JPS6059517A - Recording and reproducing composite head for vertical magnetic recording - Google Patents

Abstract

PURPOSE:To simplify a constitution and a reproducing process by constituting a magnetic pole of a recording single magnetic pole winding type head part by a multi-layer consisting of a ferromagnetic layer and an insulating layer and making any one ferromagnetic layer functionate as a reproducing magneto-resistance effect type head part. CONSTITUTION:A spiral coil conductor layer 23 is formed on a magnetic substrate 21 to be used also as a slider through an insulating layer 22 and a magnetic pole 25 having multi-layer structure consisting of a ferromagnetic layer 26 with 400-1,000Angstrom thickness and an insulating layer 27 with 100-500Angstrom thickness is arranged on the upper surface of the layer 24. The 1st ferromagnetic layer 26a is made to functionate as a magneto-resistance effect type head. Said constituion makes it possible to simplify the structure. Since the magnetic pole of the single magnetic pole type head is formed as the multi-layer structure, the vertical recording efficiency is improved and a reproducing magneto-resistance effect type head can be operated in a linear area, so that recording and reproducing with high density can be easily performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (al) Technical Field of the Invention The present invention relates to a recording/reproducing compound head for perpendicular magnetic recording, which is particularly easy to manufacture, and is suitable for recording/reproducing in magnetic disk devices and magnetic tape devices using the perpendicular magnetic recording method. The present invention relates to a thin film type composite head suitable for the head.

(1) Background of the technology Conventionally, main pole excitation type magnetism without an auxiliary pole has been used as a thin film magnetic head that records and reproduces information at high density on magnetic recording media such as magnetic disk devices or magnetic tape devices.
A composite head that integrates a magnetic flux-responsive magnetoresistive head (MR head) that can obtain a high reproduction output regardless of the relative speed between the head and the medium. , various types have been proposed.

tc+ Prior Art and Problems The conventional composite head for perpendicular magnetic recording and reproducing mentioned above is not shown in the plan view of the main part in FIG. 1 and in FIG.
As shown in the cross-sectional view of the main part along the -n' cutting line, a magnetoresistive element (hereinafter M
l? A first shield layer 3 made of barmai (Ni-Fe alloy) for the device (referred to as element) is disposed, and on top of it
1 First insulating layer 4 made of SiO etc., M made of non-magnetic and highly conductive copper (Cu), aluminum (AI) etc.
Bias conductor 5 for R element, second insulation N6, permalloy
(Ni-Fe alloy) element N7, third insulating layer 8
and a second shield layer 9 (which also serves as a magnetic pole for a recording head) made of Ni-Fe alloy for MR elements are laminated to form a reproducing magnetoresistive type navel F section 2. Also, on the second shield layer for the old element of the magnetoresistive head section 2 for reproduction, that is, on the magnetic pole 9 for the recording head,
Furthermore, non-magnetic and highly conductive copper (
A coil conductor [12] made of Cu), aluminum (AI), etc., a fifth insulating layer 13, an upper magnetic N14 made of permalloy (Ni-Fe alloy), and a sixth insulating layer 15 are laminated in this order to form a single magnetic pole winding type for recording. The head portion 10 is constructed and integrated into a composite type.

In order to record information on the magnetic recording medium 17 with the composite head, the magnetic pole 9 for the recording head and the MR element layer 7 are required.
The head tip 16 with the exposed tip is attached to the magnetic recording medium 17.
When a predetermined current is passed through the coil conductor layer 12, the magnetic field generated by the coil conductor layer 12 causes a recording heel l°.
The magnetic pole 9 is magnetized and recording is performed.

Also, during reproduction, a bias magnetic field is applied to the IR element layer 7 by passing a constant current through the MR element layer 7 and a predetermined current through the bias conductor 5, thereby changing the magnetic field on the surface of the magnetic recording medium 17. Depending on the strength of Ml? Reproduction is performed by changing the resistance of the element layer 7.

However, in the above-mentioned conventional recording/reproducing composite head for perpendicular magnetic recording, a plurality of types of thin films are laminated together in multiple layers on a single substrate 1''2, and a magnetoresistive head section 2 for reproduction and a recording head section 2 for recording are used. Since the single magnetic pole winding type head section 10 is constructed in a laminated manner, the structure is complicated, and the manufacturing process of the composite head is not only complicated, but also has the disadvantage that an increase in manufacturing man-hours is unavoidable. .

(d) Object of the Invention In view of the drawbacks of the conventional art, the present invention provides a novel recording/reproducing composite for perpendicular magnetic recording, which has a simple structure, simplifies the manufacturing process, and has excellent magnetic recording/reproducing characteristics. The purpose is to provide a head.

According to the present invention, the present invention provides a composite head in which a reproducing magnetoresistive head section and a recording single-pole winding head section are integrally formed by a thin film on a substrate. Single magnetic pole 1 @ linear head magnetic pole for 400 to 1
A multilayer structure in which ferromagnetic layers with a thickness of 1,000 μm and insulating layers with a thickness of 100 to 500 μm are alternately laminated in multiple layers, and a plurality of ferromagnetic layers constitute a magnetic pole of the multilayer structure. This is achieved by providing a recording/reproducing composite head for perpendicular magnetic recording, characterized in that any one of the ferromagnetic layers is configured to function as a magnetoresistive head section for reproduction.

