JPS58169317A - Magnetic head - Google Patents

Abstract

PURPOSE:To reduce write power applied to a thin film magnetic head, and a calorific value, and to obtain a high reliability head, by containing an information recording thin film magnetic head in a gap of a bias magnetic head for generating a bias magnetic flux being below anti-magnetic force of a magnetic recording medium. CONSTITUTION:A thin film magnetic head 5 is fixed to a gap part 3 between magnetic poles 2 of a U-shaped bias magnetic head 1 by a non-magnetic material 6. As for the magnetic head 5, a magnetic material 8 and a spiral coil 9 are formed through an insulating layer 10 on the surface of a nonmagnetic substance substrate 7. As for this thin film magnetic head 5 and the bias magnetic head 1, the respective tip faces and magnetizing directions are made to coincide with each other and to bring into contact with a magnetic recording medium. A direct current is supplied to a coil 4 so that a magnetic flux being below anti-magnetic force of a magnetic tape operates on the bias magnetic head 1, and in this state, a pulse current of the same magnetizing direction as the direction of the generated magnetic field of the head 1 is supplied to a coil of the head 5, and write is executed to the magnetic tape. In this way, a current supplied to the head 5 can be reduced, therefore, the number of coil windings of the head 5 is decreased, the structure is simplified, power consumption is reduced, and the calorific value is made small.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head, and more particularly to a thin film magnetic head capable of reducing write current.

In recent years, as the amount of information has increased, there has been a strong desire for high-density recording on magnetic recording media. For high-density magnetic recording, miniaturization of write heads is of paramount importance, and thin-film magnetic heads using thin-film technology have become mainstream.

In this case, the thin-film magnetic spatula r is made by forming a magnetic pole with an open tip and a U-shaped cross section by evaporating, sputtering, or using a combination of iron and nickel on the surface of an insulating substrate such as ivy. A conductive A-turn in the form of a conductor is formed around this magnetic pole to form a fill.

Since this thin film magnetic head IP mortar with a J: shape is manufactured using thin film technology, it has the characteristic that extremely small objects can be obtained with high precision.

On the other hand, in order to achieve high-density recording, it is important to reduce the size of the magnetic head and to improve the characteristics of the lifting medium. In particular, in order to perform high-density recording, it is desirable that the coercive force of the medium be as large as possible, and in recent years the coercive force of recording media has been increasing more and more.

The magnetic head has more than a drag force! 1- Information cannot be recorded without generating an ugly flux, and the write magnetic field from the magnetic head is required to become increasingly hot. As mentioned above, since the coil is made up of a thin film conductive layer, it is extremely difficult to increase the number of turns in the coil due to its structure and manufacturing process. This is dealt with by increasing the current.

However, if the write current is increased in a thin-film magnetic head, since the fill is made of a thin-film conductive layer, the amount of heat generated will increase and the reliability will be low. The increase in write current has the problem of increasing the cost of peripheral circuits.

Therefore, an object of the present invention is to provide a magnetic head that can reliably write information with a small write current.

The air head is a thin film magnetic head for writing with a gap IK of the air head that generates a /9 air flux.
Accommodated, Aias Ugami was added and the ninth condition was lowered Ktk%/h
The purpose of the present invention is to reduce the current value applied to the thin-film magnetic head in order to create a structure that allows information writing to be performed. Hereinafter, a magnetic head based on zero firing @ will be explained in detail with reference to the drawings.

The figure is a plan view showing an embodiment of the magnetic head according to the present invention, and the figure shows a noseious magnetic head for generating an ias magnetic field of 1%/a and 1#id. And this Seianuhets PI is almost U-shaped and grows nine poles,
A gap portion 3 having a relatively wide width is provided between both ends.
is provided. 4 is a coil wound around the magnetic pole 2;

By applying a direct current R11 to this coil 4, the magnetic pole 2 is converted into a direct current as shown in the diagram. A thin-film magnetic head is installed at the ninth position for performing high-quality writing, and is housed in a /9 magnetic head P'' In this case, the thin film magnetic head 5 is formed by contacting a thin film onto a substrate 70 made of a non-magnetic material such as selank. It is formed through 9. And this thin l
[The magnetic head 5 and the magnetic head 1] have their tip surfaces and magnetization directions aligned with each other.

In the magnetic head constructed in this manner, a magnetic tape serving as a magnetic recording medium is moved at a constant speed in contact with the recording surface of the leading end surface of the magnetic head. In this case, the magnetic tape is processed by a direct current demagnetizing head (not shown) provided with the InK of this magnetic head, with a thin dust magnetic head 5 in the information writing direction.
All information □ is forcibly erased by being uniformly magnetized in the opposite direction to the magnetization direction caused by .

