Magnetic head with a main pole including first and second layers and manufacturing method for the same

Patent metadata

Field	Value
Publication number	US-10839829-B1
Application number	US-201916585640-A
Country	US
Kind code	B1
Filing date	Sep 27, 2019
Priority date	Sep 27, 2019
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A magnetic head includes a medium facing surface, a coil, a main pole, and a substrate. The main pole includes a first layer, and a second layer lying on the first layer. The first layer includes a thickness-changing portion whose dimension in a direction perpendicular to a top surface of the substrate decreases with decreasing distance to the medium facing surface. At least part of the second layer is located on the thickness-changing 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 generate a magnetic field corresponding to data to be written on the recording medium;
a main pole having an end face located on the medium facing surface, the main pole being configured to pass a magnetic flux corresponding to the magnetic field generated by the coil and to generate a write magnetic field for writing the data on the recording medium; and
a substrate having a top surface, wherein
the coil and the main pole are disposed over the top surface of the substrate,
the main pole includes a first layer including the end face, and a second layer lying on the first layer,
the first layer includes a thickness-changing portion whose dimension in a direction perpendicular to the top surface of the substrate decreases with decreasing distance to the medium facing surface, and
at least part of the second layer is located on the thickness-changing portion.

2. The magnetic head according to claim 1 , wherein
the first layer has a top surface farthest from the top surface of the substrate,
the second layer includes a front portion and a rear portion that extend along the top surface of the first layer in respective directions away from the medium facing surface,
the rear portion is located farther from the medium facing surface than the front portion,
a dimension of the front portion in a first direction orthogonal to the direction in which the front portion extends increases with increasing distance from the medium facing surface, and
a maximum dimension of the rear portion in a second direction orthogonal to the direction in which the rear portion extends is greater than or equal to a maximum dimension of the front portion in the first direction.

3. The magnetic head according to claim 1 , wherein the second layer has an end located closest to the medium facing surface and at a distance from the medium facing surface.

4. The magnetic head according to claim 3 , wherein
the first layer has a top surface farthest from the top surface of the substrate,
the top surface of the first layer includes an inclined portion that is included in the thickness-changing portion of the first layer,
the inclined portion has a rear end located farthest from the medium facing surface, and a front end located opposite to the rear end in the inclined portion,
an entirety of the inclined portion is inclined with respect to the medium facing surface and a direction perpendicular to the medium facing surface such that the rear end is located farther from the top surface of the substrate than the front end, and
the end of the second layer is located farther from the medium facing surface than the front end of the inclined portion and closer to the medium facing surface than the rear end of the inclined portion.

5. The magnetic head according to claim 3 , further comprising:
a trailing shield formed of a magnetic material and having a front end face located on the medium facing surface at a position farther from the top surface of the substrate than the end face of the main pole; and
a spin torque oscillator located between the main pole and the trailing shield and electrically connected to the main pole and the trailing shield, wherein
the first layer has a top surface farthest from the top surface of the substrate, and
at least part of the spin torque oscillator is located on the top surface of the first layer at a position closer to the medium facing surface than the end of the second layer.

6. The magnetic head according to claim 5 , wherein
the top surface of the first layer includes an inclined portion that is included in the thickness-changing portion of the first layer,
the inclined portion has a rear end located farthest from the medium facing surface, and a front end located opposite to the rear end in the inclined portion,
an entirety of the inclined portion is inclined with respect to the medium facing surface and a direction perpendicular to the medium facing surface such that the rear end is located farther from the top surface of the substrate than the front end, and
the end of the second layer is located farther from the medium facing surface than the front end of the inclined portion and closer to the medium facing surface than the rear end of the inclined portion.

7. The magnetic head according to claim 6 , wherein at least part of the spin torque oscillator is located on the inclined portion of the top surface of the first layer.

8. The magnetic head according to claim 6 , wherein
the top surface of the first layer further includes a stepped portion located closer to the medium facing surface than the inclined portion,
the stepped portion protrudes from an imaginary plane including the inclined portion in a direction away from the top surface of the substrate, and
the spin torque oscillator is disposed on the stepped portion.

9. The magnetic head according to claim 8 , further comprising an insulating layer formed of an insulating material and interposed between the spin torque oscillator and the end of the second layer, wherein
the stepped portion includes a first portion, and a second portion located farther from the medium facing surface than the first portion and closer to the imaginary plane than the first portion,
the spin torque oscillator is disposed on the first portion, and
the insulating layer is disposed on the second portion.

10. A manufacturing method of a magnetic head, the magnetic head including:
a medium facing surface configured to face a recording medium;
a coil configured to generate a magnetic field corresponding to data to be written on the recording medium;
a main pole having an end face located on the medium facing surface, the main pole being configured to pass a magnetic flux corresponding to the magnetic field generated by the coil and to generate a write magnetic field for writing the data on the recording medium; and
a substrate having a top surface, wherein
the coil and the main pole are disposed over the top surface of the substrate,
the main pole includes a first layer including the end face, and a second layer lying on the first layer,
the first layer includes a thickness-changing portion whose dimension in a direction perpendicular to the top surface of the substrate decreases with decreasing distance to the medium facing surface, and
at least part of the second layer is located on the thickness-changing portion,
the manufacturing method comprising the steps of:
forming the coil; and
forming the main pole,

wherein the step of forming the main pole includes the steps of:
forming the first layer; and
forming the second layer such that at least part of the second layer is located on the thickness-changing portion.

11. The manufacturing method of the magnetic head according to claim 10 , wherein
the first layer has a top surface farthest from the top surface of the substrate,
the second layer includes a front portion and a rear portion that extend along the top surface of the first layer in respective directions away from the medium facing surface,
the rear portion is located farther from the medium facing surface than the front portion,
a dimension of the front portion in a first direction orthogonal to the direction in which the front portion extends increases with increasing distance from the medium facing surface,
a maximum dimension of the rear portion in a second direction orthogonal to the direction in which the rear portion extends is greater than or equal to a maximum dimension of the front portion in the first direction, and
the step of forming the secon

Assignees

• Sasaki Yoshitaka
• Ito Hiroyuki
• Sato Kazuki
• Tanemura Shigeki
• Roppongi Tetsuya
• Hirata Kei
• Yamaguchi Atsushi
• Nishiyama Michitaka
• Headway Tech Inc

Inventors

• Sasaki Yoshitaka
• Ito Hiroyuki
• Sato Kazuki
• Tanemura Shigeki
• Roppongi Tetsuya
• Hirata Kei
• Yamaguchi Atsushi
• Nishiyama Michitaka

Classifications

• G11B5/3912

  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

• G11B5/3123 Primary

  by using special coil configurations or conductors · CPC title

• G11B5/265

  Structure or manufacture of a head with more than one gap for erasing, recording or reproducing on the same track (G11B5/33 takes precedence {in thin film structures G11B5/31}) · CPC title

• G11B5/1278 Primary

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

• G11B5/66

  the record carriers consisting of several layers · CPC title