(f) Embodiments of the invention Embodiments of the invention will be described in detail below with reference to the drawings. - FIG. 3 is a partially cutaway perspective view of the main parts conceptually showing an embodiment of the recording/reproducing composite head for perpendicular magnetic recording according to the present invention, and FIG. 4 is not shown in FIG. FIG. 3 is a cross-sectional view of main parts taken along a cutting line. In both of these figures, 21 is a magnetic substrate made of Ferrite I- or the like which also serves as a slider, and the magnetic substrate 21- is made of Sin.

A first spiral coil conductor layer 23 made of non-magnetic and highly conductive copper (Cu), aluminum (A1), etc. is provided via a first insulating layer 22 made of 5i02.

Further, a second insulating layer 24 is formed on the first insulating layer 22-H so as to cover the first spiral coil conductor layer 23,
On its upper surface, a thickness of 400 to 1000, e.g. 70
A ferromagnetic layer 26 made of permalloy (Ni-Fe alloy) or the like with a thickness of 0.0 mm and an insulating layer 2 made of SiO, 5i02, etc. with a thickness of 100 to 400, for example 300.
The magnetic pole 25 has a multilayer structure, in which the magnetic poles 7 and 7 are alternately stacked in multiple layers, and has a four-layer structure in this embodiment.

A plurality of ferromagnetic layers 26 forming the magnetic pole 25
For example, the first ferromagnetic layer 26a therein is electrically connected to a conductive terminal layer 28 made of copper (Cu), aluminum (AI), etc., which is also provided when forming the magnetic pole 25. , to function as a magnetoresistive head (hereinafter referred to as an MR head). Furthermore, a second magnetic pole including the magnetic pole 25
A second spiral coil conductor layer 30 and a fourth insulating layer 31 are laminated in this order on the insulating layer 24 with a third insulating layer 29 interposed therebetween, and the tips of the two magnetic poles 25 are connected to the composite head. The surface facing the magnetic recording medium 32 is exposed.

The structure of the thin film composite head constructed as described above is much simpler than that of conventional type composite heads, and
, the magnetic pole 25 is magnetized by passing a current in the opposite direction through the second spiral coil conductor layer 23, 30, and the magnetic flux generated at the tip of the magnetic pole 25 transfers information in a direction perpendicular to the surface of the magnetic recording medium 32. will be recorded. To reproduce the information recorded on the medium 32, a predetermined current is passed through the MR head made of the first ferromagnetic material ti26a through the conductor terminal layer 28, and then the first and second spiral coil conductors are layer 23
．． By applying a bias magnetic field by passing a current through the MR element 30, reproduction can be performed by changing the resistance of the MR element 26a depending on the strength of the magnetic field on the opposing surface of the magnetic recording medium 32.

Ig)) Effects of the Invention As is clear from the explanation in Section 1-1-, according to the perpendicular magnetic recording recording/reproducing composite head of the present invention, the magnetic pole of the single magnetic pole type head for recording has a multilayer structure, and Since one layer of the magnetic pole of the multilayer structure is compositely constructed as a magnetoresistive head section for reproduction, the structure is simple and manufacturing is easy. In addition, by making the magnetic pole of the recording single-pole head multi-layered, the perpendicular recording efficiency is increased, and the reproduction magnetoresistive head composed of the '4 film can be operated in the linear region. It has two excellent practical advantages, such as easy high-density recording and playback. Therefore, it is extremely advantageous to apply it to magnetic recording/reproducing heads of magnetic disk devices, magnetic tape devices, etc. that employ the perpendicular magnetic recording/reproducing method.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the main parts of a conventional composite head for perpendicular magnetic recording and reproducing, and FIG.
FIG. 3 is a cross-sectional view of the main part taken along the cutting line, FIG. I shown in Figure 3
FIG. 2 is a cross-sectional view of the main part taken along the cutting line V-IV'. In the drawing, 21 is a magnetic substrate, 22 is a first insulating layer,
23 is the first spiral coil conductor layer, 24 is the second insulating layer, 25 is the magnetic pole, 26 is the ferromagnetic layer, 26a is the first ferromagnetic layer (Ml? head), 27 is the insulating layer, 28 is the conductor terminal layer,
29 is a third insulating layer, 30 is a second spiral coil conductor layer, 31 is a fourth insulating layer, and 32 is a magnetic recording medium. Figure 1 π Figure 2

Claims (1)

[Scope of Claims] (11) A composite head in which a reproducing magnetoresistive head section and a recording single magnetic pole I@linear navel F section are integrated by a thin film on a substrate, The magnetic pole of the remote pole winding type head part has a multilayer structure in which ferromagnetic layers and absolute i+i layers are laminated alternately in multiple layers, and among the plurality of ferromagnetic layers that constitute the magnetic pole of the multilayer structure, A recording/reproducing composite head for perpendicular magnetic recording, characterized in that one of the ferromagnetic layers is configured to function as a magnetoresistive head section for reproduction. (2) Each ferromagnetic material forming the magnetic pole. The layer thickness is 40
0 to 1000 people, insulation layer thickness 100 to 500 people
The recording/reproducing composite head for perpendicular magnetic recording according to claim (1), which is a human head.