JPH0845026A - Magneto-resistive magnetic head - Google Patents

Abstract

PURPOSE:To absorb the heat generated in an magneto-resistive element (MR element) and to increase the sense current to the MR element so as to improve reproduced output by providing the magnetic head with an electron cooling element as near as the MR element as possible. CONSTITUTION:This magnetic head has a pair of shielding magnetic materials 2, 3 on one side face of a slider 1 and the MR element 6 formed by laminating a front end electrode 4 and a rear end electrode 5 between these magnetic materials 2 and 3. The head has also a bias conductor 7 for impressing a bias magnetic field on the MR element 6 and the electron cooling element 12 which is disposed in a part of the bias conductor 7 and exhibits a Peltier effect right above the MR element 6. As a result, the heat generated in the MR element 6 by the energization of the sense current is absorbed by the electron cooling element 12. Then, the sense current to the MR element 6 is increased and the output is improved. Since the heat radiated from the MR element 6 is absorbed, the thermal deterioration of the MR element 6 is averted and the continuous energization life of the MR head is greatly prolonged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetoresistive effect magnetic head useful for, for example, a hard disk drive.

[0002]

2. Description of the Related Art In recent years, a magnetoresistive effect type magnetic head (hereinafter referred to as MR head) using a magnetoresistive effect element (hereinafter referred to as MR element) such as permalloy having a magnetoresistive effect has been actively developed. Has been.

In such an MR head, the resistance of the MR element made of permalloy changes due to the signal magnetic flux leaking from the magnetic recording medium, and the information recorded on the magnetic recording medium can be read by detecting the change in the resistance. It is done like this.

Such an MR head is superior in short wavelength sensitivity to a general electromagnetic induction type magnetic head (hereinafter referred to as an inductive head), and therefore, in narrow track reproduction, short wavelength reproduction, and ultra-low speed reproduction. It is said that high sensitivity can be obtained.

In general, an MR head has, for example, Al ₂ O ₃
By having an MR element made of permalloy on one side surface of a base body called a slider made of -TiC or the like, electrodes are provided at both ends in the longitudinal direction of the MR element, and a sense current is passed between these electrodes. The resistance change due to the magnetic flux entering the MR element from the medium can be extracted as a voltage change.

[0006]

As described above, in the MR head, it is necessary to flow a sense current through the MR element in order to extract the output signal. For this reason, the current that can flow in the MR element is limited by the Joule heat generated by passing the sense current. Therefore, the head cannot be used at the maximum output, which hinders the high output of the head.
The influence of such heat generation causes thermal deterioration of the MR element film, disconnection due to migration, shortening of the head life, and the like, which is disadvantageous in terms of reliability.

Up to now, as a measure against heat generation of the MR element,
A method of radiating heat to the air by exposing the MR element to the surface and a method of accelerating heat radiation by covering the MR element with a material having good thermal conductivity have been adopted.

However, these methods are not sufficient, and the current state is that the maximum energizing current of the MR element is determined and the MR element is used while suppressing heat generation.

Therefore, the present invention has been proposed in view of the above-mentioned technical problems of the related art, and absorbs the heat generated by the MR element to increase the sense current to the MR element and reproduce output. It is an object of the present invention to provide an MR head that realizes the improvement of

[0010]

In the present invention, an electronic cooling element exhibiting a Peltier effect is provided in order to suppress heat generation of the MR element and increase the sense current to the MR element to improve the reproduction output.

The place where the electronic cooling element is provided is preferably as close as possible to the MR element in order to efficiently absorb the heat radiated from the MR element. For example, at least one of the bias conductor, the front electrode and the rear electrode. It is desirable to install it in one place. Of course, it may be provided on all of the bias conductor, the front electrode, and the rear electrode. However,
When the electronic cooling element is provided on the bias conductor, it is necessary to apply it to a so-called current bias type MR head in which a current is applied to the bias conductor to apply a bias magnetic field to the MR element.

The MR head provided with this electronic cooling element is a so-called vertical MR head having an MR element whose longitudinal direction is perpendicular to the surface facing the magnetic recording medium, or the MR head. It does not matter whether it is a so-called lateral MR head having an MR element whose longitudinal direction is parallel to the surface.

