JPS61105709A - Magnetic write head - Google Patents

Abstract

PURPOSE:To improve the magnetic rite efficiency and reduce the energy and the man-hour by using one means as a heating element which heats a magnetic recording medium as well as a coil which generates a magnetic field for magnetization at the cooling time. CONSTITUTION:When a current is flowed from an electrode layer 7 to a coil and heating resistance element 5 formed on an insulating layer 4 on a high- permeability member substrate 3, this element 5 generates heat, and a magnetic field in the vertical direction is generated in the substrate 3 because the element 5 is a concentric circle-shaped coil, but lines 12 of the magnetic force go in the surface inward direction of the recording medium by a high-permeability member 10 coating the element 5. When the recording medium is moved in the direction of an arrow (a) to pass the member 10, it is cooled quickly by the difference of heat conductivity, and magnetization by a slight magnetic flux is possible. Thus, a small current is flowed to the element 5 to perform heating and magnetization simultaneously, and the magnetic write capability is improved and the energy is reduced. A magnetic head is produced with the same man-hour as a heating head to reduce the man-hour.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a head for magnetically writing on a magnetic recording medium, and particularly to a magnetic write head suitable for fabrication using thin film technology.

[Conventional technology]

Conventionally, there is a magnetic head using thin film technology having a structure as shown in FIG. This thin film head consists of a layer of high magnetic permeability material (1) wrapped around a conductor (2) as shown in the figure, and a layer of high magnetic permeability material (1) wrapped around the conductor (2) through which current
) layer, and then a layer of high magnetic permeability material (1).
) to wrap around the conductor (2) in this way, manufacturing is difficult and expensive, and the conductor (2) cannot be wound many times like a coil. In order to obtain a magnetic field of 500 to 1000[:Oe] necessary for magnetic writing by passing a current I through the conductor (2), a small current is not enough, and an extremely large current ■ is required. It turns out to be something ugly.

[Problem that the invention seeks to solve]

The present invention aims to solve the problem that magnetic writing requires a large current and is not easy to manufacture.

[Means and effects for solving the problems] This invention has the following features:
Therefore, in order to reduce the current required for magnetic writing, it is combined with a heating head that applies heat during magnetic writing, and the heating element and the coil for magnetic field generation have a common structure. The magnetic recording medium can be heated and magnetized at the same time by passing a current through one heating resistive element.

[Example] ゛ □ Hereinafter, seven embodiments of the present invention will be described based on the drawings.

FIG. 1 and FIG. 2 show an embodiment of this invention.
An example of a magnetic recording medium is a case where the present invention is applied to a 41 bullish extraction/isolation array system h7t which performs magnetic t'f writing to an in-plane magnetization medium with a relatively low single Curie point, such as a CrO2 tape.

In FIG. 1, (3) is j, high magnetic permeability member substrate, (4
) is the insulating layer deposited with IVC, (5) is the insulating layer (4)
With the concentric coil-cum-heat-generating resistor element formed above as shown in Figure 2, the coil-cum-heat-generating resistor element (5) is magnetically read in a series of phantom 1, -1 in this example. Magnetism to be performed □Since the recording medium has a relatively low 4-yury point, such as CrO2, the film PW & 2. old)
It is said to be about 0λ. Also, as will be described later, this coil/heating resistor element (5) is a heating element that applies heat to the magnetic recording medium by applying a VC current to the magnetic recording medium (111). At the same time, VC1-8 also serves as a magnetic field generating coil for magnetizing the magnetic recording medium portion that is thus heated and subsequently cooled.

