JPH02302922A - Magnetic detecting element and magnetic storage device using the same - Google Patents

Abstract

PURPOSE:To make the sensitivity of a magnetic detection extremely high, and moreover, to record and reproduce information with common use of the same magnetic detecting element by providing an electric converting element to detect a force received with a magnetic substance having a head part in a specific shape being approximately corresponding to the shape of a recording bit, to convert it to an electric signal and to output it. CONSTITUTION:The magnetic detecting element is composed of a magnetic substance 1 and a piezoelectric element 2 to be the electric converting element for detecting the power to work to it, it is surrounded by a very thin shielding film 3, and they are housed in a cell 4. When the magnetic substance 1 is put into a leaking magnetic flux 7 on the surface of a magnetic bit 6 of a magnetic recording medium, the force is received, the force is converted to a voltage by the piezoelectric element 2, and it is detected as an output. In such a case, in order to detect the signal of the recording bit 6 with good efficiency, the shape of the magnetic substance 1 is approximately matched to the shape of the recording bit 6. Thus, the magnetic detecting element with high performance can be obtained, and it can be used for recording as well as for reproducing.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic sensing element for information recording and a magnetic storage device using the same, and in particular to a magnetic sensing element that has excellent recording and reproducing information, and particularly has excellent reproducing sensitivity. and a magnetic storage device using the same.

[Conventional technology]

In a magnetic disk device, recording and reproducing information on a magnetic recording medium is performed using a magnetic head. in general,
For example, an electromagnetic induction ring head is widely used as a magnetic head for recording and reproducing. In addition, in rigid magnetic disk drives used as recording devices in computers, etc., an induced current is generated in a magnetic head that floats with a very small space above the surface of a magnetic recording medium on a disk that rotates at high speed. Recording is performed on the magnetic recording medium by the magnetic field generated at the tip of the magnetic head. As magnetic recording density increases and the size of recording bits becomes finer, magnetic heads with high recording and reproducing efficiency are required. Previously, recording and playback were performed using the same ring head, but by separating the recording and playback elements,
Separate recording/reproducing magnetic heads are also being considered for the purpose of improving the efficiency of each function (Japanese Patent Laid-Open No. 11491/1983).
Publication No. 7). In this separate recording/reproduction type magnetic head, an element with particularly high sensitivity reproduction function is desired.
Magnetic detection element using magnetoresistance effect (Special Publication No. 53-17
404) or a magnetic detection element using a magnetically sensitive transistor (Japanese Unexamined Patent Publication No. 177573/1983). However, even when such an element is used, the magnetic detection sensitivity is still not sufficient for applications such as high-density magnetic recording of 100 Mb/in2 or more, and furthermore, it is difficult to say that the magnetic detection sensitivity is sufficient for applications such as high-density magnetic recording such as ring heads. There is a problem that they cannot be used for dual purposes in principle, so it is desired that an ideal magnetic head would be able to use the same element for both recording and reproduction, and be highly sensitive.

[Problem to be solved by the invention]

As mentioned above, the magnetic sensing elements in the prior art are still not fully satisfactory in terms of application to high-density magnetic recording (for example, 100 Mb/in2 or more), and the recording and reproduction of information is not the same. A highly sensitive magnetic detection element that can be used in combination with other elements has not yet been realized.

Therefore, as a result of extensive research into the realization of a highly sensitive magnetic detection element that can record and reproduce information using the same element, the present inventors have determined that the two-dimensional distribution of the magnetic domain structure of a magnetic material can be determined with high resolution. Based on this basic principle, we studied the configuration conditions for a magnetic detection element, replaced it with the currently used magnetic head, and improved the structure. has discovered a highly sensitive magnetic storage device that is simple and easy to use. That is, the measurement principle of magnetic force microscopy is described in, for example, the Journal of Vacuum Science and Technology, Aero
(2), (1988) pp. 279-282
Page (Journal of Vacuum
ce and Technology, A-6(2)
(1988) pp. 279-282), a needle-like tip made of a magnetic material is brought close to the measurement sample, and the sample surface is scanned two-dimensionally in a non-contact state to measure the magnetic force acting on the tip of the needle-like tip. It displays the strength and weakness as an image. The present invention applies the principle of this magnetic force microscope, and basically detects the force exerted on a magnetic body placed in a magnetic field, converts it into an electrical signal, and outputs it. be.