The vertical MR head is arranged so that its longitudinal direction is perpendicular to the surface facing the magnetic recording medium, and one side edge on the tip side faces the medium facing surface. And a magnetoresistive effect element, a tip electrode laminated on the tip side of the magnetoresistive element, and one edge of the tip side facing the medium facing surface, and a magnetoresistive element laminated on the rear end side of the magnetoresistive element. An end electrode, a pair of shield magnetic bodies that sandwich the magnetoresistive effect element in which the front electrode and the rear end electrode are laminated from the film thickness direction, and a bias conductor that applies a bias magnetic field generated by current application to the magnetoresistive effect element. It has a configuration including and. The lateral MR head is a magnetoresistive element that is arranged such that its longitudinal direction is parallel to the surface facing the magnetic recording medium, and one side edge on the tip side faces the medium facing surface. And a pair of electrodes that are stacked on both ends in the longitudinal direction of the magnetoresistive effect element and that are drawn out rearward from the medium facing surface in a direction perpendicular to the medium facing surface.

In both the vertical MR head and the horizontal MR head, the electric circuit including the MR element and the bias conductor provided with the electronic cooling element exhibiting the Peltier effect are connected in series or in parallel. May be.

[0015]

In the MR head according to the present invention, since the electronic cooling element exhibiting the Peltier effect is provided inside the element, the heat generated in the MR element due to the passage of the sense current is absorbed by the electronic cooling element. . Therefore, M
The sense current to the R element can be increased, and the output of the MR element can be improved. In addition, the MR can be
Since the heat radiated from the element is absorbed, thermal deterioration of the MR element is avoided and the continuous energization life is greatly extended.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings.

Embodiment 1 In this embodiment, an electric circuit including an MR element and a bias conductor are connected in series, and an electronic cooling element is provided on the bias conductor.

As shown in FIGS. 1 and 2, the MR head of this embodiment has a pair of shield magnetic bodies 2, 3 formed on one side surface of a slider 1 made of Al ₂ O ₃ --TiC or the like.
And an MR element 6 in which a front end electrode 4 and a rear end electrode 5 are laminated between these shield magnetic bodies 2 and 3, and this MR element 6
And a bias conductor 7 for applying a bias magnetic field.

Hereinafter, the shield magnetic body 2 formed in the lower layer will be referred to as the lower shield magnetic body 2, and the shield magnetic body 3 formed in the upper layer will be referred to as the upper shield magnetic body 3.

The MR element 6 is formed, for example, in a substantially rectangular pattern in a plan view, and is provided such that its longitudinal direction is perpendicular to a surface facing the magnetic recording medium (hereinafter referred to as ABS surface 8). The one side edge of the tip side thereof faces the ABS surface 8. The MR element 6 is made of, for example, a ferromagnetic thin film such as permalloy, and is formed on the lower shield magnetic body 2 by a vacuum thin film forming means such as vapor deposition or sputtering via an insulating film 9 functioning as a lower gap film. ing.

The MR element 6 may be a single layer film of a thin film element made of permalloy, but a pair of thin film elements magnetostatically coupled via a non-magnetic insulating layer made of, for example, SiO ₂ is used. It may have a laminated film structure in which the layers are laminated. With the laminated film structure, it is possible to avoid the occurrence of Barkhausen noise.

The tip electrode 4 is directly laminated on the tip of the MR element 6 so that one side edge thereof faces the ABS 8 and is electrically connected to the MR element 6.
The tip electrode 4 has a function as an electrode for supplying a sense current to the MR element 6, and also as an upper gap film of the reproducing magnetic gap.

On the other hand, the rear end electrode 5 is laminated so as to partially overlap the rear end portion of the MR element 6, and is drawn out to the rear side of the element on the side opposite to the ABS surface 8. The drawn out conductor portion of the rear end electrode 5 is connected in series with a bias conductor 7 which will be described later.

The bias conductor 7 is for applying a bias magnetic field to the MR element 6, and includes the front electrode 4 and the rear electrode 5.
And is provided in a direction orthogonal to the longitudinal direction of the MR element 6. The bias conductor 7 includes
A direct current is supplied from a constant current source (not shown). The bias magnetic field generated by this current is
It is adapted to be applied to the MR element 6 in the longitudinal direction thereof.

