Unlock instant, AI-driven research and patent intelligence for your innovation.

Magnetic head for perpendicular magentic recording capable of preventing unwanted erasure

a magnetic recording and perpendicular magnetic technology, applied in the direction of magnetic recording heads, data recording, instruments, etc., can solve the problems of affecting the quality of the magnetic recording, the occurrence of leakage magnetic field, and the inability to smoothly proceed with the displacement of the domain wall, so as to prevent the occurrence of unwanted erasure

Active Publication Date: 2017-05-18
HEADWAY TECH INC
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017]It is an object of the present invention to provide a magnetic head for perpendicular magnetic recording and its manufacturing method that can prevent the occurrence of unwanted erasure.
[0035]In the magnetic head of the present invention, at least part of the first portion of the first return path section is interposed between the medium facing surface and the front end face of the first coil element, and at least part of the second portion of the first return path section is interposed between the first portion and the front end face of the first coil element. By virtue of such a configuration, it is possible to form the first portion such that most part of the first portion has a uniform crystal growth direction. The present invention thereby makes it possible to prevent the occurrence of unwanted erasure.

Problems solved by technology

Such a trailing shield has a greater number of grain boundaries and defects.
In such a trailing shield, magnetization rotation and domain wall displacement cannot smoothly proceed, and leakage magnetic field is thus likely to occur from the end face of the trailing shield toward the outside of the medium facing surface.
This results in the problem of the occurrence of unwanted erasure.
The aforementioned problem occurs also when the coil element has a front end face parallel to the medium facing surface, instead of the first inclined surface.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Magnetic head for perpendicular magentic recording capable of preventing unwanted erasure
  • Magnetic head for perpendicular magentic recording capable of preventing unwanted erasure
  • Magnetic head for perpendicular magentic recording capable of preventing unwanted erasure

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0061]Preferred embodiments of the present invention will now be described in detail with reference to the drawings. First, reference is made to FIG. 2 to FIG. 5 to describe the configuration of a magnetic head for perpendicular magnetic recording (hereinafter simply referred to as magnetic head) according to a first embodiment of the invention. FIG. 2 is a cross-sectional view of the magnetic head according to the present embodiment. The arrow labeled T in FIG. 2 indicates the direction of travel of a recording medium. FIG. 3 is a front view showing the medium facing surface of the magnetic head according to the present embodiment. FIG. 4 is a plan view showing a second coil portion of the magnetic head according to the present embodiment. FIG. 5 is a plan view showing a first coil portion of the magnetic head according to the present embodiment. In FIG. 3 to FIG. 5 the arrow labeled TW indicates the track width direction.

[0062]The magnetic head according to the present embodiment ...

second embodiment

[0145]A magnetic head according to a second embodiment of the present invention will now be described with reference to FIG. 19. FIG. 19 is a cross-sectional view showing the main part of the magnetic head according to the present embodiment. FIG. 19 shows a cross section perpendicular to the medium facing surface and to the top surface of the substrate, particularly the main cross section. The arrow labeled Tin FIG. 19 indicates the direction of travel of the recording medium.

[0146]The magnetic head according to the present embodiment differs from the magnetic head according to the first embodiment in the following ways. In the present embodiment, the nonmagnetic layer 67 is not provided. Further, the first return path section 40 of the present embodiment includes a second portion 48, a connection section 42, an electrode film 46 formed of a nonmagnetic metal material, and a nonmagnetic film 47 formed of a nonmagnetic material, in place of the second portion 44, the connection sect...

third embodiment

[0161]A magnetic head according to a third embodiment of the invention will now be described with reference to FIG. 22. FIG. 22 is a cross-sectional view showing the main part of the magnetic head according to the present embodiment. FIG. 22 shows a cross section perpendicular to the medium facing surface and to the top surface of the substrate, particularly the main cross section. The arrow labeled T in FIG. 22 indicates the direction of travel of the recording medium.

[0162]The magnetic head according to the present embodiment differs from the magnetic head according to the second embodiment in the following ways. The first return path section 40 of the present embodiment includes a third portion 49 in addition to the first portion 43, the second portion 48, the connection section 42, the electrode film 46 and the nonmagnetic film 47. The third portion 49 is formed of the second magnetic material described in relation to the first embodiment. In FIG. 22, the hollow arrows indicate ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
heightaaaaaaaaaa
Login to View More

Abstract

A magnetic head includes a coil, a main pole, a write shield, and a return path section. The coil includes a coil element located on the trailing side of the main pole. The coil element has a front end face facing toward the medium facing surface. The return path section includes a first portion, a second portion, and an intermediate film interposed between the first portion and the second portion. Part of the first portion is interposed between the medium facing surface and the front end face of the coil element. Part of the second portion is interposed between the first portion and the front end face of the coil element.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a magnetic head for perpendicular magnetic recording for use to write data on a recording medium by means of a perpendicular magnetic recording system.[0003]2. Description of the Related Art[0004]The recording systems of magnetic read / write apparatuses include a longitudinal magnetic recording system in which the magnetization of signals is directed along the plane of a recording medium (the longitudinal direction), and a perpendicular magnetic recording system in which the magnetization of signals is directed perpendicular to the plane of a recording medium. It is known that the perpendicular magnetic recording system is harder to be affected by thermal fluctuation of the recording medium and capable of providing higher linear recording density, compared with the longitudinal magnetic recording system.[0005]Magnetic heads for perpendicular magnetic recording typically have, like those f...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): G11B5/127G11B5/17G11B5/39
CPCG11B5/1278G11B5/17G11B5/3912G11B5/115G11B5/3116G11B5/3123G11B5/3146G11B5/3163
Inventor SASAKI, YOSHITAKAITO, HIROYUKISATO, KAZUKITANEMURA, SHIGEKIIKEGAWA, YUKINORITAKANO, KENICHI
Owner HEADWAY TECH INC