It is an object of the present invention to solve the above-mentioned problems in the prior art, and to achieve extremely high magnetic detection sensitivity by applying the basic principle of a magnetic force microscope, and to record and reproduce information using the same magnetic detection element. An object of the present invention is to provide a new type of magnetic detection element that can be used for both purposes and a magnetic storage device using the same.

[Means to solve the problem]

The object of the present invention is to provide a method in which the tip of a magnetic body that detects magnetism faces a magnetic recording medium and receives a force in a magnetic field leaking from a recording bit, which is a magnetic domain recorded on the magnetic recording medium.
This is achieved by providing a magnetic body having a tip portion having a specific shape that substantially corresponds to the shape of the recording bit, and an electrical conversion element that detects the force applied to the magnetic body, converts it into an electric signal, and outputs it.

In the magnetic sensing element of the present invention, the shape of the tip of the magnetic body disposed facing the magnetic recording medium is a rectangular parallelepiped or trapezoid whose width is smaller than the length of the recording bit and whose depth is approximately equal to the track width. Preferably, the shape is one of a columnar shape, a triangular prism shape, and a wedge shape.

As the magnetic body used in the magnetic detection element of the present invention, a soft magnetic material or a hard magnetic material such as a permanent magnet material can be selected and used depending on the purpose of magnetic detection. In addition, as an electrical conversion element that is bonded to a magnetic material, detects the force applied to the magnetic material, converts it into an electrical signal, and outputs it, a piezoelectric element or the like can be suitably used, for example. in this case,
The above force is converted into voltage and output.

In the magnetic sensing element of the present invention, in order to prevent forces other than magnetic force due to air flow or collision with foreign objects, an extremely thin shielding film is provided at a position a minimum distance in front of the tip of the magnetic material as described above. Form a compartment that airtightly surrounds a magnetic material to isolate it from the outside air, and either fill and replace the interior of the compartment with a gas that has a lower density than air, or maintain it at a reduced pressure lower than atmospheric pressure. It is desirable to have a structure that allows

Furthermore, in the magnetic detection element of the present invention, as a means for efficiently detecting leakage magnetic flux from a target recording bit of a recording medium, it is possible to prevent leakage magnetic flux emanating from adjacent recording bits from reaching the magnetic material. It is preferable to have a structure in which magnetic shielding materials for this purpose are placed between the magnetic bodies and placed at the front and back of the moving direction of the medium, or at the front and back and right and left positions of the medium moving direction.

Further, depending on the purpose of use, the magnetic sensing element of the present invention may have a structure in which a magnetic material is used as the main magnetic pole and an auxiliary magnetic pole is provided on the reflective side of the main magnetic pole with a magnetic recording medium sandwiched therebetween; The body serves as a main magnetic pole, and an auxiliary magnetic pole is formed on the same side as the main magnetic pole, and the piezoelectric element is attached directly or through an insulator made of an electrically insulating material to the side surface of the piezoelectric element that is joined to the magnetic body that is the main magnetic pole. A magnetic head having a structure in which the above-mentioned auxiliary magnetic pole is joined can be formed and suitably used as a high-density magnetic storage device.

Furthermore, in the magnetic detection element of the present invention, at least two electrical conversion elements (for example, piezoelectric elements) are bonded to the magnetic material,
and means for magnetizing both ends of the magnetic body to have N and S poles, adding, subtracting, multiplying and dividing the signals detected by the plurality of electrical conversion elements, and outputting an amplified signal after performing arithmetic processing. By providing this, magnetic detection can be performed with higher sensitivity.

