JPH0224808A - Magnetic head and magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve the high-frequency recording and reproducing characteristics, wear resistance, sliding property, and durability of a magnetic head by forming the nonmagnetic supporting bodies of the head of sintered bodies composed principally of cubic ZrO2 and the joining glass of glass having a specific coefficient of thermal expansion. CONSTITUTION:A pair of magnetic head cores 37 and 38 constituted of amorphous magnetic alloy films 1 and 1' (33) formed on nonmagnetic supporting bodies 2 and 2' are butted against each other with a nonmagnetic gap material 39 in between and joined with glass 36 (3 and 3'). The supporting bodies 2 and 2' are made of sintered bodies composed principally of cubic ZrO2 having an average crystal grain diameter of <=3mum and the joining glass is composed of glass having a coefficient of thermal expansion within a range of 75-90X10<-7>/ deg.C. Moreover, the nonmagnetic supporting body of a magnetic head 50 is made of a ceramic sintered body having micro-Vickers hardness of 1,000-1,500 and an average crystal grain diameter of <=3mum.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a magnetic head suitable for use in combination with a tape (so-called metal tape) made of a metal magnetic material with high coercivity. In particular, the present invention relates to a magnetic head having excellent high-frequency recording/reproducing characteristics, abrasion resistance, sliding properties, durability, and mass productivity, and a magnetic recording/reproducing apparatus using the same.

[Conventional technology]

Currently, metal magnetic materials with a coercive force exceeding 10,000 e are being used as magnetic recording media in high-density magnetic recording and reproducing devices. Next to recording sufficient information on this magnetic recording medium, conventional ferrite magnetic heads lack the ability due to the low saturation magnetic flux density of ferrite. 5B-
Amorphous magnetic alloy films as described in 98824 publications
A ferrite composite magnetic head is used. This magnetic head has a structure in which a pair of magnetic head cores made of an amorphous magnetic alloy film formed on a ferrite magnetic support are joined with low temperature softened glass via a nonmagnetic gap material.

Since this amorphous magnetic alloy has a higher saturation magnetic flux density and higher magnetic constant than ferrite, a magnetic head using this alloy has significantly better recording and reproducing characteristics than conventional ferrite magnetic heads. As a material for an amorphous magnetic alloy film for a magnetic head, an amorphous alloy containing Cof as a main component is used. In addition, since it is necessary to bond the magnetic head core at a temperature at which the amorphous magnetic alloy does not crystallize, the working temperature of glass used in conventional ferrite magnetic heads is extremely low. Softened glass is used. However, this amorphous magnetic alloy film-7,000-layer composite magnetic head has the following problems in terms of performance.

(11 Generates large sliding noise in the high frequency range.

(2) Increasing the number of turns of the excitation coil increases the inductance, so it is not possible to increase the number of turns (3) The boundary between the amorphous magnetic alloy film and the ferrite may act as a pseudo gap. .

The above problem is caused by the use of ferrite in the magnetic head material, and can be solved by replacing the ferrite portion with a non-magnetic material. As this type of magnetic head, there is an amorphous magnetic alloy film-nonmagnetic material composite magnetic head as described in Japanese Patent Laid-Open No. 59-142716. Furthermore, in order to obtain suitable recording and reproducing characteristics in a high frequency range, this type of magnetic head is multilayered by alternately laminating amorphous magnetic alloy films and non-matrix insulating films.

The non-magnetic material that is the support for forming the amorphous fracture alloy film must have wear resistance against the metal tape, so it must have wear resistance equal to or higher than that of ferrite. Among ceramics, hard glass, etc., those with a thermal expansion coefficient close to that of an amorphous magnetic alloy are used. If this difference in thermal expansion coefficient is significant, problems such as peeling of the amorphous magnetic alloy film will occur.

[Problem to be solved by the invention]

The above-mentioned amorphous magnetic alloy film-nonmagnetic material composite magnetic head has better recording and reproducing characteristics in a wide band than the conventional ferrite magnetic head, and even better than the above-mentioned amorphous magnetic alloy film-ferrite composite magnetic head. It also has the feature of low sliding noise.

However, a non-magnetic support material and a bonding glass suitable for this magnetic head have not been found.