The pair of shield magnetic bodies 2 and 3 provided so as to sandwich the MR element 6 from above and below,
It functions as a shield that is not affected by the magnetic field from the medium located away from the MR element 6, and is formed of, for example, permalloy or sendust.

The lower shield magnetic body 2 has the ABS surface 8
Is provided so as to face one side edge thereof in the direction perpendicular to the ABS surface 8. On the other hand, the upper shield magnetic body 3 provided so as to face this is perpendicular to the ABS surface 8 so that one side edge thereof is faced to the ABS surface 8 like the lower shield magnetic body 2 described above. It is provided to extend to the back side. The upper shield magnetic body 3 is directly laminated on the ABS 8 side with respect to the tip electrode 4, and an insulating layer 10 for ensuring insulation with the MR element 6 and the bias conductor 7 is provided on the rear side thereof. Are stacked.

In addition, behind the upper shield magnetic body 3,
A conductor pattern 13 electrically connected to the upper shield magnetic body 3 is connected. A protective film 11 for protecting the head element is laminated on the upper shield magnetic body 3.

In particular, in this MR head, the electronic cooling element 12 showing the Peltier effect in a part of the bias conductor 7.
Is provided. The electronic cooling element 12 is an element that causes heat generation or heat absorption at the bonding surface when a current is passed between two different metals. This phenomenon is called the Peltier effect.
The Peltier effect is expressed by the following equation (1).

Qp = π × Is Equation (1) (π: Peltier coefficient, Is: current flowing in the element exhibiting the Peltier effect) The heat generated in the MR element is expressed by the following equation (2). It

Qmr = Rmr × Is ² (2) Formula (Rmr: Resistance of MR Element) As the electronic cooling element 12 exhibiting the Peltier effect, for example, a combination of two kinds of metals shown in Table 1 can be mentioned. .

[0031]

[Table 1]

In Table 1, the positive Peltier coefficient indicates heat generation and the negative Peltier coefficient indicates heat absorption. The larger the coefficient, the larger the calorific value or the calorific value. However, even if the Peltier coefficient is positive, heat is absorbed by changing the direction of the current passed through these metals. Therefore, all the electronic cooling elements 12 listed in Examples 1 to 6 shown in Table 1 can be used.

The place where the electronic cooling element 12 is provided is M
In order to efficiently absorb the heat generated by the R element 6, it is provided as close to the MR element 6 as possible. In this embodiment, the electronic cooling element 12 is provided directly above the MR element 6 shown by the diagonal lines in FIG.

As shown in FIG. 3, for example, the electronic cooling element 12 is composed of a first metal film 12a and a second metal film 12b exhibiting a Peltier effect, and these metal films 12a, 12b.
Is provided in the middle of the bias conductor 7.

The first metal film 12a is provided so as to partially overlap the edge portion 7a of the bias conductor 7. Then, a second metal film 12b is provided at the rear end portion of the first metal film 12a so that the second metal film 12b partially overlaps. In addition, at the rear end portion of the second metal film 12b,
The end portions 7b of the bias conductor 7 are provided so as to overlap each other. The electronic cooling element 12 including the first metal film 12a and the second metal film 12b is formed by sputtering or vapor deposition in the order of the left bias conductor 7, the first metal film 12a, the second metal film 12b, and the bias conductor 7. Is formed by

In the MR head constructed as described above, the electric circuit including the MR element 6 and the bias conductor 7 provided with the electronic cooling element 12 are connected in series. Therefore, a bias magnetic field is applied in the longitudinal direction of the MR element 6 by the current flowing through the bias conductor 7, and the current flows through the electronic cooling element 12, whereby the first metal film 12a and the second metal film 12b are separated. An endothermic phenomenon occurs at the joint surface S. As a result, the heat generated in the MR element 6 is absorbed by the electronic cooling element 12,
The sense current to the element 6 can be increased, and the reproduction output can be increased. Further, since the heat generated by the MR element 6 is absorbed by the electronic cooling element 12, the thermal deterioration of the MR element 6 can be prevented, the continuous energizing life can be greatly extended, and the maximum energizing current can be secured large. Furthermore, since the heat resistance in a high temperature atmosphere is improved, the reliability is also secured.

