JPS59231716A - Vertical recording head - Google Patents

Abstract

PURPOSE:To record signals with high S/N by covering both sides of a main magnetic pole layer of a thin film vertical recording head with a ferromagnetic material and therefore facilitating easy recording with multiple tracks as well as reducing the effect of external noises. CONSTITUTION:A corner part is cut to a substrate 2 of a ferromagnetic material for crossing between a face opposite to a medium 8 and a face where a main magnetic pole layer 11 is formed. Then a nonmagnetic insulated material 4 is filled into said corner part, and a spiral coil layer 3 is formed on the material 4 via an insulated material 12. Furthermore the layer 11 consisting of a ferromagnetic thin film is formed on the layer 3 via an insulated material 13. Then a ferrite plate 2' filled with a nonmagnetic insulated material 4' is adhered with glass 15 to the notch formed at the entire area of the corner part where a face opposite to the substrate 2 and a face opposite to the medium 8 cross each other via an insulated layer 14. Thus the effect of external noises can be reduced and the S/N is improved for recording.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a perpendicular recording head that is less susceptible to externally induced noise and is suitable for multi-track recording.

Conventional configuration and its problems As a perpendicular recording head capable of recording from one side of a recording medium, conventionally, as shown in FIG. A structure has been proposed in which a spiral coil layer 32 and a main pole layer 1 made of a ferromagnetic thin film are formed thereon. Reference numeral 8 denotes a recording medium, which is composed of a perpendicular anisotropic medium 5°, a high magnetic permeability medium 6, and a base film 7.

The operation of this perpendicular recording head is as follows: When a signal current is passed through the spiral coil layer 3, the signal magnetic flux is transferred from the main pole layer 1 to the perpendicular anisotropic medium 5 → high permeability medium 6 → perpendicular anisotropic medium 5 → ferromagnetic The perpendicular anisotropic medium 5 under the main pole layer 1 is strongly magnetized.

However, when used with equipment that has a lot of external noise,
In the perpendicular recording head having the above structure, the main pole layer 1 is magnetized by an external unnecessary magnetic field, and the recorded magnetization on the recording medium 8 becomes noisy.

On the other hand, a perpendicular recording head having a configuration in which a main magnetic pole 1' is sandwiched between auxiliary magnetic poles 9, 9' made of ferromagnetic material as shown in FIG. 2 has been proposed from the viewpoint of recording efficiency. Although this perpendicular recording head is less susceptible to external noise than the example shown in FIG. 1, such a structure makes it difficult to use multiple tracks and is not suitable for a multi-track head intended for high-density recording.

SUMMARY OF THE INVENTION An object of the present invention is to provide a perpendicular recording head that facilitates multi-track recording and can reduce the influence of external noise.

Structure of the Invention The perpendicular recording head of the present invention has an end face as a medium facing surface and one main surface as an f layer forming surface, and at least the entire corner where the medium facing surface and the layer forming surface intersect is cut out and that portion is cut out. a ferromagnetic substrate filled with a first non-magnetic insulating material, an end surface serving as a medium facing surface, and one principal surface serving as a substrate facing surface facing the layer forming surface, at least the medium facing surface and the substrate facing surface; A ferromagnetic plate whose entire corner where the planes intersect is cut out and filled with a second non-magnetic insulating material, and the first and second non-magnetic materials whose centers are on the layer formation surface of the ferromagnetic substrate are bonded. a spiral coil layer formed so as to be located near the surface and on the ferromagnetic material side; and a spiral coil layer formed thinner than the ferromagnetic substrate and having a base end located at the center of the spiral coil layer and the ferromagnetic substrate. The main magnetic pole layer is magnetically coupled and has a tip extending across the upper side of the spiral coil layer to the medium facing surface of the ferromagnetic substrate.

With this configuration, in a thin-film perpendicular recording head that can easily have a multi-track configuration, both sides of the main pole layer are covered with a ferromagnetic material, making it less susceptible to external noise.
Signal recording with good S/H becomes possible.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be explained with reference to FIG. In FIG. 3, a substrate 2 made of a ferromagnetic material such as Mn-ZnJpNi-Zn-y Sio2 and AI in this part! 203 is filled with non-magnetic insulating material 4. On top of this, All IAn is formed using a normal thin film process via an insulating material 12 such as 5io2.
? A spiral coil layer 3 made of , CI, etc. is formed. A main pole layer 11 made of a ferromagnetic thin film is formed roughly thereon with an insulating material 13 interposed therebetween.

The main pole layer 11 is composed of, for example, an amorphous ferromagnetic film 1' with a thickness of 0.5 μm and a permalloy film 10 with a thickness of 2 pm overlying the amorphous ferromagnetic film 1'. Further, a glass 15 ferrite plate 2' is filled with a non-magnetic bonding material 4' in a notch provided in the entire corner where the substrate facing surface and the medium facing surface intersect with each other via the insulating film 14. It is glued with.

The operation of this perpendicular recording head is similar to that of FIG. 1, in which the Mn -7,n ferrite plate 2' has a magnetic shielding function, and arrow A in the figure indicates the path of magnetic flux.

According to the configuration of this perpendicular recording head, since both sides of the main pole layer 11 are covered with ferromagnetic material, recording with a good S/N can be performed with less influence from external noise. In addition, since the main pole layer 11 has a two-layer structure, efficient recording can be performed without saturation even in the inner circumference of the spiral coil layer 3 where the magnetomotive force is large.

Generally speaking, from a manufacturing perspective, when creating a head with a structure in which ferromagnetic material is arranged on both sides, a complicated ferromagnetic material structure as shown in Figure 2 was required in the past, but in the case of the perpendicular recording head of this invention. As shown in FIG. 3, it is very easy to manufacture because it is only necessary to attach a plate made of ferrite or the like whose notches are filled with a nonmagnetic material in advance after the thin film manufacturing process of the perpendicular recording head is completed. Furthermore, since this perpendicular recording head can be manufactured using a thin film process, it is possible to have a narrow track/multiple structure compared to conventional heads.

Effects of the Invention According to the present invention, it is possible to obtain a perpendicular recording head with an easy multi-track configuration and a good ratio of 8/N, which is not affected by external noise.

[Brief explanation of the drawing]

FIG. 1 1d is a cross-sectional view of a conventional perpendicular recording head, FIG. 2 is a schematic diagram of another conventional perpendicular recording head, and FIG. 3 is a cross-sectional view of an embodiment of the present invention. 2... Substrate, 3... Spiral coil layer, 4, 4'...
・Nonmagnetic insulating material, 11...Main magnetic pole layer, 2'...Mn
-Zn ferrite plate

Claims (2)

[Claims] (1) With the end face serving as the medium facing surface and one main surface serving as the layer forming surface, at least a corner where the medium facing surface and the layer forming surface intersect is cut out, and that portion is filled with a first nonmagnetic insulating material. a ferromagnetic substrate having an end face as a medium facing surface and one main surface as a substrate facing surface opposite to the layer forming surface, with at least a corner where the medium facing surface and the substrate facing surface intersect being cut out. 2, a ferromagnetic plate filled with a non-magnetic insulating material, and a layer forming surface of the ferromagnetic substrate, the center of which is located near the joining surface of the first and second non-magnetic materials and on the ferromagnetic side. a spiral coil layer formed as shown in FIG. A perpendicular recording head comprising a main pole layer extending across the upper side and reaching a medium facing surface of the ferromagnetic substrate. (2) The perpendicular magnetic head according to claim (1), wherein the main pole layer has a tip facing the recording medium that is thinner than other parts.