On the other hand, the magnetic head 1 is magnetized to the polarity shown by the direct current supplied to the fill 4, and leakage magnetic flux is generated from the gap 6, causing the front surface KI of the magnetic head to be magnetized to the polarity shown.
I! ! It acts on a moving magnetic tape. In this case, the direction of magnetization of the magnetic tape by the Noise magnetic head IK is:

The direction of magnetization is opposite to the direction of magnetization caused by the above-mentioned direct current erasure. The direct current value supplied to the coil 4 is set so that the line of force acting on the magnetic tape by the A ear air head 1 and the magnetic flux that is less than the drag force of the magnetic tape are applied. In this state 11, when recording the Norms modulation information, the thin film magnetic head 6 is set so as to generate a magnetic flux having the same magnetization direction as the direction of the magnetic field generated by the magnetic head Fl. ; Supply pulse current to the coil 9. In this case, the magnetic field generated by the thin film magnetic spatula r50 is set such that the added value with the magnetic flux generated by the A ear magnetic head l becomes a value that sufficiently exceeds the coercive force He of the magnetic tape. Therefore, a magnetic force greater than the repelling force acts on the magnetic tape only when the thin film magnetic head 5 for writing generates a bundle. The magnetization direction of the opposing portions is reversed, and information is arranged. Kumasi, Usui SCS
The magnetic head 5 acts in the magnetic field generated by the /9 magnetic head L, and as a result, the thin film magnetic head S acts on the difference between the coercive force of the magnetic tape and the magnetic flux I coercive. All that is required is to generate a small amount of writing magnetic flux that is mutually exclusive. Therefore, the value of the current supplied to the coil 9 of the thin-film magnetic head device is reduced by the value necessary to generate the ΔIan magnetic flux acting on the magnetic thesis by the magnetic head 1/1. Therefore, the write current supplied to the coil 9 of the thin film magnetic spatula P5 is extremely small if the number of turns of the fill 9 is the same. Therefore, almost no heat is generated from the coil 9 made of a thin film, and as a result, a highly reliable magnetic head can be obtained. 1*, if the write current value decreases, a smaller peripheral circuit will suffice, so 1=K significantly affects the stop-down.

In the above embodiment, the bias magnetic spatula P has a structure in which a coil is wound around the magnetic pole to flow a DC current, but the present invention is not limited to this. It is sufficient to apply a direct current magnetic flux that is less than the coercive force of the magnetic recording medium to the recording portion of the magnetic recording medium by the magnetic head. It is also possible to use a part of the magnetic pole, or a negative pole itself that is magnetized.

As explained above, the magnetic radiation head according to the present invention is operated in a direction along the surface of a magnetic recording medium and with a coercive force of /? A thin film magnetic head for information recording is housed in the gap of the A ear magnetic head that generates ear magnetic flux, and the tip position of this thin film magnetic head and the direction of the generated magnetic flux are made to match that of the /9 ear magnetic head. .

As a result, the write current applied to the thin-film-air head is significantly lower than that in the past), and the amount of heat generated is also reduced, resulting in a significant improvement in reliability. In addition, in the above configuration, the magnetic field generated by the thin film magnetic head for information writing and color printing can be reduced by the amount of the /9 Ias magnetic flux generated by the /9 Ias magnetic head, and therefore the thin film conductive layer is used. The number of windings in the coil is reduced, simplifying the structure and manufacturing process.

Further, the reduction in the write current has various excellent effects such as being able to lower the Ix of the peripheral circuitry that drives the thin AAA head.

[Brief explanation of the drawing]

The figure is a plan view showing an embodiment of the magnetic head according to the present invention. 1-...A ear magnetic head, 2...-pole, 3...
Gap portion, 4...; Ill, S... Thin film magnetic head, 6... Non-magnetic material, 7--Substrate, 8-- Magnetic pole, 9
...Coil, 10...Insulating material.

Claims (1)

[Claims] (1) It has a U-shape and has a 4' cross section formed between the tips of nine magnetic poles, and is housed in the gap between the nine-earth magnetic head and this bias magnetic head. A magnetic head consisting of a thin film magnetic head whose generated magnetic flux direction and tip position are aligned with the above-mentioned No. 9 ear magnetic head, wherein the No. 9 ear magnetic head is moved at a constant speed with its tip ear portion KIL. K is preformed to generate a magnetic flux less than the coercive force of the medium;
In addition, the thin film magnetic spatula l' can receive a round write current that generates a magnetic flux whose added value with the magnetic flux sufficiently exceeds the coercive force in the fill provided therein. A magnetic head characterized by not being formed like this.