Currently, non-extractable 7-elite, A40B is used as a support.
, high temperature softened glass, etc., as bonding glass PBO '1
Although low-temperature softening glass as one component has been used, this combination often has problems in that the manufacturing yield of the magnetic head is poor and the reliability of the magnetic head is lacking. In the future, metal tapes will be used to improve the performance of recording and reproducing devices, and as they will run at extremely high speeds relative to magnetic heads, it will be necessary to significantly improve the reliability, or durability, of magnetic heads. Around. The non-magnetic material used in the above-mentioned amorphous magnetic alloy film-non-magnetic material composite magnetic head is designed with only wear resistance and coefficient of thermal expansion in mind;
It is also necessary to consider sliding properties with the metal tape.

For example, At, O, is too hard and will damage the metal tape, and high-temperature softened glass is brittle and has poor workability. Non-magnetic ferrite poses no problem when the metal tape runs at low speeds, but it has the problem of being easily worn when running at high speeds. Bonded glass contains Pb
Low-temperature softening glass with 0t as the main component is used,
Eight problems included high coefficient of thermal expansion, low strength and hardness, and poor water resistance.

The purpose of the present invention is to solve the above problems by using suitable non-magnetic materials and bonded glass, and to provide a complete magnetic head with excellent high-frequency recording and reproducing characteristics, wear resistance, sliding properties, durability, and mass productivity. be.

[Next means to solve the problem]

If we explain the present invention #1, the first invention of the present invention relates to a mountain head, in which a pair of magnetic head cores formed on a non-crystalline support and made of an amorphous magnetic alloy film are formed on a non-crystalline support. In the 8-magnetic heads which are butted against each other and joined by glass through a magnetic gap material, the non-magnetic support is made of a sintered body mainly composed of cubic Zr (ht) and has an average crystal grain size of S μm or less. , and the bonded glass has a coefficient of thermal expansion of 75 to
It is characterized by being made of glass within the range of 95 x 10-' / C.The second invention of the present invention is an invention relating to a mountain recording and reproducing device, in which a magnetic tape is transferred to a drum having a built-in rotating magnetic head. In a magnetic recording and reproducing device that records and reproduces signals by winding diagonally around the outer circumference of the magnetic tape to form a magnetic recording pattern having a predetermined inclination angle with respect to the longitudinal direction of the magnetic tape, the mountain head has a non-magnetic support. A pair of magnetic head cores made of an amorphous magnetic alloy film formed on the body are butted against each other with a non-magnetic gap material and bonded with glass, and the non-magnetic support has a micro-Vickers hardness of 1000 to 1000.
1500, is made of a ceramic sintered body with an average crystal grain size of 3 μm or less, and the bonded glass has a thermal expansion coefficient of 7
Characterized by being made of glass within the range of 5 to 95 x l O-1/C.

The above-mentioned sintered body used as a non-extractable support contains Y of 10 molti or less and Ca of 0.320 molti or less in terms of oxide.
A highly dense sintered body that can be easily obtained by containing at least one of O% Mgo and 8r0, CO0 of 50 molt or less and La1O1 of 55 molt or less, and further C (LOI ~ 1 wt.) is suitable.

The above-mentioned glass used as bonding glass contains 55 to 70 inches of V, Os, 17 of p, o, etc. in terms of oxides.
Low-temperature softening glass having essential components of ~25% and 5 to 20% of sb and os is most suitable. especially.

55-65% of V, Os, 18-22% of P2O1, and 5-12qb of sb, ol are preferred, and furthermore, 20 qb or less of pbo, 15% or less of Tt, 5% or less of Nb2O5, preferably, 5-10% of pbo, Too
3-10% of s Nb*Os.

As the amorphous magnetic alloy film, an amorphous alloy mainly composed of CO, which has high saturation magnetic flux density and high permeability, is suitable. It is preferable that the

The magnetic head of the present invention is suitably used as a tape contact type magnetic head that can sufficiently withstand tapes, particularly metal tapes.

The magnetic head according to the present invention has significantly improved wear resistance, sliding properties, durability, and mass productivity.

