JPS6236710A - Magnetic head device - Google Patents

Abstract

PURPOSE:To avoid the deterioration in the S/N of a magnetic head device by connecting magnetically an end part of the 1st conductive magnetic flux part which is further from a medium to an end part of a magneto-resistance effect element with the other end part of this element connected to the 2nd conductive magnetic flux part respectively and making a winding circulating partly the 1st conductive magnetic flux part, the magneto-resistance effect element and the 2nd conductive magnetic flux part. CONSTITUTION:A magneto-resistance effect element 17 like an Ni-Fe alloy thin film, etc. is connected magnetically between the 1st and 2nd conductive magnetic flux parts 15 and 16 set at the side opposite to a vertically magnetized layer 11. Here both parts 15 and 16 are made of a magnetic film having high permeability such as a 'Permalloy(R)' or amorphous alloy thin films, etc. The both ends of the element 17 are connected to the external current terminal parts. A protecting layer 20 for element 17 is made of SiO2 etc. and a holding plate 21 for auxiliary magnetic pole made of glass, ceramics, etc. is attached to the layer 20 via an adhesive layer 21A. Then a recording winding 22 is set around the plate 21.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic head device that can be used in high-density data file devices used in perpendicular magnetic recording capable of high-density magnetic recording, AV equipment, and the like.

2. Description of the Related Art Conventionally, as shown in FIG. 3, a so-called auxiliary magnetic pole excitation type has been tested as a magnetic head device for realizing a perpendicular magnetic recording system. A soft magnetic layer (on top of the base film (11)
2) In a perpendicular magnetic recording medium (4) (hereinafter simply referred to as the medium) in which a perpendicular magnetic layer (3) is formed, the main magnetic pole (5) is located on the side of the perpendicular magnetic layer (3), and the medium (4) is An auxiliary magnetic pole (6) is arranged on the opposite side. In the auxiliary magnetic pole excitation type, a coil 1 (7) is wound around the auxiliary magnetic pole (6). During recording, by passing a recording current through the coil (7), the main magnetic pole (5) is excited and recorded, and during reproduction,
A reproduction output is obtained by inducing a voltage across the coil (7) that is proportional to the time differential of the reproduction magnetic flux interlinking with the auxiliary magnetic pole.

Problems to be Solved by the Invention This head, like the conventional head, has 9 windings and a medium (
4) The reproduction output depends on the relative speed between the head and the head. Therefore, a large output cannot be obtained unless the number of windings is increased. In recent years, many attempts have been made to miniaturize devices and realize high-density recording, but in such cases, it is necessary to reduce the relative speed as much as possible to increase the length of time, or to increase the number of windings. Since it operates in a high frequency range, it is not possible to wind a large amount of windings due to inductance and the resulting restrictions on the resonant frequency. On the other hand, from the viewpoint of noise, Barkhausen noise accompanying sudden movement of the domain wall in the soft magnetic layer (2) has become apparent. In the conventional detection method based on the principle of electromagnetic induction, 1.Due to time differentiation, extremely large pulsed noise is mixed into the signal component and S
There was a problem that this resulted in a decrease in /N.

Means for Solving the Problems The present invention provides a main #i positive layer on a perpendicular double layered medium in which a soft magnetic layer and a perpendicular magnetic layer are sequentially laminated on one surface of a base, and a magnetic layer on the opposite side with the perpendicular double layered medium in between. In a magnetic head device, a magnetic head device is provided with an auxiliary magnetic pole having a coil wound around which induces a voltage by reproducing magnetic flux, and a magnetic pole piece made of a high permeability soft magnetic film is arranged on the perpendicular magnetic layer side, and a magnetic pole piece made of a high permeability soft magnetic film is placed on the perpendicular magnetic layer side. On the opposite side, a first magnetic flux part is arranged, the end part of which is sufficiently thicker than the film thickness of the magnetic pole piece, facing the magnetic pole piece, and the end of the first magnetic flux part farther from the medium is arranged. magnetically connected to one end of the magnetoresistive element, and the other end of the magnetoresistive element is connected to a second
The first magnetic flux part, the magnetoresistive element, and the second magnetic flux part are connected magnetically to each other, and a winding is provided so as to surround at least a part of the first magnetic flux part, the magnetoresistive element, and the second magnetic flux part. In at least one of the two magnetic flux conductive parts, the cross section of the magnetic flux conductive part becomes smaller as it approaches the magnetoresistive element.

Function The magnetic head device of the present invention has 1. With the above configuration, the main magnetic pole is excited by the residual magnetization recorded in the perpendicular magnetic layer,
Reproducing magnetic flux flows. This reproducing magnetic flux flows into the first magnetic flux part α, and a part of it flows into the magnetoresistive element αD1 and
The flux flows into the second magnetic flux part tlG in the form of a confluence. Therefore, the specific resistance of the magnetoresistive element aη changes, and by causing a constant current to flow through the magnetoresistive element αD, a reproduced output can be obtained as a voltage across the magnetoresistive element 09. In order to efficiently guide the reproducing magnetic flux to the magnetoresistive element αη, it is effective to change the cross sections of the first and second magnetic flux conducting portions 0!9 and αQ so as to gradually narrow them down. When recording,
By passing a signal current through the coil @, for example, the first conductive flux portion α is excited, and the tip of the main magnetic pole α2 is magnetized by the recording magnetic flux. At the same time, a recording magnetic field can be applied to the perpendicular magnetic layer Q9, and recording is possible. becomes.

Embodiment FIG. 1 shows a sectional view of an embodiment of the magnetic head device of the present invention.