A magnetic storage device that achieves ultra-high density recording by configuring a magnetic head for magnetic recording and reproducing using the highly sensitive magnetic detection element of the present invention and providing means for recording and reproducing a magnetic recording medium. can be realized.

[For production]

As a magnetic detection method, the present invention uses a method in which the force exerted on a magnetic body placed in a magnetic field is detected by, for example, a piezoelectric element, and the detected force is converted into a voltage and output. It is desirable that this magnetic body is housed in a compartment so that it is not subjected to force due to air flow when the magnetic detection element moves relative to the recording medium. Here, the principle of operation of the magnetic detection element of the present invention will be explained with reference to one drawing. Figure 1 shows
1 is an explanatory diagram showing an example of the configuration of a magnetic storage device of the present invention, and illustrating the operating principle of a magnetic detection element of the present invention. FIG. In the figure, the magnetic detection element (magnetic head) is composed of a magnetic body 1 and a piezoelectric element 2 for detecting the force acting on the magnetic body 1, and is installed at a position a minimum distance from the lower end of the magnetic body 1. Surrounded by an extremely thin shielding membrane 3, these are housed in a compartment 4. When the magnetic body 1 enters the leakage magnetic flux 7 on the surface of the magnetic bit 6 of the magnetic recording medium, it receives a force.

This force is converted into voltage by the piezoelectric element 2 and detected as an output. FIG. 2 shows how the force acting on the magnetic body 1 changes depending on the relative movement between the magnetic recording medium and the magnetic detection element, and the horizontal axis shows time or the distance of the relative movement. When the magnetic body 1 is a soft magnetic material, the force is applied depending only on the strength of the magnetic flux density, regardless of the direction of magnetization of the recording bit 6, so the change in force shown in FIG. 2 (A) occurs. is observed. If a hard magnetic material such as a permanent magnet magnetized with hard magnetism is used as the magnetic body 1, and the direction of magnetization is perpendicular to the surface of the magnetic recording medium, the magnetic property will change depending on the direction of magnetization of the recording bit 6. Since the body 1 receives an attractive force and a repulsive force, the change in force shown in FIG. 2(B) is observed.

Since the change in force can be converted into voltage by the piezoelectric element 2, it can be used for reproduction signal processing of a magnetic disk device.

In the magnetic detection element shown in FIG. 1, the shape of the magnetic body 1 must be approximately matched to the shape of the recording bit 6 in order to efficiently detect the signal of the recording bit 6. In magnetic recording, the shape of the recording bit 6 is usually rectangular, and a shape suitable for this is such that the side facing the magnetic recording medium is
Rectangular parallelepiped shape (a), trapezoidal columnar shape (b) as shown in Fig. 3,
Triangular prism shape (c) or wedge shape with rounded tip (
d) etc. are desirable. The dimensions of the tip need to be changed according to the dimensions of the recording bit 6, for example, the shape of a rectangular parallelepiped (a).
To explain this case, it is desirable that the width 0 is smaller than the length of 6 recording bits, and the depth W is approximately equal to the track width.

The magnetic body 1, which receives the force due to leakage magnetic flux from the recording bit 6, is configured to prevent any force other than magnetic force from acting as much as possible, or even if the above force acts, it can be distinguished from magnetic force to some extent. It is necessary to devise ways to do so. Forces other than magnetic force that may act on the magnetic body 1 include the force generated when airflow collides with the magnetic body 1, or when a magnetic detection element collides with a foreign object while traveling on a magnetic recording medium. These include the impact force generated by The force due to air flow is
As shown in FIG. 1, this can be prevented by housing at least the magnetic material 1 in a compartment 4 that is shielded from the outside air. Furthermore, if vibration of the air in the compartment 4 becomes a problem, He or H2, which has a lower density than air, may be filled. It is even more desirable if the interior of the compartment 4 is maintained in a vacuum. Since it is not easy to prevent the latter type of impact force, consideration should be given to, for example, attaching a small acceleration sensor to part of the magnetic detection element to measure the impact force and distinguish between magnetic forces at the signal processing stage. It is desirable to do so.