The reason why these effects are obtained is based on the following data. First, FIG. 4 shows the relationship between the estimated temperature due to heat generation of the MR element and the sense current. This figure is calculated assuming that the resistance of the MR element at room temperature is 8Ω. The dimensions of the MR element at this time are 20 nm in thickness, width, and length, respectively.
(2 layers) × 3.75 μm × 11 μm.

The disconnection of the MR element (shaded area) occurs at a sense current of 40 to 45 mA, but the sense current is actually limited to 35 mA due to film deterioration of the MR element.

Further, FIG. 5 shows the estimated life of the MR head with continuous energization. From this table, the used current Is = 15
The estimated life when continuously energized with mA is approximately 20,000 hours (2
Year). From this figure, the only way to extend the life of the head is to reduce the current used or increase the efficiency of heat dissipation.

Here, the amount of heat when Sb is used for the negative electrode and Bi is used for the positive electrode as the electronic cooling element provided on the bias conductor will be calculated. The resistance Rmr of the MR element is 8Ω, the Peltier coefficient π is +448 mV, and the heat absorption efficiency of the electronic cooling element is 50%.
Then, the difference ΔQ in the amount of heat between the MR element and the electronic cooling element is
It is expressed by the following equation (3).

ΔQ = Qmr−Qp = Rmr × Is ² −0.5 × π × Is = 8Is ² −0.5 × 0.448Is (3) Equation (3) is a virtual ΔQ 6 shows. FIG. 6 shows data when Sb is used for the positive electrode and Bi is used for the negative electrode as the electronic cooling element. The temperature at which the film deterioration of the MR element occurs is about 2
The current is 80 degrees and the sense current is 35 mA. MR at this time
Calorific QMR of elements, Qmr = 8 × 0.035 ² =
It becomes 9.8 (mW).

In order to obtain ΔQ = 9.8 mW in the equation (3), it is possible to flow up to Is = 50 mA when an electronic cooling element is provided. Also, up to a sense current of 30 mA,
The calorific value is also kept low. Therefore, the life of the device can be expected to be extended.

The operating current region to be operated can be changed by using materials having different Peltier coefficients. For example, FIG. 7 shows ΔQ when Cu is used for the negative electrode and Constantan is used for the positive electrode as the electronic cooling element, and π = 0.102 mV. When such an electronic cooling element is used, ΔQ
To reach 9.8 mW, Is can flow up to about 37.5 mA.

Embodiment 2 In this embodiment, as shown in FIG. 8, an electric circuit including the MR element 6 and a bias conductor 7 are connected in parallel, and an electronic cooling element 12 is provided on the bias conductor 7. Is.
Other configurations are the same as those in the first embodiment.

In the MR head of this embodiment as well, as in the MR head of the first embodiment, the electronic cooling element 12 causes an endothermic phenomenon due to the current flowing through the bias conductor 7 and absorbs the heat generated in the MR element 6. It has become. Therefore, the sense current to the MR element 6 can be increased, and the reproduction output can be increased.

Example 3 In this example, an electronic cooling element is used for the tip electrode.

As shown in FIG. 9, the MR head of the present embodiment has a structure in which the electronic cooling element 12 is provided at the tip electrode portion of the vertical MR head of the first embodiment.
Regarding the same members as the MR head of Example 1,
The same reference numerals are given and the description thereof is omitted.

That is, the first metal film 12a and the second metal film 12 exhibiting the Peltier effect at the tip of the MR element 6 via the base film 14 so that one side edge faces the ABS surface 8.
An electronic cooling element 12 in which b is sequentially stacked is provided.

As the electronic cooling element 12, any one of the examples 1 to 6 shown in Table 1 can be used.
In this example, Cu is used as the first metal film 12a and Constantan is used as the second metal film 12b. The base film 14 provided under the electronic cooling element 12 ensures the adhesion between the first metal film 12a and the MR element 6, and
It is provided so as not to deteriorate the magnetic characteristics.

The base film 14 and the first metal film 12 are
The a and the second metal film 12b function as a tip electrode.

In the MR head having such a structure, the rear end electrode 5
The electronic cooling element 12 causes a heat absorption phenomenon by the sense current Is flowing from the side to the MR element 6, and absorbs the heat generated in the MR element 6. As a result, the sense current to the MR element 6 can be increased, and a large reproduction output can be secured.

