic pole, and
the magnetic pole-opposing surface is perpendicular to the first direction.

16. The head according to claim 15 , wherein the magnetic pole-opposing surface is a plane.

17. The head according to claim 15 , wherein an angle between a plane including the shield-opposing surface and a plane including the magnetic pole-opposing surface is not less than 2 degrees and not more than 9 degrees.

18. The head according to claim 15 , wherein an angle between a plane including the shield-opposing surface and a plane including the magnetic pole-opposing surface is not less than 3.5 degrees and not more than 7 degrees.

19. A magnetic recording and reproducing device, comprising:
a magnetic recording head; and
a magnetic recording medium,
the magnetic recording medium being a perpendicular magnetic recording medium
the magnetic recording head including:
a magnetic pole; and
a shield opposing the magnetic pole,
the magnetic recording head recording information in a magnetic recording medium by shingled magnetic recording,
the magnetic pole having a shield-opposing surface opposing the shield,
the shield-opposing surface including a first portion and a second portion,
a position of the second portion in a track width direction being different from a position of the first portion in the track width direction, the track width direction intersecting a first direction from the magnetic pole toward the shield,
the first portion recording the information in the magnetic recording medium after the second portion in the shingled magnetic recording,
a first distance between the first portion and the shield being shorter than a second distance between the second portion and the shield,

the shield-opposing surface being tilted with respect to the first direction,
wherein a ratio of a difference between

Assignees

• Toshiba Kk

Inventors

• Takagishi Masayuki
• Yamada Kenichiro
• Maeda Tomoyuki
• Sugawara Katsuya

Classifications

• G11B5/11 Primary

  Shielding of head against electric or magnetic fields · CPC title

• G11B5/1278

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

• G11B5/315

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

• G11B5/3116

  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) · CPC title