Magnetic head for perpendicular magnetic recording with a coil including a first winding portion of one turn and a second winding portion of less than one turn

Patent metadata

Field	Value
Publication number	US-9704513-B2
Application number	US-201514930084-A
Country	US
Kind code	B2
Filing date	Nov 2, 2015
Priority date	Nov 2, 2015
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A magnetic head includes a coil, a main pole and a return path section. The return path section is located on the trailing side relative to the main pole so that a space is defined between the main pole and itself. The coil includes a first winding portion and a second winding portion connected in series. The first winding portion extends to pass through the aforementioned space, and extends once around the entire perimeter of the main pole as viewed from the medium facing surface. The second winding portion does not pass through the aforementioned space, and surrounds only a part of the entire perimeter of the main pole as viewed from the medium facing surface.

First claim

What is claimed is:

1. A magnetic head for perpendicular magnetic recording, comprising:
a medium facing surface configured to face a recording medium;
a coil for producing a magnetic field corresponding to data to be written on the recording medium;
a main pole having an end face located in the medium facing surface, the main pole being configured to pass a magnetic flux corresponding to the magnetic field produced by the coil, and to produce a write magnetic field for use to write the data on the recording medium by means of a perpendicular magnetic recording system; and
a first return path section formed of a magnetic material, wherein
the first return path section includes a first yoke section and a first coupling section, and defines a first space between the main pole and itself, the first yoke section being located on a front side in a direction of travel of the recording medium relative to the main pole, the first coupling section being located away from the medium facing surface and coupling the first yoke section to the main pole,
the first coupling section has a first contact surface in contact with the main pole,
the coil includes a first winding portion and a second winding portion connected in series,
the first winding portion includes a first coil element extending to pass through the first space, and extends once around an entire perimeter of the first coupling section,
the second winding portion extends less than once around the entire perimeter of the first coupling section, thus surrounding only ½ to ¾ of the entire perimeter of the first coupling section, and
no portion of the coil except the first coil element lies in the first space.

2. The magnetic head for perpendicular magnetic recording according to claim 1 , further comprising a second return path section formed of a magnetic material, wherein
the second return path section includes a second yoke section and a second coupling section, and defines a second space between the main pole and itself, the second yoke section being located on a rear side in the direction of travel of the recording medium relative to the main pole, the second coupling section being located away from the medium facing surface and coupling the second yoke section to the main pole,
the second coupling section has a second contact surface in contact with the main pole,
the coil further includes a third winding portion, and
the third winding portion extends to pass through the second space and surrounds at least part of an entire perimeter of the second coupling section.

Assignees

• Sasaki Yoshitaka
• Ito Hiroyuki
• Sato Kazuki
• Ikegawa Yukinori
• Tanemura Shigeki
• Takano Kenichi
• Headway Tech Inc

Inventors

• Sasaki Yoshitaka
• Ito Hiroyuki
• Sato Kazuki
• Ikegawa Yukinori
• Tanemura Shigeki
• Takano Kenichi

Classifications

• G11B5/1278

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

• G11B5/3123

  by using special coil configurations or conductors · CPC title

• G11B5/17 Primary

  Construction or disposition of windings · CPC title