Further, this MR head can be applied to any one in which the electric circuit including the MR element 6 and the bias conductor 7 are connected in series or in parallel as long as the electric current can be passed through the electronic cooling element 12. Further, in addition to the structure of the MR head of the third embodiment, an electronic cooling element may be provided on the bias conductor.

Embodiment 4 In this embodiment, an electronic cooling element is provided on the rear end electrode.

In the MR head of this embodiment, FIG.
As shown in FIG. 5, the vertical MR head of Example 1 has a structure in which the electronic cooling element 12 is used in the rear end electrode portion. The same members as those of the MR head of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

That is, the electronic cooling element 12 is provided between the MR element 6 and the rear end electrode 5. The electronic cooling element 12 has a configuration in which the first metal film 12a and the second metal film 12b shown in FIG. 3 are formed in contact with each other as described in Embodiment 1, and the combination of the metal films is also shown in Table 1. The ones listed in are used.

Since Cu is usually used for the rear end electrode 5, the Cu is not provided between the MR element 6 and the rear end electrode 5.
By providing a metal film exhibiting a Peltier effect in combination with, the electronic cooling element 12 is formed.

In the MR head having such a structure, the sense current Is flowing from the rear end electrode 5 side to the MR element 6 causes the thermoelectric cooling element 12 to absorb heat, and the heat generated in the MR element 6 is efficiently generated. Absorb. As a result, the sense current to the MR element 6 can be increased and the reproduction output can be increased.

Further, this MR head can be applied to any one in which the electric circuit including the MR element 6 and the bias conductor 7 are connected in series or in parallel as long as the electric current can be passed through the electronic cooling element 12. Further, in addition to the structure of the MR head of the fourth embodiment, an electronic cooling element may be provided on the bias conductor.

Embodiment 5 This embodiment is an example in which electronic cooling elements are provided on both the front electrode and the rear electrode.

FIG. 11 shows the MR head of this embodiment.
As shown in FIG. 5, the MR head of Example 3 and the MR head of Example 4
This is a combination of heads and has a structure in which the electronic cooling element 12 is used for the rear end electrode of the MR head of the third embodiment. The same members as those of the MR head of the third embodiment are designated by the same reference numerals, and the description thereof will be omitted.

That is, this MR head has a structure in which the electronic cooling elements 12 are provided on both the front electrode and the rear electrode. As the electronic cooling element 12, those listed in Table 1 are used. As described above, when the electronic cooling elements 12 are provided on both the front electrode and the rear electrode, the heat generated by the MR element 6 is absorbed by the electronic cooling elements 12 before and after the cooling, so that the cooling can be performed more efficiently. You can
Thereby, the sense current to the MR element 6 can be increased, and the reproduction output can be further increased.

Also, this MR head can be applied to either an electric circuit including the MR element 6 and the bias conductor 7 connected in series or in parallel.

Embodiment 6 This embodiment is an example in which electronic cooling elements are used for both the front electrode and the rear electrode, and electronic cooling elements are also used for the bias conductor.

The MR head of the present embodiment has a structure in which the electronic cooling element 12 is provided on the bias conductor 7 in addition to the MR head of the fifth embodiment. In addition to the structure in which the electronic cooling element 12 is used for both the front electrode and the rear electrode, the electronic cooling element 12 is also provided in the bias conductor 7,
The heat generated in the MR element 6 can be absorbed more efficiently than in the MR head of the fifth embodiment, and further improvement of the reproduction output can be expected. Also, this MR head can be applied to either an electric circuit including the MR element 6 and the bias conductor 7 connected in series or in parallel.

FIG. 12 is a characteristic diagram based on the calculation results of the virtual ΔQ in the MR head of the third embodiment, the MR head of the fifth embodiment, and the MR head of the sixth embodiment. The heat absorption efficiency is 50% in all cases. As is clear from this result, better results are obtained when the electronic cooling element is used not only for the front electrode but also for the rear electrode. It can be seen that even better results are obtained when the electronic cooling element is used for the bias conductor in addition to the front end electrode and the rear end electrode.

Embodiment 7 In this embodiment, the so-called horizontal type, in which the MR element is arranged so that its longitudinal direction is parallel to the ABS surface, and one side edge on the front end side faces the ABS surface, It is an example of an MR head.