The above-mentioned sintered body for a nonmagnetic support has excellent workability, wear resistance, and slidability. This is the average grain size t-5μ
By making it less than m, the workability is good, and by making it a highly dense cubic crystal sintered body, the abrasion resistance and sliding property against the metal tape are improved. This sintered body is %
% as a stabilizer to make ZrO2 cubic at room temperature
Y2O3% CaO% Contains at least one of MgO, 5rO1CIO, and La1O1. If the amount of this stabilizer is small, the tetragonal crystal Zr0, which is difficult to process,
2 is mixed in, resulting in poor workability and sliding properties. However, if the amount of tetragonal Zr02 is small, this will not be much of a problem. Therefore, the proportion of cubic crystals is preferably 90 to tons, particularly preferably 100%. Further, in order to make the average crystal grain size of this sintered body 5 μm or less, this sintered body contains 101 to tO weight % of C as a grain growth inhibitor.

If the C content is less than 101 cm, there is no effect; 1.
If it exceeds 0.01%, the porosity increases and a highly densified sintered body cannot be obtained. Is the average grain size of the sintered body 3μ? P
If it exceeds I, the depping during processing will increase and the processing yield of the support will be significantly reduced.
100xlO-? /°C, which is smaller than that of an amorphous magnetic alloy mainly composed of Co, but an amorphous magnetic alloy film can be formed firmly by sputtering without peeling.
Moreover, the magnetic properties of this film are hardly deteriorated.

To prevent the occurrence of cracks in the low-temperature softened glass for bonding, use a glass with a thermal expansion coefficient of 75 to 95 x 10-77°C, which is slightly smaller than the thermal expansion coefficient of the sintered body for the non-extrusive support.
It's better. In this respect, the low-temperature softening glass according to the present invention has a smaller coefficient of thermal expansion than the conventionally used low-temperature softening glass containing pbo as a main component, and a glass that meets the requirements can be obtained. Furthermore, the low-temperature softening glass according to the present invention has higher strength and hardness than conventional low-temperature softening glasses, and has excellent workability and water resistance.

First, the magnetic head of the present invention uses a high saturation magnetic flux density and high permeability amorphous alloy film mainly composed of Cot as a core material, and further includes a nonmagnetic insulating film on this amorphous alloy film. By multi-layering the material, it exhibits suitable recording and reproducing characteristics in a wide band.

That is, a high saturation magnetic flux density and high magnetic permeability amorphous alloy film mainly composed of cot, and a highly densified sintered film mainly composed of cubic Zr0ze with an average crystal grain size of 57 Jtts or less for its non-extractable support. VjOI with a thermal expansion coefficient in the range of 75 to 95x1o-7/'c for bonding the body and magnetic head core.
By combining three materials: low-temperature softening glass, which is the main component of spros and sb, o, and 2, the sliding properties with metal tape and the abrasion resistance of the magnetic head are significantly better than conventional ones, resulting in a high performance magnetic head. It can be manufactured with low yield.

The magnetic head of the present invention uses an amorphous magnetic alloy for the core material and is particularly effective in the following cases, including Sendust, Permalloy,
A crystalline magnetic alloy such as Alperm may be used for the entire core material and bonded with glass having a corresponding coefficient of thermal expansion.

The device according to the invention is suitable for video tape recorders. This video tape recorder uses metal as the recording medium and is suitable for high-speed running.

The present invention will be explained in detail below.

FIG. 1 shows a perspective view of a typical magnetic head.

Reference numeral 1.1' is an amorphous magnetic alloy film, and in the example, Con-- which is an amorphous alloy with high saturation magnetic flux density and high permeability.
2.2' is a non-maternal support for forming this amorphous magnetic alloy film.
．． 3' is a low temperature softened glass used for joining the magnetic head core. 4.4' consists of a protective film for preventing the low temperature softened glass from corroding the amorphous magnetic alloy film and a wettability improving film 21i1 for sufficiently wetting the low temperature softened glass. Reference numeral 5 denotes a gap abutting portion, which forms an operating gap via a nonmagnetic insulating film. 6 is a coil winding window.

The amorphous magnetic alloy film preferably includes non-magnetic insulating films 20, 20, 21, 21' and 22.2 as shown in FIG.
FIG. 2 is a plan view of the sliding surface of the magnetic head shown in FIG. 1.

Next, a method for manufacturing the magnetic head shown in FIG. 1 will be described. 3 to 6 are explanatory diagrams of a series of steps in the method of manufacturing the magnetic head shown in FIG. 1. In each figure,
50 is a non-magnetic support substrate, 51 is a coil winding window groove, 32 is a track groove, 35 is an amorphous magnetic alloy film%54
35 is a protective film, 35 is a wettability improving film, 56 is low-temperature softened glass, 37 and 58 are magnetic head core blocks, and 59 is a nonmagnetic gap material.

