JPS598114A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve the S/N of a magnetic head and to enhance the track density, by forming magnetic poles thicker than an R/W magnetic pole on both sides of the R/W magnetic pole. CONSTITUTION:The magnetic head consists of an R/W magnetic pole 14 and an E magnetic pole 15. A width 17 of the R/W magnetic pole corresponds to the track width of recording approximately, and a width 16 of the E magnetic pole corresponds to the width of erasing approximately. As an example of application of this magnetic head, the magnetic head is arranged in the position of a main magnetic pole in the constitution where the main magnetic pole and an auxiliary magnetic pole are used to perform vertical magnetic recording. When the magnetic head is used in this manner, the magnetic flux which overflows from the recording track and is picked up by the R/W magnetic pole at the reproducing time approximates zero and the variation of the magnetic flux which is picked up by the E magnetic pole at the reproducing time approximates zero by the thickness loss of the E magnetic pole even if the position of the R/W magnetic pole at the recording time and that at the reproducing time are shifted from each other. Thus, the S/N is improved, and the track density is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head for recording a magnetization pattern in a direction substantially perpendicular to the surface of a recording medium, and in particular to a magnetic head for recording a magnetization pattern in a direction substantially perpendicular to the surface of a recording medium.
Regarding the structure of the K magnetic pole.

Purpose of the present invention FiREAD/WRITE magnetic pole (hereinafter Ft
The purpose is to provide a thicker magnetic layer (hereinafter referred to as Kak) on both sides of the 1c R/'W magnetic pole (hereinafter referred to as Kak) to produce the ERASK effect with a simple manufacturing process.

Conventionally, a structure as shown in FIG. 1 has been proposed as a magnetic head for a system in which magnetization is recorded in a direction perpendicular to the surface of a recording medium (hereinafter referred to as perpendicular magnetic recording). 1-digit auxiliary magnetic pole, excitation coil wound around 2-digit auxiliary magnetic pole, 3 is the recording medium, 4-digit main magnetic pole, 5 is the moving direction of the recording medium.The principle of recording is that the excitation coil is wound around the auxiliary magnetic pole 1. A magnetic field is generated by passing a current through the coil, and the recording medium is magnetized by the magnetic field of the magnetic charge at the tip of the main magnetic pole. During reproduction, the main magnetic pole is magnetized by the magnetization of the recording medium, and the change in the magnetic flux generated is It is detected by the coil 2.The R/W magnetic pole described in the present invention is almost the same as the main magnetic pole 4 in Fig. 1.The arrow inside the recording medium 3 simply shows the state of the magnetization pattern to be recorded. As an application of such perpendicular magnetic recording, a floppy disk drive device is considered in which the recording medium is flexible and has a thin disc shape, and records are performed in the circumferential direction on concentric circles.

In particular, the advantage of perpendicular magnetic recording is that the recording bit density can be increased. There have been no reports that it is possible to achieve a cotton density of 100 kilobits per inch (9+). However, when applied to a floppy disk drive device, in order to increase the track density, it is necessary to provide a KFIAsB head as in conventional devices.

The present invention provides a magnetic envelope head with an E magnetic pole having an ERASE effect through a simple manufacturing process.
There is C. The details of Mizumoto will be explained below, including examples.

FIG. 2 shows an embodiment of the present invention, showing only a portion in contact with the surface of the recording medium. 14 digits F magnetic pole, 15 is E magnetic pole,
R/W *The width of the pole is 17, which roughly corresponds to the track width of the recording. If the width of the E magnetic pole is 16, it is #'JEFIAS.
E@; [Correspond. 19 ke R/'W magnetic S thickness is uniform,
20 is the thickness of the E magnetic pole. As an example of the application of the magnetic head according to the present invention, a configuration as shown in FIG. 1 can be considered.

That is, the magnetic head according to the present invention (FIG. 2) may be placed at the position of the main magnetic pole 4. The operation of the magnetic head according to the present invention will now be described.

FIG. 3 shows the vertical component of the magnetic field strength distribution when the magnetic head of the present invention is used in the configuration shown in FIG. The horizontal axis indicates the thickness direction of the magnetic pole, that is, the circumferential direction, and the vertical axis indicates the magnetic field strength distribution. 24-piece R/W magnetic bar, yellow, 25
This is due to the E magnetic pole. Therefore, if we consider the peak of 24 as the saturation magnetic field of the recording medium, then the magnetic field due to the E magnetic pole is 25
It's quite low. Therefore, the scenery magnetized by the E magnetic pole R/
It is much smaller than the amount that can be magnetized by W magnetic camellia.

Furthermore, considering that the magnetic field distribution due to the E magnetic pole is sloping and the hysteresis characteristic of the recording medium, the residual magnetization becomes almost zero due to the minor loose locus. Because of this, even if the position of the R/W magnetic pole during recording deviates from the position during reproduction, the magnetic flux caused by the yw magnetic pole that protrudes from the VC recording track during reproduction is almost zero. During regeneration, the KE magnetic flux becomes close to zero due to the amount of change in the magnetic flux and the original loss of the E magnetic pole. From the above, it can be seen that the magnetic head of the present invention has a good S/N ratio and is suitable for increasing track density.

[Brief explanation of drawings]

Figure 1 of the rod is a cross-sectional view of the perpendicular magnetic recording system. Figure 2 is a diagonal diagram of an embodiment of the present invention. Figure 1@3 is a diagram of magnetic field strength distribution according to an embodiment of the present invention.
Auxiliary magnetic pole 2...Exciting coil 3...Ne@medium
4. Main magnetic pole 5. Direction of movement of recording medium 14. R/W magnetic pole 15.
・E magnetic pole 16...E magnetic pole width 17-R/'W magnetic pole width 19-R/W @ g thickness 20...E magnetic pole thickness 24...R/'Magnetic field intensity distribution due to W magnetic pole 25...Magnetic field due to E magnetic pole Intensity distribution map Upper applicant: Suwa Seikosha Co., Ltd. Figure 1

Claims (1)

[Claims] (1) In a magnetic head that records magnetization in a direction substantially perpendicular to the recording medium surface, RFi A D/W RI T
A magnetic head characterized in that magnetic poles thicker than the thickness of one front READ/WRI T Fi magnetic rod are formed on both sides of the B magnetic pole (in a direction perpendicular to the traveling direction of a recording medium).