In the MR head of this embodiment, as shown in FIG. 13, the MR element is arranged so that one longitudinal edge of the MR head faces the ABS surface and its longitudinal direction is parallel to the ABS surface. 6 and the MR element 6 are laminated on both ends in the longitudinal direction of the MR element 6, and
It is composed of a pair of electrodes that are drawn out rearward of the surface and an electronic cooling element 12 provided on the electrodes.

As the MR element 6, for example, a thin film element made of permalloy is used. Below the MR element 6, a non-magnetic film 15 made of Ti, Ta, Cr or the like and a SAL film 16 for stabilizing the magnetization direction of the MR element 6 are provided.

The electronic cooling element 12 is composed of a first metal film 12a and a second metal film 12b exhibiting a Peltier effect.
As the combination of the first metal film 12a and the second metal film 12b, any of the examples 1 to 6 shown in Table 1 described above can be applied. In this embodiment, Bi is used for the first metal film 12a on the left side of the drawing, Fe is used for the first metal film 12b on the right side, and Cu is used for both the left and right sides of the second metal film 12b.

The second metal film 12b made of Cu is
In addition to the function as the electronic cooling element 12, it also functions as a conductor pattern as an electrode. That is, the electronic cooling element 1
Part of 2 acts as an electrode.

In the lateral MR head having such a structure, when the sense current Is flows from one electrode, it flows through the MR element 6 to the other electrode. An endothermic phenomenon occurs at the interface between the metal film 12a and the second metal film 12b. Therefore,
The heat generated in the MR element 6 is efficiently absorbed, the sense current to the MR element 6 can be increased, and a large reproduction output can be obtained.

[0072]

As is clear from the above description, in the MR head of the present invention, the electronic cooling element exhibiting the Peltier effect is used at at least one of the front electrode, the rear electrode and the bias conductor. Therefore, the heat generated in the MR element can be absorbed by the electronic cooling element, the sense current supplied to the MR element can be increased, and the reproduction output can be improved.

Further, since the heat generation of the MR element can be suppressed,
The thermal deterioration of the MR element can be prevented, the continuous energization life can be extended, and the maximum energization current can be increased. Furthermore, since the heat resistance in a high temperature atmosphere is improved,
Reliability also increases.

[Brief description of drawings]

FIG. 1 is a schematic plan view of an MR head of Example 1. FIG.

FIG. 2 is a cross-sectional view of the MR head of Example 1.

FIG. 3 is an enlarged perspective view of an essential part showing a state where an electronic cooling element is provided on a bias conductor.

FIG. 4 is a characteristic diagram showing a relationship between an estimated temperature due to heat generation of the MR element and a sense current.

FIG. 5 is a characteristic diagram showing an estimated life of an MR head with continuous energization.

FIG. 6 is a characteristic diagram showing the sense current dependency on the difference between heat generation and heat absorption when Sb and Bi are used as the electronic cooling element.

FIG. 7 is a characteristic diagram showing the sense current dependency on the difference between heat generation and heat absorption when Cu and constantan are used as the electronic cooling element.

FIG. 8 is a schematic plan view of an MR head of Example 2.

FIG. 9 is a cross-sectional view of an MR head of Example 3.

FIG. 10 is a sectional view of an MR head of Example 4.

FIG. 11 is a cross-sectional view of an MR head of Example 5.

FIG. 12 is a characteristic diagram showing the sense current dependency on the difference between heat generation and heat absorption in the MR heads of Example 3, Example 5, and Example 6.

FIG. 13 is a sectional view of an MR head of Example 7.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 slider 2 lower shield magnetic body 3 upper shield magnetic body 4 front electrode 5 rear electrode 6 MR element 7 bias conductor 8 ABS surface 12 electronic cooling element 12a first metal film 12b second metal film

Claims (13)