As shown in FIG. 3, a substrate 3 used as a non-extractable support
A groove 51 for a coil winding window and a track groove 32t were provided in the groove 0 to form a gap abutting surface. Next, as shown in FIG. 4, Co11-Nbta-Z
rs sputtering on the amorphous alloy film 33, protective film 54, and wettability improvement film 35, and fill the track groove S2 with low temperature softened glass 56.
-Zrs The heat resistance temperature of the amorphous alloy is 480℃, so
Glass filling was performed at 460°C. This amorphous alloy film is not a single layer as mentioned earlier, but is preferably multilayered with a nonmagnetic insulating film interposed therebetween.

Next, as shown in FIG. 5, by removing unnecessary low-temperature softened glass and amorphous magnetic alloy film, grooves for the coil winding window and the required track width tt'' gap are formed on the abutting surfaces, - A pair of 8-air head core blocks 57.5B'i were prepared by cutting along the dotted chain line A.

In addition, from FIG. 5 onwards, the protective film 34 and the wettability improving film 55 are omitted. Place non-destructive gap material 39 on the gap abutting surfaces of both core blocks 57 and 58, respectively! amount sputtered and butted as shown in FIG. 6, 460
Bonding was carried out at ℃. Next, cut sequentially along the - dotted chain lines B and B,
A friend who made the magnetic head shown in Figure 1.

Representative examples that are suitable as the above-mentioned non-magnetic support are shown in Table 1, and representative examples that are not suitable are shown in Table 2. Furthermore, Table 3 shows the results of a preliminary study of the vulnerable support bodies shown in Tables 1 and 2.

Note that the crystal system of Zr01 and the proportion of its crystal phase were investigated by X-ray diffraction. The average crystal grain size is determined by gold-etching the polished surface of the support substrate, using the intercept method (code method) from the enlarged photo, and calculating the average crystal grain size of about 200 crystal grains on the polished surface, and then statistically calculating the average crystal grain size. Coefficient 1.5
It is the three-dimensional average crystal grain size obtained by multiplying by 6. The average chipping size is shown in FIG. 3 and is the average chipping size when the groove processing is performed. The processing yield was obtained when 100 supports were processed into the shape and size of the magnetic head, and cases where there were chips of 5 μm or more were judged as defective. The amount of wear was determined by processing the magnetic head into the shape and size, attaching it to the cylinder of the support t-V'I'H, and rolling the Meckle tape at a relative speed of 5.8 m/sec.
The wear amount of the support was measured for 00 hours. Slidability is determined by observing the tape running surface of the support used to measure the amount of wear, and determining whether stains from running the metal tape, that is, the magnetic recording medium or the organic binder used to attach it to the tape, are observed. evaluated. If no μ was observed, it was judged that the tape had good compatibility with the metal tape and had good sliding properties.

The thermal expansion coefficients of the supports A to J and the supports (K) to (Q) are relatively large, and the coam -Nb14-Zr3
Even when sputtering an amorphous alloy, it will not peel off.
The supports of oA- and T and the supports of (K) to (M) are Zr.
This is a sintered body whose main material is 01. The support of A-J is cubic ZrOs with an average crystal grain size of 5 μm or less? : The main material is a highly dense sintered body, which has excellent workability, wear resistance, and sliding properties. Particularly, support B is excellent.

On the other hand, the support of (K) has a large average crystal grain size, has large chipping during processing, and has poor workability.

The support (L) has a high porosity, that is, it is not highly dense, and the magnetic recording medium is caught in the pores.

Poor sliding properties. The support (M) also contains 25% by weight of tetragonal Zr01t, which is difficult to process, and therefore has poor processability.

The supports (N) to (Q) are not sintered bodies mainly made of Zr01. The supports (N) and (0) are too hard and will damage the metal tape. The supports (P) and (Q) are soft and have poor abrasion resistance. The support (Q) is a magnetic material used in conventional ferrite EB heads and amorphous magnetic alloy-ferrite composite magnetic heads, but is essentially not suitable for the present invention. processability,
Abrasion resistance and sliding properties? This is useful for comparison. Comparing this support with the A-J support, the AS-J support has a micro-Vickers hardness of 1000 to 1500, has extremely excellent wear resistance, and contributes to extending the life of the magnetic head.