(6) is an adhesive layer made of Cr, (7) is an electrode layer made of Au formed on the soil of -1-distribution adhesive layer (6) as an electrode for passing current to the coil/heating resistance element (5), (8) ) is the coil/heat generating resistor/resistance element (5) excluding the center part (9) of the coil/heat generating resistor element (5) and on this electrode layer (7).
This is an insulating film deposited on the soil, and this insulating layer (8)F is further coated with extremely magnetic permeability so that it is selectively deposited over a predetermined □ area above the coil/heating resistor element (5). +Tj+ high magnetic permeability member (10) is deposited. Regarding the film deposition range of this high magnetic permeability member (10), when performing magnetic writing on a magnetic recording medium, first it is heated and then cooled, and a magnetic field is applied at that time. It is preferable to cover up to, for example, the center part (9) of the coil/heating resistance element (5) so that a magnetic field as shown by the lines of magnetic force (12) exists near the end (11). In the illustrated example, as shown in FIG. 8, about 60% of the upper part of the coil/heating resistor element (5) is covered. In addition, as shown above, the coil and heating resistance element (5
) high magnetic permeability member (1
0), if its magnetic permeability is jJ71 compared to 611+rr+magnetic permeability member substrate (3), it will try to pass through the side with smaller magnetic resistance like the lines of magnetic force (12), so the density will be made thicker to increase the magnetic flux. can be deflected in the in-plane direction of the magnetic recording medium. Therefore, as the high magnetic permeability member (10), it is preferable to use a material whose magnetic permeability is higher than that of the high magnetic permeability part side substrate (3), for example, a material whose magnetic permeability is higher than the order of magnitude is desirable.

11+j Insulating layer f8 not covered with magnetic permeability member (10)
A wear-resistant phase i layer (13) is deposited on the remaining area of 1J:,
When the magnetic write head is used, the magnetic recording medium on the L-position magnetic permeability member (10) side serves as a film retaining layer when the magnetic recording medium moves relatively in the direction of arrow a.

As mentioned above, the magnetic write head array device, which has a structure in which a heat generating head and a magnetic spatula 1 are combined using thin film technology, has a high magnetic permeability material deposited on a substrate and a coil member that serves as both a conductor and a heat generating resistor. It can be obtained by further depositing a film of high magnetic permeability material to selectively cover the upper part.

In the embodiment described above, as an example, Ta2N is used as the H stone of the concentric solid coil/heating resistor element (5), and the substrate (3) of the permeability section is made of 45Ni type bar. The high magnetic permeability member (10) on the other hand is M with a magnetic permeability of about 4.000 μm. A 78N1 permalloy containing 78N1 permalloy of μm4.o, ooo or more was used, and 51o2 was used as the insulating layer (4) and the insulating layer (8), so that the length of the coil/heating resistor element (5) in the electrode direction was 10' (1μ
One with m1 width of 50 μm was manufactured. Manufacture is magnetic ν1
Since the heating element for applying heat at the same time during insertion and the coil for generating the magnetic field have the same configuration, the structure can be realized with the same number of T as the manufacturing process of the heating head.

Next, magnetic writing by the magnetic writing head having the above structure will be explained.

If a current is passed through the coil/heating resistance element (5), the number 1.0
(mA'), and since it is a coil, it generates several tens of oes of heat in the vertical direction against the high magnetic permeability member substrate (3).
A magnetic field is generated, but due to the high magnetic permeability member (10) covering the upper part of the coil/heating resistance element (5), the magnetic field is directed by the magnetic writing head -1- in FIG. It faces in the in-plane direction of the magnetic recording medium traveling in the direction. If a current flows from the electric layer (7) toward the center (9) of the coil/heat generating resistor element (5), the direction of the magnetic flux will be such that it enters the upper surface of the +3-f+ magnetic permeability part. , if the current is passed in the opposite direction, the direction of magnetic flux will be opposite to the above, such that it will come out from the top surface of the high magnetic permeability member (10), but in either case, in the magnetic writing head 10, the direction of the magnetic flux will be in the in-plane direction. I'll be heading there. For this reason, the 1 (marked 1) magnetized medium example heats something like a CrO2 tape as it passes in the direction of arrow a, then cools it down and at the same time causes an explosion during the cooling period. It can be made into (a) by a small magnetic flux.

In other words, when heated, a CrO2 tape that has been magnetized in advance loses its magnetization when it reaches the Curie point or above, but it is difficult to cool it in a state where it has lost this magnetization.
For example, even with a magnetic flux of 3 [Oe], thick magnetization can be obtained by residual magnetization development, and heating and magnetization by such thermomagnetic counting method can be achieved by using the above-mentioned heating element and magnetic field generating coil. This can be done simultaneously by passing a small current of several tens of milliamps (mA) through the coil/heating resistance element (5). Therefore, magnetic writing ability can be improved and energy saving can be achieved.

