JPH03230307A - Magnetic head - Google Patents

Abstract

PURPOSE:To simplify the construction of a magnetic head and to facilitate the production thereof by holding a part of a magnetic head body with a structure which holds piezoelectric materials with electrodes and forming the body part held with this structure CoF2. CONSTITUTION:A part of the body 1 is held and formed of the structure which helds the piezoelectric materials 8 with the electrodes 2. The held part A of the body 1 is formed of CoF2 or MnF2. An electric field is generated in the materials 8 and the materials oscillate when the AC voltage corresponding to an input signal is impressed to the electrodes 2 from lead wires 3. Magnetization is induced in the part A by this oscillation and a leak magnetic field is generated in the gap part B of the body 1. The recording and reproducing to the recording medium are executed by this leak magnetic field. The need for winding a coil on the magnetic head is eliminated in this way and the construction is simplified, by which the production is facilitated.

Description

[Detailed Description of the Invention] 5 Industrial Application Fields The present invention is applicable to 5 industrial applications of magnetic recording media such as VTRs, videos, floppy disks, and hard disks (IT).
The present invention relates to a magnetic head that can be used in 15.

[Prior Art] Generally, as shown in FIG. 2, a magnetic head is made of a soft magnetic material such as ferrite and has a structure in which a coil 4 is wound around a head body 5 having a gap portion B. By passing a current through the head body 5, magnetization is induced in the head body 5, and the induced magnetization generates a leakage magnetic field in the gap B. Recording on the magnetic recording medium is performed by using this leakage magnetic field. . Further, reproduction is performed by taking in a magnetic signal recorded on the medium from the gap B, inducing a reproducing voltage in the coil 4 by taking in this signal, and detecting the reproducing voltage. However, as the recording density of media has improved in recent years, there has been a demand for smaller magnetic heads, and magnetic heads with a coil-wound structure as shown in Figure 2 are difficult to process. It is difficult to respond to the miniaturization of

[Problems to be Solved by the Invention] An object of the present invention is to provide a magnetic head that is easy to manufacture and can improve productivity.

[Means for Solving the Problems] As a result of intensive studies to solve the above problems, the present inventors found that a magnetic head having a simple structure can be obtained by utilizing the piezo magnetic effect. It came out,
The present invention has now been completed.

That is, in the present invention, a part of the main body is sandwiched between structures in which a piezoelectric material is sandwiched between electrodes, and at least the part of the main body sandwiched between the structures is made of Co F 2 or M n F 2 .
This is a magnetic head characterized in that it is configured by:

[Operations] Figure 1 shows the magnetism of the present invention. In FIG. 1, 1 indicates the quality of the magnetic spatula 3 through which input/output signals are transmitted. An example of the structure of a magnetic helad according to the present invention is shown in which the main body 2 is an electrode; Part A of the main body sandwiched between the above structures is CoF
Or composed of M n F 2.

Here, the piezoelectric material 8 in the magnetic head of the present invention is used to apply a strain to the portion A of the main body by the voltage applied from the electrode 2, or to sense the strain generated in the portion A of the main body and use this as a voltage to be applied to the electrode. arranged to communicate to 2;
For example, potassium phosphate or Rochelle's salt (sodium potassium tartrate) can be used. In addition, electrode 2
Although any material can be used as long as it exhibits electrical conductivity, for example, aluminum is preferably used. Further, it is sufficient that at least the portion A of the main body is made of CoF or M n F 2 , and the constituent materials of the main body other than the portion A are not particularly limited as long as they exhibit magnetism. Portions other than the main body A can be constructed using, for example, the same material used to construct the main body A, ferrite, or the like.

By the way, in the magnetic head of the present invention, C o F 2 or M n F 2 constituting the part A of the main body is a substance that exhibits a piezo magnetic effect (hereinafter referred to as PM effect), and this effect makes it possible to achieve the magnetic head of the present invention. The magnetic head works. Therefore, unlike the conventional magnetic head, the magnetic head of the present invention does not need to be wound with a coil and has a simple structure, so that it can be manufactured easily. Note that the PM effect is a phenomenon in which when stress is applied, magnetization is induced in proportion to the stress, or stress is induced in proportion to magnetization.

Hereinafter, recording on a medium and reading recording from the medium using the magnetic head of the present invention will be explained.

Recording on the medium is performed by applying an alternating current voltage corresponding to the input signal transmitted from the lead wire 3 to a portion A of the main body 1 through the electrode 2.

By applying this voltage, an electric field is generated in the piezoelectric material 8,
The voltage substance 8 vibrates. This vibration generates stress in the portion A of the main body 1. Here, part A of main body 1 is P
In order to exhibit the M effect, magnetization is induced in the portion , and this magnetization induces magnetization 6 in the main body 1 as shown in FIG.

Furthermore, the induced magnetization 6 gives a leakage magnetic field 7 to the gap portion B of the main body 1 as shown in FIG. 3, so that recording on the medium becomes possible by utilizing this leakage magnetic field 7. .

On the other hand, playback is performed as follows. First, the leakage magnetic flux of the medium is taken in from the gap portion B of the main body 1. As a result, magnetization is generated within the main body 1, and the magnetization is induced to the portion A of the main body 1. This induced magnetization causes distortion in the part A of the main body 1 due to the PM effect, and this distortion is transmitted to the piezoelectric material 8, causing alternating current electric polarization P to occur in the piezoelectric material 8. Here, when the surface charge density of the electrodes 2 is σ, the electric polarization P is expressed as P−σ. Furthermore, if the area of the electrode 2 is 81, and the total amount of charge induced in the electrode is Q, and the capacitance is C, then the potential difference V generated between the electrodes 2 is: A potential difference of V-3P/C occurs between them. Therefore, the electrical polarization P generated in the piezoelectric material 8 described above is converted into a potential difference V between the electrodes 2 and the lead wire 3.
This detection allows the output signal to be read from the medium.

[Effects of the Invention] As described above, the magnetic head of the present invention has a simple structure and is easy to manufacture, so that it can respond to the miniaturization of magnetic heads in recent years.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of the structure of the magnetic head of the present invention. FIG. 2 is a diagram showing the structure of a conventional magnetic head. FIG. 3 is a diagram showing the direction of magnetization induced in an example of the magnetic head of the present invention. In the figure, 1.5...Main body 2...Electrode 3...Lead wire 4...Coil 6...Magnetization 7...Leakage magnetic field 8...Piezoelectric material A...Main body A portion B sandwiched between structures in which a piezoelectric material is sandwiched between electrodes indicates a gap portion of the main body.

Claims (2)

[Claims] (1) A magnetic head characterized in that a part of the main body is sandwiched between structures in which a piezoelectric material is sandwiched between electrodes, and at least the part of the main body sandwiched between the structures is made of CoF_2. (2) A magnetic head characterized in that a part of the main body is sandwiched between structures in which a piezoelectric material is sandwiched between electrodes, and at least the part of the main body sandwiched between the structures is made of MnF_2.