Table 4 shows the composition and characteristics of typical bonding glasses. Bonding glasses 0a to 0e are low temperature softening glasses with v2o, tl- as the main components, and bonding glass (f) is a conventional PB glass.
These are common low-temperature softening glasses containing o'l as the main component. These bonding glasses used for comparison have low characteristic points measured by DTA, and glass filling and glass bonding are possible at 546 rJ°C. The bonded glasses a to e have a smaller thermal expansion coefficient than the bonded glass (f), and can be adjusted to the thermal expansion coefficient of the support shown in Table 1 as shown above. Generally, it is preferable that the coefficient of thermal expansion of the bonded glass is smaller than that of the support. In particular, when the bonded glass has a larger coefficient of thermal expansion than the support, such as the bonded glass shown in (f), tensile stress is applied to the glass, making it easy to break, resulting in a poor manufacturing yield of magnetic heads. In addition, aM+ 9 bonded glass has a four-point bending strength of 4.5 to 9 f/m or more and a hardness of 500 or more.
It has higher strength and hardness than f) bonded glass. The chip strength of a magnetic head largely depends on the strength of the bonded glass. Generally, glass has no grain boundaries and has good sliding properties, and the wear resistance of glass largely depends on its hardness. Next, the bonded glasses a to e can enhance or improve the durability of the magnetic head. Water resistance was determined by placing a glass piece cut into a 5 x 5 x 5 cube in 40 cubes of distilled water.
Overlapping area per unit overlapping lid when heated at 70℃ for 2 hours (
■／j), and the bonded glass of a to e is less than 1■,
It has significantly better water resistance than the bonded glass (f), and can completely improve or improve the reliability of the magnetic head.

〔Example〕

The present invention will be explained in more detail below using Examples 1+1J, but the present invention is not limited to these Examples.

The magnetic head shown in FIG. 1 was manufactured using the support shown in Table 1 or 2 and the bonded glass shown in Table 4, and evaluated.

Implementation f! I l The magnetic head shown in FIG. 1 was manufactured using the combinations of supports and bonding glasses shown in Table 5. Note that the evaluation of the obtained magnetic head is also shown in Table 5. Here, the head manufacturing yield is the processing yield when manufacturing the mountain head. The average head chip strength is obtained by measuring the load under which all the head chips are broken. The amount of wear was determined by attaching the metal tape to the cylinder of the obtained magnetic head t-VTR at a relative speed of 5.8 m/sec.
After running for 500 hours, the amount of wear on the Yamaki head was measured.

In the combination of support B and bonded glass (f), the head manufacturing yield and average head chip strength are extremely low. This is because the coefficient of thermal expansion of the bonded glass (f) is much larger than that of the support B, and cracks are likely to occur in the bonded glass (f).

In the combinations of support (P) and bonded glass (f) and support (Q) and bonded glass (f), the average head chip strength is low and the % wear loss is extremely large. This is bonded glass (
This is because the strength of f) is low and the amount of wear of the supports (P) and (Q) is large. Using a bonded glass (Li) with higher strength and hardness than the bonded glass (f), the support (
When combined with Q), head manufacturing yield, average head chip strength and wear resistance are significantly improved.

In contrast to the above comparative example, in the example, support B and bonding glass a
By combining each of the Seks, the head manufacturing yield, average hard tip strength, and abrasion resistance are extremely excellent.

Among them, especially in combination with bonded glass e, excellent results can be obtained.

Furthermore, good results were obtained in the sliding properties of the magnetic head produced using the combinations shown in Table 5 because the supports Bs(p) and (Q) having good sliding properties were used. However, bonded glass (f
), the amount of wear on this glass is significant;
There is a large dent in the bonded glass part.

Regarding performance, regardless of the bonded glass, non-magnetic support B
%(P)t- exhibited good recording and reproducing characteristics in a wide band, but when a magnetic support (Q) was used, sliding noise was generated in a high frequency region.

As described above, the magnetic heads of the examples shown in Table 5 satisfy all of these characteristics in terms of high frequency recording and reproducing characteristics, wear resistance, sliding properties, durability, and mass productivity.