In order to efficiently detect the magnetic flux leaking from the recording bit 6 of the magnetic recording medium directly below the magnetic body 1 constituting the magnetic detection element shown in FIG. It is effective to prevent it from reaching the magnetic body 1. For this purpose, for example, as shown in FIG. 4, magnetic shielding materials 9 may be provided on both sides of the magnetic body 1 to absorb magnetic flux emitted from sources other than the recording bit targeted for detection.

Furthermore, it is possible to apply the magnetic body 1 used for magnetic flux detection as a magnetic pole for magnetic recording. In this case, the magnetic body 1 is made of a soft magnetic material such as permalloy, which is used for the magnetic poles of ordinary ring heads. The configuration of the magnetic detection element and magnetic recording medium when used for magnetic recording is described in the fifth section.
As shown in FIG. FIG. 5 shows a case where magnetic recording is performed by using the magnetic body 1 as the main pole and exciting it with the auxiliary pole 10 provided on the opposite side of the magnetic recording medium. FIG. 6 shows an example in which the auxiliary magnetic pole 10 is installed on the same side as the magnetic body 1 to form an integrated magnetic detection element. Also, the 6th
In the figure, a magnetic material is provided on the side surface of the piezoelectric element 2 directly or via an insulator 13 made of an electrically insulating material to form a magnetic path. If the amount of deformation of the piezoelectric element 2 is within the range of elastic deformation of the magnetic material provided on the side surface, problems such as breakage of the magnetic material will not occur.

As another example of the configuration in which the magnetic detection element of the present invention is applied to a magnetic recording device, as shown in FIG. It is also possible to use the amplified signal after adding, subtracting, multiplying, and dividing and performing arithmetic processing. Using a hard magnetic material as the magnetic body 1, the seventh
As shown in the figure, if both ends are magnetized so that they become N and S poles, and the horizontal direction (N-8 direction) is aligned with the track direction of recording bit 6, the N and S poles will have opposite directions. Force acts. In this case, by taking the difference between the voltages detected by the respective piezoelectric elements 2, it is possible to observe the signal as a larger signal. Furthermore, if the magnetic detection element deviates from directly above the track of the recording medium to either the left or the right, it can be detected as an imbalance in the output between the piezoelectric elements 2, and it can also be used as a signal for tracking the magnetic detection element.

〔Example〕

An embodiment of the present invention will be described below in more detail based on the drawings.

(Example 1) A magnetic detection element was produced according to the procedure shown in (,) to d) of FIG. First, we processed zirconia material to a width of 500 μm.
m, at the bottom of the groove of the base material 8 in which a groove with a depth of 500 μm was formed,
A metallic electrode film 15 having a thickness of 0.5 μm was formed. On the electrode film 15, PbZrO3 and PbTi0.
A piezoelectric element 2 made of solid solution ceramic was deposited. The dimensions of the piezoelectric element 2 in the lateral direction and height direction in FIG. 8(a) were 300 μm and 490 μm, respectively. As shown in FIG. 8(b), the piezoelectric element 2 has a thickness of 0.
A 5 μm metal electrode film 15 is formed, and a 1 μm metal electrode film 15 is formed on it.
Photoresist 16 was provided at intervals of . Permalloy, a soft magnetic material, was deposited by sputtering through a vapor deposition mask, and then the photoresist was removed by dry etching, and magnetic material 1, which was a permalloy film processed into a trapezoidal column shape, was formed on piezoelectric element 2. Figure 8 (C)].