[Claims] 1. A magnetoresistive magnetic head having an electronic cooling element exhibiting a Peltier effect. 2. A magnetoresistive effect magnetic head in which an electric current is applied to a bias conductor to apply a bias magnetic field to the magnetoresistive effect element, wherein an electric circuit including the magnetoresistive effect element and electronic cooling exhibiting a Peltier effect are provided. A magnetoresistive effect magnetic head characterized in that bias conductors provided with elements are connected in series. 3. A magnetoresistive effect type magnetic head in which a bias magnetic field is applied to a magnetoresistive effect element by applying a current to a bias conductor, and an electric circuit including the magnetoresistive effect element and electronic cooling exhibiting a Peltier effect. A magnetoresistive effect magnetic head characterized in that bias conductors provided with elements are connected in parallel. 4. A magnetoresistive element which is arranged such that its longitudinal direction is perpendicular to the surface facing the magnetic recording medium, and one side edge of the front end faces the medium facing surface. A tip electrode laminated on the tip side of the magnetoresistive effect element, one edge of which is on the tip end side facing the medium facing surface; a rear end electrode laminated on the rear end side of the magnetoresistive effect element; A pair of shield magnetic bodies sandwiching the magnetoresistive effect element in which the electrode and the rear end electrode are laminated from the film thickness direction, and a bias conductor for applying a bias magnetic field generated by energization of current to the magnetoresistive effect element, A magnetoresistive effect magnetic head, characterized in that an electronic cooling element exhibiting a Peltier effect is used for the tip electrode. 5. A magnetoresistive effect element which is arranged such that its longitudinal direction is perpendicular to a surface facing a magnetic recording medium, and one side edge of the tip side faces the medium facing surface. A tip electrode laminated on the tip side of the magnetoresistive effect element, one edge of which is on the tip end side facing the medium facing surface; a rear end electrode laminated on the rear end side of the magnetoresistive effect element; A pair of shield magnetic bodies sandwiching the magnetoresistive effect element in which the electrode and the rear end electrode are laminated from the film thickness direction, and a bias conductor for applying a bias magnetic field generated by energization of current to the magnetoresistive effect element, A magnetoresistive effect type magnetic head characterized in that an electronic cooling element exhibiting a Peltier effect is used for the rear end electrode. 6. A magnetoresistive effect element which is arranged such that its longitudinal direction is perpendicular to a surface facing a magnetic recording medium, and one side edge of the tip side thereof faces the medium facing surface. A tip electrode laminated on the tip side of the magnetoresistive effect element, one edge of which is on the tip end side facing the medium facing surface; a rear end electrode laminated on the rear end side of the magnetoresistive effect element; A pair of shield magnetic bodies sandwiching the magnetoresistive effect element in which the electrode and the rear end electrode are laminated from the film thickness direction, and a bias conductor for applying a bias magnetic field generated by energization of current to the magnetoresistive effect element, A magnetoresistive effect type magnetic head, characterized in that an electronic cooling element exhibiting a Peltier effect is used for the front electrode and the rear electrode. 7. A magnetoresistive effect element, which is arranged such that its longitudinal direction is parallel to a surface facing a magnetic recording medium, and one side edge of the front end faces the medium facing surface. The magnetoresistive effect element is provided with a pair of electrodes laminated on both ends in the longitudinal direction of the magnetoresistive element and extending rearward from the medium facing surface in a direction perpendicular to the medium facing surface, and exhibits a Peltier effect on both electrodes. A magnetoresistive effect magnetic head using an electronic cooling element. 8. The magnetoresistive effect magnetic head according to claim 4, wherein an electric circuit including the magnetoresistive effect element and a bias conductor provided with an electronic cooling element exhibiting a Peltier effect are connected in series. 9. A magnetoresistive effect type magnetic head according to claim 5, wherein an electric circuit including the magnetoresistive effect element and a bias conductor provided with an electronic cooling element exhibiting a Peltier effect are connected in series. 10. An electric circuit including a magnetoresistive effect element,
7. A magnetoresistive effect type magnetic head according to claim 6, wherein bias conductors provided with an electronic cooling element exhibiting a Peltier effect are connected in series. 11. An electric circuit including a magnetoresistive effect element,
5. A magnetoresistive effect type magnetic head according to claim 4, wherein bias conductors provided with an electronic cooling element exhibiting a Peltier effect are connected in parallel. 12. An electric circuit including a magnetoresistive effect element,
6. A magnetoresistive effect type magnetic head according to claim 5, wherein bias conductors provided with an electronic cooling element exhibiting a Peltier effect are connected in parallel. 13. An electric circuit including a magnetoresistive effect element,
7. The magnetoresistive effect type magnetic head according to claim 6, wherein bias conductors provided with an electronic cooling element exhibiting a Peltier effect are connected in parallel.