Example 2 Supports shown in Table 1 and C to J, bonded glass et
- The magnetic head shown in FIG. 1 was produced by combining the above. All evaluation results are shown in Table 6. Note that the evaluation method is the same as in Example 1.

Table 6 The obtained fc9fl class magnetic heads have a high head production yield and average head chip strength, have a small amount of wear, and have excellent wear resistance. After using it, good sliding results can be obtained. As for performance, there were no problems. Figure 7 is a perspective view of the rotating part of the magnetic recording/reproducing apparatus.

That is, a rotating magnetic head device 41 used in a video tape recorder has a rotating disk 42 that rotates in the direction of the arrow as shown in FIG. The upper and lower drums 45 and 44 are fixed to the chassis, etc. of the machine.

The motor 45 rotates the rotating disk 42 . The magnetic tape 46 is attached to these upper and lower drums 45 and 44.
It is wrapped diagonally around an angle range of about 1600 degrees,
The vehicle is operated to travel in the direction of arrow B.

In order to maintain a constant position of the magnetic tape 46 with respect to the rotary head device 41, guide balls 47, 48, a stepped portion 49 of the lower drum 440, etc. are provided.

Nine, for example, two magnetic heads 50 are provided,
These are mounted on the rotating disk 42 at an angle of 180° to each other. The light leakage of the head chip of the magnetic head 50 slightly protrudes from the outer peripheral surfaces of the upper and lower drums 45, 44, etc., and comes into sliding contact with the magnetic tape 46, thereby recording and reproducing video signals.

Due to the magnetic head rotating in this way, the magnetic tape 46
On the top, recording tracks T are sequentially formed diagonally as shown in FIG. These recording tracks are formed when the magnetic tape 46 is driven to run at a steady speed vo in the direction of arrow B, during normal playback.

The head chip 11 is straight 1. Normal video signal reproduction is achieved by moving the top of the screen.

In such a magnetic recording/reproducing device, the magnetic head 50
The structure shown in Figure 1 explodes as follows. Compositions No. and A in Table 1 were used for the magnetic head support, and No. and a in Table 4 were used as the aforementioned CO-based alloy amorphous magnetic film and bonding glass.
I used the one from This magnetic head was attached to the VTR cylinder, and the metal tube was moved at a relative speed of 5.8 m1sec.
As a result of running for 00 hours, the wear resistance was less than 5 μm, the sliding property was good and smooth, and the average size of chips was less than 5 μm.

〔Effect of the invention〕

According to the present invention, a magnetic head core made of an amorphous alloy film with a high saturation magnetic flux density and high permeability that can sufficiently record and reproduce information on a recording medium having a high coercive force, and this amorphous alloy are formed. The non-magnetic support is a highly densified sintered body mainly composed of cubic Zr0g1 with an average grain size of 5 μm or less, and the bonding glass of the magnetic head core has a coefficient of thermal expansion of 75 to 95xlO''.
By using a combination of low-temperature softening glasses in the range of ``?/C, high-frequency recording and reproducing characteristics, abrasion resistance, sliding properties,
We can provide highly reliable and high-performance Yamaki heads with excellent durability and mass production.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a magnetic head in an embodiment of the present invention, FIG. 2 is a plan view of the sliding surface of the magnetic head in FIG. 1, and FIG.
6 to 6 are explanatory diagrams of each step in the method for manufacturing the magnetic head shown in FIG. 1, FIG. 7 is a perspective view of the rotating part of the magnetic recording and reproducing device, and FIG. 8 is a plane showing recording tracks on the magnetic tape. It is a diagram. 1, l', 55: amorphous fjK fractured alloy film, 2,2
: Non-magnetic support, S, 5', 36: Low temperature softened glass, 6
: Coil winding window% 20, 20, 21, 21.22%2
2: Nonmagnetic insulator film, 30: Nonmagnetic support substrate, 51
: Coil winding window groove, 52:) Rank groove, 4.4.5
4: protective film, 55: wettability improving film, 57.58: a-head core block, 59: non-magnetic cup material, 41: rotating magnetic head device, 42: rotating disk, 45: upper drum, 44: lower drum , 45: Motor, 46: Magnetic tape%
47.48 Ni guide ball, 49: Step part of lower drum,
50: Magnetic head, 11: Head chip Hata / Figure Patent applicant: Hitachi, Ltd.