After filling the groove portion of the base material 8 with the resin 17, the upper end portion is processed into a curved surface shape as shown in FIG.
A thick shielding film 18 made of diamond-like carbon was formed by high frequency sputtering. The cross-sectional shape is shown in Figure 8(d).
A prismatic sample shown in was cut at a pitch of 20 μm, and after the resin was dissolved and removed by chemical treatment, thin plates approximately equal to the cross-sectional outline of the cut surface were pasted on both sides of the cut surface. When bonding the thin plates together, lead wires were drawn out from the electrode films 15 formed at the upper and lower ends of the piezoelectric element 2, respectively. Through the above procedure, a magnetic sensing element having a cross-sectional structure substantially similar to that shown in FIG. 1 above was manufactured.

(Example 2) In the manufacturing process of the magnetic detection element shown in Example 1, a permanent magnetic material (
Fe-12tit%C of hard magnetic material).

-24wt%Cr alloy was deposited by sputtering method.
A magnetic detection element was produced in the same manner as in Example 1.

This magnetic detection element was placed in a magnetic field and magnetized so that the side of the magnetic body 1 made of a permanent magnet material in contact with the piezoelectric element became a N pole and the opposite side became an S pole.

(Example 3) A magnetic detection element in which magnetic shielding materials 19a and 19b were arranged on both sides of the magnetic body 1 was manufactured in the steps shown in FIGS. 9(a) to 9(f). First, a magnetic shielding material 19a made of a Co-Nb-Zr alloy, which is a soft magnetic material, is attached to a thickness of 0.5 μm by sputtering on a ferrite base material 8a processed into the shape shown in FIG. It was formed to a film thickness of . A resin film 20a having a thickness of 0.1 μm was applied thereon, and then a piezoelectric element 2 made of BaTiO3-CaTiO3 material was fixed thereto [FIG. 9(b)]. Next, a Co-Nb-Zr alloy film was formed on the side surface of the piezoelectric element 2 by sputtering to a thickness of 0.15 μm to form the magnetic body 1.
Further, a resin film 20b having a thickness of 0.1 μm was coated thereon [FIG. 9(c)]. Further, as shown in FIG. 9(C), Co--Nb was applied to the side surface of the pair of base materials 8b by sputtering.
- Magnetic shielding material 1 with a thickness of 0.5 μm made of Zr alloy
9b was formed. These two base materials 8a and 8b were joined as shown in FIG. 9(d), the lower end of the joined body was polished to make it flat, and then cut to a thickness of 1+ nm with a diamond cutter [FIG. 9( e)]. Next, the tip of the magnetic body 1 is polished diagonally so that the thickness in the depth direction is 5 μm, and the left and right sides of the lower end are chamfered, and the resins 20a and 20b are
was removed to produce a magnetic herad chip shown in FIG. 9(f). Then, a cover is provided on the diagonally polished front and rear surfaces so as not to touch the magnetic material 1 at least, and the piezoelectric element 2 is
A magnetic detection element was fabricated by attaching electrodes to the . In this embodiment, the tip of the magnetic body 1 is not covered, but the distance between the magnetic shielding materials 19a and 19b is as small as 0.1 μm, and as the magnetic detection element moves, the magnetic body The effect of the air flow directly impinging on 1 was so small that it could be omitted.

(Example 4) A magnetic detection element was produced in the same manner as in Example 3, except that the material of the magnetic body 1 was Fe-28%Cr-81t%CO, which is a permanent magnet material. . In addition, by processing in a magnetic field, the open end side of the magnetic body 1 was magnetized so that it became a north pole, and the side joined to the piezoelectric element 2 became a south pole.

(Example 5) A magnetic sensing element having a cross-sectional structure shown in FIG. 6 was manufactured by a process similar to that of Example 3. The material of the magnetic body 1 is permalloy, and the dimension of the end face facing the recording medium is @0
゜25 μm and depth 3 μm.

The auxiliary magnetic pole 10 was made of soft magnetic Mn-Zn ferrite, and a coil 12 was provided near the joint with the magnetic material 1.