In addition, regarding cooling of the magnetic recording medium after heating, it is rapidly cooled to provide a period during which the magnetic recording medium can be magnetized by the thermomagnetic writing method as described above before passing through the magnetic writing process. can be secured. As mentioned above, when using the magnetic write head with the above structure, there is a directionality, and the magnetic recording medium is relatively moved in the direction of the arrow a, and the high magnetic permeability member (10) is Used in later-passing relationships. If it is made to pass in the direction opposite to the direction of arrow a, the coil/heating resistance element (5) acts as a heating element as well as a coil for generating a magnetic field, so it will not generate heat. Although the above magnetic force @ (12) is generated, if the heat generation is stopped, this rJ
[At the same time, the generation of magnetic lines of force (12) also stops, so if the magnetic recording medium first passes over the high magnetic permeability member (10) and then passes to the right in Figure 1, In contrast, it is not possible to create a state in which the magnetic field generated by the coil-cum-heating element (5) acts on the cooled magnetic recording medium because the cooling time to cool it quickly cannot be increased. , as described above, if the direction of relative movement is in the direction of the arrow a and the high magnetic permeability member (10) is passed later, the high magnetic permeability member (10) to be passed later and the high magnetic permeability member ( 10) and the wear-resistant layer (I3).
) Due to the difference in thermal conductivity between the coil and heat generating resistor element (10), the coil and heat generating resistor element ( 5) Rapid cooling is performed during the period when a magnetic field is being formed, making it possible to achieve magnetization by a slight magnetic flux as described above.

In this way, according to the magnetic write head of the above embodiment, magnetic writing is possible with a small current of several tens of milliamps (mA: II) due to the heating effect of the heating element that also serves as a coil for generating a magnetic field, and as shown in FIG. Unlike the thin-film head described above, it does not require a large current, so it can improve the efficiency of magnetic writing and save energy.Moreover, since the heating element and the magnetic field generation coil are common and have the same configuration, it can be manufactured by thermal head production. High-resolution dust arrays can be easily fabricated using the same manufacturing method.

The above-mentioned magnetic writing heads are arranged in multiple rows on a magnetic recording medium in the form of an endless belt, for example, and conduct magnetic writing by passing a current in accordance with an image signal, and then magnetically develop the magnetic writing head to write it onto a sheet of paper. "Transfer": Can be used for applications such as printers.

In the above embodiment, since the magnetic recording medium is a magnetic recording medium such as CrO2 with a relatively low Curie point, the film thickness of the coil/heating resistance element (5) is set to about 2,000 mm.
However, if the target is a magnetic recording medium that requires a magnetic field and high temperature, the thickness should be made thicker to manufacture a device that is suitable for such cases. I can do it. Further, although Ta2N is used as the material for the coil/heating resistance element (5), other materials such as N1/Cr alloy may be used instead.

Furthermore, the high magnetic permeability member substrate (3) and the upper high magnetic permeability member (10) in the magnetic write head of the above embodiment may be made of ferrite instead of permalloy, and the insulating layer (
4) The insulating layer (8) may be made of an organic material such as polyimide instead of SiO2.

〔Effect of the invention〕

As described above, the present invention can improve the efficiency of magnetic writing by combining a heating head that applies heat during magnetic writing with a magnetic head, thereby saving labor and cost. Since they have a common structure, it is possible to use the same manufacturing method as for producing the heat-generating head, and the magnetic write head can be manufactured with the same number of steps as the heat-generating head manufacturing process.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a magnetic write head according to an embodiment of the present invention, FIG. 2 is a top view of the same, and FIG. 8 is a structural diagram of a magnetic head using conventional thin film technology. [Explanation of symbols] (3)... High magnetic permeability member substrate (5)... Coil and heat generating resistor element (9)...
... Coil center (10) ... High magnetic permeability member (11) ... End of head (12) ... Lines of magnetic force (13) ... Resistance wear layer

Claims (1)

[Claims] A magnetic write head characterized in that a heating element for heating a magnetic recording medium during magnetic writing and a magnetic field generating coil for generating a magnetic field for magnetization when cooling the medium are used in common.