Magnetic head including a main pole and a write shield

Patent metadata

Field	Value
Publication number	US-10586558-B1
Application number	US-201916267803-A
Country	US
Kind code	B1
Filing date	Feb 5, 2019
Priority date	Feb 5, 2019
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

A magnetic head includes a main pole and a write shield. The write shield includes a bottom shield, a first side shield and a second side shield. The first side shield has first and second sidewalls. The second side shield has third and fourth sidewalls. Each of the second and fourth sidewalls has a top edge farthest from a top surface of a substrate. The top edge of each of the second and fourth sidewalls is parallel to a medium facing surface. A portion of a top surface of the bottom shield, the first sidewall, and the third sidewall define a receiving section to receive a portion of the main pole. The receiving section has a bottom including a first inclined portion, a second inclined portion, and a third inclined portion.

First claim

What is claimed is:

1. A magnetic head comprising:
a medium facing surface configured to face a recording medium;
a coil configured to produce a magnetic field corresponding to data to be written on the recording medium;
a main pole configured to pass a magnetic flux corresponding to the magnetic field produced by the coil, and to produce a write magnetic field for writing the data on the recording medium;
a write shield formed of a magnetic material;
a gap section formed of a nonmagnetic material; and
a substrate having a top surface, wherein
the coil, the main pole, the write shield, and the gap section are disposed above the top surface of the substrate,
the write shield includes a bottom shield, a first side shield, and a second side shield,
the gap section is interposed between the main pole and each of the bottom shield, the first side shield and the second side shield,
the bottom shield has a top surface farthest from the top surface of the substrate,
the first and second side shields are located farther from the top surface of the substrate than the bottom shield, and are on opposite sides of the main pole in a track width direction,
the first side shield has a first front end face located in the medium facing surface, and a first sidewall and a second sidewall facing the main pole,
the first sidewall is connected to the first front end face,
the second sidewall is located farther from the medium facing surface than the first sidewall,
the second side shield has a second front end face located in the medium facing surface, and a third sidewall and a fourth sidewall facing the main pole,
the third sidewall is connected to the second front end face,
the fourth sidewall is located farther from the medium facing surface than the third sidewall,
each of the second and fourth sidewalls has a top edge farthest from the top surface of the substrate, and a bottom edge closest to the top surface of the substrate,
the top edge of each of the second and fourth sidewalls is substantially parallel to the medium facing surface,
the bottom shield and the first and second side shields are configured so that a portion of the top surface of the bottom shield, the first sidewall, and the third sidewall define a receiving section to receive a portion of the main pole,
the main pole has an end face located in the medium facing surface, a top surface farthest from the top surface of the substrate, a bottom end opposite to the top surface, and a first, a second, a third and a fourth side surface,
the first side surface is opposed to the first sidewall,
a portion of the second side surface is opposed to the second sidewall,
the third side surface is opposed to the third sidewall,
a portion of the fourth side surface is opposed to the fourth sidewall,
the receiving section has a bottom which is constituted by the portion of the top surface of the bottom shield and opposed to a portion of the bottom end of the main pole,
the bottom includes a first inclined portion, a second inclined portion, and a third inclined portion arranged in this order, the first inclined portion being closest to the medium facing surface,
the second inclined portion is located closer to the top surface of the substrate than the first inclined portion,
the third inclined portion is located closer to the top surface of the substrate than the second inclined portion,
a distance from the top surface of the substrate to any point on each of the first and third inclined portions decreases with increasing distance from the point to the medium facing surface,
the second inclined portion is inclined with respect to the first inclined portion such that an angle that the second inclined portion forms with respect to the top surface of the substrate is greater than an angle that the first inclined portion forms with respect to the top surface of the substrate,
the third inclined portion is inclined with respect to the second inclined portion such that an angle that the third inclined portion forms with respect to the top surface of the substrate is smaller than the angle that the second inclined portion forms with respect to the top surface of the substrate, and
the bottom end of the main pole includes a first portion opposed to the first inclined portion, a second portion opposed to the second inclined portion, and a third portion opposed to the third inclined portion.

2. The magnetic head according to claim 1 , wherein the first portion is substantially parallel to the first inclined portion, the second portion is substantially parallel to the second inclined portion, and the third portion is substantially parallel to the third inclined portion.

3. The magnetic head according to claim 1 , wherein a distance from the bottom edge of each of the second and fourth sidewalls to the medium facing surface is substantially equal to a distance from a boundary between the first and second inclined portions to the medium facing surface.

4. The magnetic head according to claim 3 , wherein the distance from the bottom edge of each of the second and fourth sidewalls to the medium facing surface and the distance from the boundary between the first and second inclined portions to the medium facing surface fall within a range of 10 to 60 nm.

5. The magnetic head according to claim 1 , wherein, in any cross section intersecting the first and third sidewalls and parallel to the medium facing surface, a distance between the first sidewall and the third sidewall in the track width direction decreases with increasing proximity to the top surface of the substrate, and a distance between the first side surface and the third side surface in the track width direction decreases with increasing proximity to the top surface of the substrate.

6. A manufacturing method for a magnetic head, the magnetic head comprising:
a medium facing surface configured to face a recording medium;
a coil configured to produce a magnetic field corresponding to data to be written on the recording medium;
a main pole configured to pass a magnetic flux corresponding to the magnetic field produced by the coil, and to produce a write magnetic field for writing the data on the recording medium;
a write shield formed of a magnetic material;
a gap section formed of a nonmagnetic material; and
a substrate having a top surface, wherein
the coil, the main pole, the write shield, and the gap section are disposed above the top surface of the substrate,
the write shield includes a bottom shield, a first side shield, and a second side shield,
the gap section is interposed between the main pole and each of the bottom shield, the first side shield and the second side shield,
the bottom shield has a top surface farthest from the top surface of the substrate,
the first and second side shields are located farther from the top surface of the substrate than the bottom shield, and are on opposite sides of the main pole in a track width direction,
the first side shield has a first front end face located in the medium facing surface, and a first sidewall and a second sidewall facing the main pole,
the first sidewall is connected to the first front end face,
the second sidewall is located farther from the medium facing surface than the first sidewall,
the second side shield has a second front end face located in the medium facing surface, and a third sidewall and a fourth sidewall facing the main pole,
the third sidewall is connected to the second front end face,
the fourth sidewall is located farther from the medium facing surface than the third sidewall,
each of the second and fourth sidewalls has a top edge farthest from the top surface of the substrate, and a bottom edge closest to the top surface of the substrate,
the top edge of each of the second and

Assignees

• Sasaki Yoshitaka
• Ito Hiroyuki
• Sato Kazuki
• Tanemura Shigeki
• Araki Hironori
• Yamaguchi Atsushi
• Hirata Kei
• Headway Tech Inc

Inventors

• Sasaki Yoshitaka
• Ito Hiroyuki
• Sato Kazuki
• Tanemura Shigeki
• Araki Hironori
• Yamaguchi Atsushi
• Hirata Kei

Classifications

• 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

• G11B5/1272

  Assembling or shaping of elements (G11B5/1278 takes precedence) · CPC title

• G11B5/3116 Primary

  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

• G11B5/11 Primary

  Shielding of head against electric or magnetic fields · CPC title