Claims (1)

[Claims] 1. A magnetic head in which a pair of magnetic head cores made of an amorphous magnetic alloy film formed on a non-magnetic support are butted against each other with a non-magnetic gap material and joined with glass, The non-magnetic support is made of a sintered body mainly composed of cubic ZrO_2 and has an average grain size of 3 μm or less, and the bonded glass has a thermal expansion coefficient of 75 to 95×10^-^7/
A magnetic head characterized in that it is made of glass within a temperature range of °C. 2. The sintered body is from the group consisting of 10 mol% or less of Y_2O_3, 20 mol% or less of CaO, MgO and SrO, 30 mol% or less of CeO_2, and 35 mol% or less of La_2O_3, respectively, in terms of oxides. Claim 1 containing at least one metal corresponding to the selected oxide.
The magnetic head described. 3. The magnetic head according to claim 1 or 2, wherein the sintered body contains 0.01 to 1.0% by weight of C. 4. The bonded glass has a weight of V_ in terms of oxide, respectively.
55-70% of 2O_5, 17-25% of P_2O_5
The magnetic head according to any one of claims 1 to 3, wherein the magnetic head is a glass containing 3 to 20% of Sb_2O_3 as essential components. 5. The magnetic head according to claim 1, wherein the amorphous magnetic alloy film is an amorphous alloy film containing Co as a main component. 6. The magnetic head according to claim 1, wherein the amorphous magnetic alloy film is multilayered with a nonmagnetic insulating film interposed therebetween. 7. The magnetic head according to any one of claims 1 to 6, wherein the magnetic head is a tape contact type magnetic head used for a tape whose magnetic recording medium is a metal magnetic material with high coercive force. 8. A magnetic head in which a pair of magnetic head cores made of an amorphous magnetic alloy film formed on a non-magnetic support are butted against each other with a non-magnetic gap material and joined with glass, in which the non-magnetic support is Micro Vickers hardness is 1
000 to 1500 and is made of a ceramic sintered body with an average crystal grain size of 3 μm or less, and the bonded glass has a thermal expansion coefficient of 7
A magnetic head characterized in that it is made of glass having a temperature within the range of 5 to 95 x 10^-^7/°C. 9. Magnetic recording that records and reproduces signals by winding a magnetic tape diagonally around the outer circumference of a drum containing a rotating magnetic head to form a magnetic recording pattern having a predetermined inclination angle with respect to the longitudinal direction of the magnetic tape. In the reproducing device, the magnetic head includes a pair of magnetic head cores made of an amorphous magnetic alloy film formed on a non-magnetic support, which are butted against each other with a non-magnetic gap material and bonded with glass. is made of a ceramic sintered body with a micro-Vickers hardness of 1000 to 1500 and an average crystal grain size of 3 μm or less, and the bonded glass has a thermal expansion coefficient of 75 to 95 × 1
A magnetic recording/reproducing device characterized in that it is made of glass with a temperature within the range of 0^-^7/°C. 10. Magnetic recording that records and reproduces signals by winding a magnetic tape diagonally around the outer circumference of a drum containing a rotating magnetic head to form a magnetic recording pattern having a predetermined inclination angle with respect to the longitudinal direction of the magnetic tape. In the reproducing device, the magnetic head includes a pair of magnetic head cores made of an amorphous magnetic alloy film formed on a non-magnetic support, which are butted against each other through a non-magnetic gap material and bonded with glass. However, most of the main components are cubic ZrO_2, and Y
_2O_3, CaO, MgO, SrO, CeO_2, L
Average crystal grain size 3μ containing at least one kind of a_2O_3
A magnetic recording/reproducing device comprising a ceramic sintered body having a size of 1.0 m or less, and the bonded glass comprising an oxide containing vanadium as a main component in terms of V_2O_5 and phosphorus and antimony in terms of P_2O_5 and Sb_2O_3. Device. 11. The sintered body has a molar ratio of 55 in terms of ZrO_2.
~70% zirconium, converted to Y_2O_3 1
At least one of the following: 0% or less of yttrium, 20% or less of each of calcium, magnesium, and strontium in terms of CaO, MgO, and SrO, 30% or less of cerium in terms of CeO_2, and 35% or less of lanthanum in terms of La_2O_3. 11. The magnetic recording and reproducing device according to claim 10, comprising seeds.