As the piezoelectric element 2, a B' a T No j type material is used, and S'0 is used between it and the permalloy film formed on the side surface.
An insulator 13 having a thickness of 0.05 μm was provided.

(Example 6) A magnetic sensing element having the cross-sectional structure shown in FIG. 7 was produced by a method similar to Example 1. 5IIICo as magnetic material 1
5, and the dimensions are lI! f10μm, depth 0.2μm,
The height was set to 2 μm. The two piezoelectric elements 2 are B a T 1
03 material was used. The compartment 4 had a sealed structure against the outside air, and was filled with He at 1 atm.

Characteristic evaluations of the magnetic sensing elements produced in Examples 1 to 6 above were performed under the following conditions. As a comparison standard for evaluation, a ring head made of ferrite material with a gap length of 0.2 μm, a track width of 5 μm, and a coil with 34 turns was used. A 5-inch diameter rigid magnetic disk was used as the magnetic recording medium. The magnetic film is a Co-based alloy film with a coercive force of 9
000 e, saturation magnetization 600 emu/cc,
Magnetic recording was performed at 30 kPCI with a track width of 5 μm. The distance between the magnetic pole tip of each magnetic sensing element and the surface of the magnetic recording medium was 0.3 μm, and the relative motion speed between the magnetic sensing element and the magnetic recording medium was 10 m/s. Table 1 shows a relative comparison of the reproduction output and signal/noise ratio (S/N) of the magnetic detection elements fabricated in each of the above examples with that of the ring head.
”C shows・Left below margin 1st
As shown in Table 1, the magnetic sensing elements manufactured in Examples 1 to 6 of the present invention all had higher reproduction outputs, extremely high S/N ratios, and exhibited excellent magnetic recording and reproduction characteristics. You can see what it shows.

In addition, as shown in FIG. 5, the magnetic sensing elements fabricated in Example 1 and Example 3 are sandwiched between the magnetic recording medium and the auxiliary magnetic poles 10 are placed opposite each other, and by exciting the auxiliary magnetic poles 10, a magnetic field composed of a perpendicularly magnetized film is generated. It could also be used to record on recording media. It was also confirmed that magnetic recording could be performed with the configuration shown in FIG. 6 by passing a current through the coil of the magnetic sensing element produced in Example 5.

〔Effect of the invention〕

As explained in detail above, according to the magnetic storage device using the magnetic detection element according to the present invention, the reproduction sensitivity of magnetic recording can be greatly improved, so that the spacing between the magnetic recording medium and the magnetic detection element can be reduced to some extent. Sufficient S/N even with high speed
It is possible to obtain an extremely high-performance magnetic detection element that can perform reproduction while retaining the magnetic flux, and can also sufficiently handle ultra-high-density recording that requires highly sensitive detection of weak leakage magnetic flux.

Furthermore, it has the feature that it can be used not only for playback but also for recording, making it possible to realize a storage device that can perform extremely high-density recording, which is also excellent in practical terms.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams showing the operating principle of the magnetic detection element of the present invention, FIG. 3 is a perspective view showing an example of the shape of the magnetic body in the magnetic detection element of the present invention, and FIG. FIGS. 5 and 6 are explanatory diagrams showing the operation when the magnetic detection element of the present invention is applied to magnetic recording, and FIG. 7 is a schematic diagram showing an example of the configuration of the magnetic detection element of the present invention. An explanatory diagram showing another example of the structure of the element, FIG. 8 is an explanatory diagram showing the manufacturing process of the magnetic detection element exemplified in Example 1 of the present invention, and FIG. It is an explanatory view showing a manufacturing process of a magnetic sensing element. ■... Magnetic material 2... Piezoelectric element 3... Shielding film 4... Compartment 5... Substrate 6... Recording bit (magnetic recording film) 7... Leakage magnetic flux 8.8a, 8b ・Base material 9
...Magnetic shielding material 10...Auxiliary magnetic pole 11...
Magnetic flux 12...Coil 13...Insulator
14... High magnetic permeability film 15... Electrode film
16... Photoresis 1-17... Resin
18... Shielding film 19a, 19b... Magnetic shielding material 20a, 20b-resin film