The configuration of the magnetic head installation according to the present invention will be explained.

Perpendicular magnetization 1 of a perpendicular two-layer medium (8) in which a soft magnetic layer Q such as permalloy (perpendicular magnetic layer aυ such as 110oCr) is laminated on a base (9) of organic film or non-magnetic rigid body.
'On the I Qυ side, a magnetic pole piece made of a high permeability magnetic film such as permalloy or amorphous alloy thin film is the main magnetic pole 03.
It is placed as. The main magnetic pole α2 is generally formed on a substrate aJ of glass or ceramic by vacuum evaporation or sputtering, and then etched into a predetermined pattern. Next, a holding plate I made of a material similar to that of the substrate α3
The tip is held in place and the tip is machined into a predetermined shape. on the other hand,
On the side opposite to the perpendicular magnetization layer 0υ, the first magnetic flux part 0!9,
Second magnetic flux conductive part (a magnetoresistive element θη such as a Ni-Fe alloy thin film is arranged between 1G and magnetically connected. Magnetically conductive flux part α9, αl Lt High permeability such as permalloy or amorphous alloy thin film) As shown in the figure, the narrowing down to the magnetoresistive element αD is sufficiently effective even if it is not done from both sides. ) is also effective as shown in Figure 2.As shown in Figures 1 and 2,
A magnetic flux conducting portion α! is formed on the auxiliary magnetic pole substrate α0 made of glass or ceramic through a non-magnetic portion a9 such as 5in2. 9
, Qe are formed by vacuum evaporation or sputtering. Dry etching methods such as ion milling or sputter etching are mainly used for pattern etching.

The inclination of the non-magnetic portion 09 can be controlled during etching.

Both ends of the magnetoresistive element 0η (both ends perpendicular to the paper)
is connected to an external current terminal (not shown). Next, the number of protective layers for protecting the magnetoresistive element aη is 8.
102 or the like. Thereafter, an auxiliary magnetic pole holding plate Cυ made of glass or ceramic is bonded with an adhesive layer 21A. When recording, the winding ■ is wound around it.

Location etc. are determined by optimal design.

Another embodiment of the present invention shown in FIG. 2 will be described.

In this embodiment, the eleventh second magnetic flux part u9, Oe
has a size that contacts the oblique side of the non-magnetic part with a trapezoidal cross section, and the tip part is triangular and has a structure that narrows the magnetic flux to the magnetoresistive element. Nff is arranged so as to straddle and be close to the triangular tip, and to be held by a protective layer (2). - Effects of the Invention Since the magnetic head device of the present invention is of a magnetic flux response type using a magnetoresistive element, it is possible to obtain an output that does not depend on the relative speed between the head and the medium. Large output is achieved even at low speeds. As for Barkhausen noise, since it is not a winding type reproduction, it is not time-differentiated, and it is not a sharp pulse noise, so it is almost negligible. Good short-wavelength reproduction in perpendicular 1% recording maintains the basic feature of the auxiliary magnetic positive type, in which the main pole has an extremely simple structure and only the contact state with the perpendicular magnetization layer needs to be considered. This type of magnetic head device can be said to be extremely suitable for high-density thick reproduction. Furthermore, since this is not a wire-wound type regeneration, there is no need to worry about an increase in inductance due to windings and a corresponding drop in resonance frequency, and high wave operation is possible. Since the magnetoresistive element is placed inside where it does not slide against the medium,
There are no problems such as thermal noise.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of the magnetic head device of the present invention, and FIG. 2 is a cross-sectional view showing an auxiliary magnetic pole part of another embodiment of the present invention.
FIG. 3 shows a sectional view of a conventional example. 8: Vertical double layer medium 9: Base 10: Soft magnetic layer
11: Perpendicular magnetization layer [2: Main magnetic pole 13: Substrate
14: Holding plate 15: First magnetic flux conducting portion 16: Second magnetic flux conducting portion 17: Magnetoresistive element 18: Substrate for auxiliary magnetic pole 19: Non-magnetic portion 20: Protective layer 21: Holding plate for auxiliary magnetic pole 22: Coil patent applicant: Matsushita Electric Industrial Co., Ltd. Company representative: Abe
Gong Figure 1 Figure 2 Figure 3

Claims (2)

[Claims] (1) A main magnetic pole is placed on a perpendicular double-layered medium in which a soft magnetic layer and a perpendicular magnetic layer are sequentially laminated on one side of the base, and a coil that induces a voltage by reproduction magnetic flux is wound on the opposite side of the perpendicular double-layered medium. In a magnetic head device in which a rotated auxiliary magnetic pole is arranged,
A magnetic pole piece made of a high magnetic permeability soft magnetic film is disposed on the perpendicular magnetization layer side, and an end portion that is sufficiently thicker than the film thickness of the magnetic pole piece is opposite to the magnetic pole piece on the opposite side to the perpendicular magnetic layer side. A first magnetic flux part is arranged, an end of the first magnetic flux part farther from the medium is magnetically connected to one end of the magnetoresistive element, and the other end of the magnetoresistive element is connected to the other end of the magnetoresistive element. The end portion is magnetically connected to the second magnetically conductive flux portion, and the first magnetically conductive flux portion;
A magnetic head device comprising a magnetoresistive element and a winding wound around at least a portion of the second magnetic flux conducting section. (2) In at least one of the first and second magnetic flux conducting parts,
2. The magnetic head device according to claim 1, wherein the cross-sectional area of the magnetic flux portion becomes smaller as it approaches the magnetoresistive element.