Magnetic recording head and disk device having the same

Patent metadata

Field	Value
Publication number	US-2018075868-A1
Application number	US-201715445822-A
Country	US
Kind code	A1
Filing date	Feb 28, 2017
Priority date	Sep 12, 2016
Publication date	Mar 15, 2018
Grant date	—

Abstract

A magnetic recording head includes a main magnetic pole extending to an air bearing surface of the magnetic recording head and having an end portion that is exposed at the air bearing surface, a magnetic shield having an end portion that is exposed at the air bearing surface and faces the end portion of the main magnetic pole with a gap therebetween, a stacked-layer element disposed in the gap, and including a first conductive layer in contact the main magnetic pole, a second conductive layer in contact with the magnetic shield, and an magnetic permeability adjusting layer disposed between the first conductive layer and the second conductive layer, and first and second terminals between which a current flows through the main magnetic pole, the stacked-layer element, and the magnetic shield when the current is supplied to one of the terminals.

First claim

1 .- 4 . (canceled)

5 . A magnetic recording head comprising:
a main magnetic pole extending to an air bearing surface of the magnetic recording head and having an end portion that is exposed at the air bearing surface; a magnetic shield having an end portion that is exposed at the air bearing surface and faces the end portion of the main magnetic pole with a gap therebetween; a stacked-layer element disposed in the gap, and including a first conductive layer in contact with the end portion of the main magnetic pole, a second conductive layer in contact with the end portion of the magnetic shield, and a magnetic permeability adjusting layer formed of a magnetic material containing at least one of iron, cobalt, and nickel and disposed between the first conductive layer and the second conductive layer; and first and second terminals between which a current flows through the main magnetic pole, the stacked-layer element, and the magnetic shield when the current is supplied to one of the terminals, wherein a distance between the stacked-layer element and the air bearing surface is greater than 2 nm.

6 . The magnetic recording head according to claim 5 , wherein
the magnetic recording head further includes an insulating layer that covers a side of the stacked-layer element that faces the air bearing surface, in the gap, and forms a part of the air baring surface.

7 . The magnetic recording head according to claim 5 , wherein
a distance between the air baring surface and the stacked-layer element is greater than a width of the gap.

8 . The magnetic recording head according to claim 5 , wherein
the first conductive layer is formed of metal or metal alloy, including at least one of Cu, Au, Ag, Al, Ir, and NiAl alloy, and the second conductive layer is formed of metal or metal alloy, including at least one of Ta, Ru, Pt, W, and Mo.

9 . The magnetic recording head according to claim 5 , wherein
the first conductive layer is formed of metal or metal alloy, including at least one of Ta, Ru, Pt, W, and Mo, and the second conductive layer is formed of metal or metal alloy, including at least one of Cu, Au, Ag, Al, Ir, and NiAl alloy.

10 . The magnetic recording head according to claim 5 , wherein
a product of the thickness and a saturation magnetic flux density of the magnetic permeability adjusting layer is equal to or less than 20 nmT.

11 .- 14 . (canceled)

15 . A magnetic disk device comprising:
a rotatable disk including a magnetic recording layer; and a magnetic recording head including a main magnetic pole extending to an air bearing surface of the magnetic recording head and having an end portion that is exposed at the air bearing surface, a magnetic shield having an end portion that is exposed at the air bearing surface and faces the end portion of the main magnetic pole with a gap therebetween, and a stacked-layer element disposed in the gap, and including a first conductive layer in contact with the end portion of the main magnetic pole, a second conductive layer in contact with the end portion of the magnetic shield, and an magnetic permeability adjusting layer formed of a magnetic material containing at least one of iron, cobalt, and nickel and disposed between the first conductive layer and the second conductive layer, wherein when data are written in the magnetic recording layer, a current flows through the main magnetic pole, the stacked-layer element, and the magnetic shield, and a distance between the stacked-layer element and the air bearing surface is greater than 2 nm.

16 . The magnetic disk device according to claim 15 , wherein
the magnetic recording head further includes an insulating layer that covers a side of the stacked-layer element that faces the air bearing surface, in the gap, and forms a part of the air baring surface.

17 . The magnetic disk device according to claim 15 , wherein
a distance between the air baring surface and the stacked-layer element is equal to or greater than a width of the gap.

18 . The magnetic disk device according to claim 15 , wherein
the first conductive layer is formed of metal or metal alloy, including at least one of Cu, Au, Ag, Al, Ir, and NiAl alloy, and the second conductive layer is formed of metal or metal alloy, including at least one of Ta, Ru, Pt, W, and Mo.

19 . The magnetic disk device according to claim 15 , wherein
the first conductive layer is formed of metal or metal alloy, including at least one of Ta, Ru, Pt, W, and Mo, and the second conductive layer is formed of metal or metal alloy, including at least one of Cu, Au, Ag, Al, Ir, and NiAl alloy.

20 . The magnetic disk device according to claim 15 , wherein
a thickness of the magnetic permeability adjusting layer is 1 to 5 nm, and a product of the thickness and a saturation magnetic flux density of the magnetic permeability adjusting layer is equal to or less than 20 nmT.

Assignees

• Toshiba Kk

Inventors

• Koui Katsuhiko
• Yamada Kenichiro
• Taguchi Tomoko

Classifications

• G11B5/1278

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

• G11B5/1871

  Shaping or contouring of the transducing or guiding surface · CPC title

• G11B5/3912 Primary

  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

• G11B5/23

  Gap features {(G11B5/1871, G11B5/1875, G11B5/265, G11B5/29, G11B5/488 and subgroups, G11B5/4907 and subgroups, G11B5/4969 and subgroups take precedence)} · CPC title

• G11B2005/0024

  Microwave assisted recording · CPC title