Claims (1)

[Scope of Claims] 1. The tip of the magnetic body faces a magnetic recording medium and receives force in a magnetic field leaking from a recording bit, which is a magnetic domain recorded on the magnetic recording medium, and the shape of the recording bit is What is claimed is: 1. A magnetic detection element comprising: a magnetic body having a tip having a specific shape that substantially corresponds to the magnetic body; and an electric conversion element that detects the force applied to the magnetic body, converts it into an electric signal, and outputs it. 2. In the magnetic sensing element according to claim 1, the shape of the tip of the magnetic material disposed facing the magnetic recording medium has a width smaller than the length of the recording bit and a depth equal to the track width. A magnetic sensing element characterized in that it has a substantially equal shape selected from among a rectangular parallelepiped shape, a trapezoidal columnar shape, a triangular columnar shape, and a wedge shape. 3. A magnetic detection element according to claim 1 or 2, characterized in that the magnetic body is made of a soft magnetic material. 4. A magnetic detection element according to claim 1 or 2, characterized in that the magnetic body is made of a hard magnetic material. 5. The magnetic detection element according to claims 1 to 4, wherein the electric conversion element that detects the force applied to the magnetic body, converts it into an electric signal, and outputs it is a piezoelectric element. detection element. 6. The tip of the magnetic material faces the magnetic recording medium, receives force in a magnetic field leaking from a recording bit that is a magnetic domain recorded on the magnetic recording medium, and has a specific shape that substantially corresponds to the shape of the recording bit. A magnetic body having a shaped tip, an electric conversion element that detects the force applied to the magnetic body, converts it into an electric signal, and outputs it, and an ultra-thin A shielding film is provided to airtightly enclose the magnetic material to form a compartment that is isolated from the outside air, and the interior of the compartment is filled with a gas having a lower density than air, or is heated to a temperature lower than atmospheric pressure. 1. A magnetic detection element characterized by having a structure that maintains a low decompression state. 7. In the magnetic detection element according to claims 1 to 6, as a means for efficiently detecting leakage magnetic flux from a target recording bit of a magnetic recording medium, leakage magnetic flux emanating from adjacent recording bits is used. In order to prevent the magnetic material from reaching the magnetic material, magnetic shielding materials are installed in the front and back of the moving direction of the medium, or in the front and back and left and right positions of the moving direction of the medium, sandwiching the magnetic material. Characteristic magnetic detection element. 8. The magnetic sensing element according to claims 1 to 7, characterized in that a magnetic material is used as the main magnetic pole, and an auxiliary magnetic pole is provided on the reflective side of the main magnetic pole, sandwiching the magnetic recording medium. magnetic sensing element. 9. In the magnetic sensing element according to claims 1 to 8, a magnetic material is used as a main magnetic pole, an auxiliary magnetic pole is formed on the same side as the main magnetic pole, and is joined to the magnetic material that is the main magnetic pole. A magnetic sensing element characterized in that the auxiliary magnetic pole is connected to a side surface of a piezoelectric element directly or through an insulator made of an electrically insulating material. 10. In the magnetic detection element according to claims 1 to 9, at least two electrical conversion elements are bonded to a magnetic body, and both ends of the magnetic body are magnetized to form N and S poles. A magnetic detection element characterized in that it has means for adding, subtracting, multiplying and dividing the signals detected by the plurality of electrical conversion elements, and using an amplified signal after performing arithmetic processing. 11. A magnetic head for magnetic recording and reproducing is configured using the magnetic sensing element according to any one of claims 1 to 10, and has means for recording and reproducing a magnetic recording medium. Features of magnetic storage device.