JPH0522285B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a floating magnetic head that performs magnetic recording and reproduction in a minute floating state relative to the surface of a recording medium, and particularly relates to a floating magnetic head having a monolithic type composite core. Related to floating magnetic heads.

(Prior art and its problems) Conventionally, a magnetic head for a hard disk drive that performs magnetic recording and reproduction on a so-called hard disk, which has a hard recording medium surface, uses air to levitate the hard disk at a small distance. Bearing Surf S (hereinafter referred to as ABS surface)
A floating magnetic head is used, which consists of a slider section having a magnetic head and a magnetic head section that performs magnetic recording and reproduction.

Recently, in magnetic recording and reproducing devices using hard disks, magnetic metals with high coercive force are used as recording media to increase the recording density. The circuit uses a ferrite magnetic material with excellent frequency characteristics, and a so-called composite core is formed with a ferromagnetic metal film made of, for example, Sendust (registered trademark), which has a high saturation magnetic flux density near the magnetic gap where the magnetic flux is most concentrated. Various types of floating magnetic heads have been devised and put into practical use. In general, levitated magnetic heads are a composite type in which an independent magnetic head part is buried in a part of the slider part, and a winding groove is formed on the abutting surface, and the wire is wound in this winding groove. They are roughly divided into two types: the monolithic type, in which the magnetic core halves are integrally joined to the slider section via a gap material made of non-magnetic material;
Examples of conventional floating magnetic heads having composite cores for these two types will be described below.

FIG. 13 is a perspective view showing the entire floating magnetic head 10 having a conventional composite type composite core, and FIGS. 14 and 15 show the first and second floating magnetic heads of the floating magnetic head shown in FIG. FIG. 3 is a plan view showing the vicinity of the magnetic gap of the magnetic head portion in the conventional example.

In FIG. 13, 11 is a slider section, and 12 is a magnetic head section. The slider section 11 is made of a non-magnetic material such as ceramic, and has a pair of coplanar surfaces.
Equipped with ABS surfaces 11a and 11b, these pair
An inclined surface 11c for introducing air is formed at one end of the ABS surfaces 11a and 11b, and the magnetic head section 12 is connected to the magnetic gap at the air outflow end corresponding to the other end of at least one ABS surface, for example, 11a. 12a and the ABS surfaces 11a and 11b are buried in the same plane. In the first conventional example shown in FIG.
A ferromagnetic metal film 16 such as Sendust is formed flat on the abutting surfaces 14a and 15a of the magnetic core halves 14 and 15, and this flat surface is used as the formation surface of the magnetic gap 13. be. Therefore, in this case, the joining surfaces of the ferromagnetic metal film 16 and the magnetic core halves are equal to the abutting surfaces 14a and 15a, and are parallel to the magnetic gap. It is well known that the bonding surface between a ferrite magnetic material and a ferromagnetic metal film generally acts as a pseudo-gap, causing noise due to interference in the reproduced waveform. It is also well known that the effect becomes stronger when the two planes are parallel to each other.

For example, in digital recording/reproduction that handles pulses, as shown in FIG. 16, the effect is that an abnormal peak portion 18 occurs in the isolated reproduced wave 17 due to the pulse, causing a malfunction of the device. The dot was hot.

Therefore, as shown in FIG.
There is a structure in which the a and 15b are inclined with respect to the magnetic gap 13. However, in this magnetic head section 12, V-shaped grooves are formed on both ends of the magnetic gap 13 in order to regulate the width of the magnetic gap 13, and the molded glass is placed in this groove.
9, this V-shaped groove tends to pick up signals from adjacent tracks (not shown), which deteriorates crosstalk characteristics. FIG. 17 is a perspective view showing the entire floating magnetic head 20 having a conventional monolithic type composite core, and FIG. 18 is an enlarged plan view showing the vicinity of the magnetic gap of the floating magnetic head shown in FIG. 17. be.

In FIG. 17, 21 is a slider part made of ferrite magnetic material, 22 is a magnetic core half made of ferrite magnetic material joined to the end face 21a of the slider part 21, and a winding groove 22a is provided on the abutting surface side.
A ferromagnetic metal film 23 made of sendust or the like is formed on the abutting surface side including the winding groove 22a. Two parallel tapered air inflow grooves 25 are formed on the ABS surface 24 of the slider portion 21, and the end surface 27 of the center rail 26 formed between these grooves 25 is made of a non-magnetic material. The magnetic core halves 22 are joined together via a magnetic gap material to form a magnetic gap 28 corresponding to the track width on the same plane as the ABS surface 24. In the above configuration, since the joint surface 22b between the ferromagnetic metal film 23 and the magnetic core half is parallel to the magnetic gap 28, for the same reason as above, the isolated reproduced waveform 17 is There was a problem in that an abnormal peak portion 18 occurred as shown in FIG.

(Means for Solving the Problems) The present invention has been made to solve the above problems, and includes an end surface of a slider portion that has a floating air bearing surface on the surface and is made of a ferrite magnetic material; A levitation device having a winding groove on the abutting surface and integrally joining the abutting surface of a magnetic core half made of a ferrite magnetic material through a non-magnetic film to form a magnetic gap in the air bearing surface. In the type magnetic head, a bonding surface for bonding a ferromagnetic metal film to a part of the end face and a part of the abutting surface is formed to be inclined with respect to the magnetic gap, and a bonding surface between the ferromagnetic metal films is formed to be inclined with respect to the magnetic gap. The present invention provides a floating type magnetic head characterized in that the width of the magnetic gap formed in the air bearing surface is regulated by the distance between two substantially parallel grooves formed in the air bearing surface.

(Example) FIG. 1 is a perspective view of a floating magnetic head 30 according to the present invention, and FIG. 2 is a partial view showing the vicinity of the magnetic gap, which is the essential part of the invention of the floating magnetic head shown in FIG. It is an enlarged view. The floating magnetic head 30 of the present invention is structurally of the monolithic type shown in FIGS. 17 and 18, and has a composite core made of a ferrite magnetic material and a ferromagnetic metal film. 17th
In the figure and FIG. 18, 31 is a slider portion made of ferrite magnetic material, and 32 is a magnetic core half made of ferrite magnetic material. A winding groove 33 is formed in the abutting surface 32a of the magnetic core half 32, and a first ferromagnetic metal is formed on a part of the abutting surface 32a in front of the winding groove 33, which is inclined with respect to the magnetic gap 34. A first bonding surface 36 for bonding the film 35 is formed, and the surface of the first ferromagnetic metal film 35 formed on this first bonding surface 36 forms the formation surface of one magnetic gap 34. ing. 37 is a coil wound using the winding groove 33.

The slider portion 31 has an ABS surface 38, and a second ferromagnetic metal film 40 tilted with respect to the magnetic gap 34 is bonded to the end surface 39 near the ABS surface 38 at a substantially central portion thereof. 2 joint surface 4
1 is formed, and the second ferromagnetic metal film 40 formed on this second bonding surface 41 forms the surface on which the other magnetic gap 34 is formed. The magnetic core half 32 includes first and second ferromagnetic metal films 35 and 40.
They are integrally joined with a gap material made of non-magnetic material in between, forming a magnetic gap 34 coplanar with the ABS surface 38, and this magnetic gap 3
4 is regulated by the width t of the center rail 38a formed by two substantially parallel tapered grooves 42 formed in the ABS surface 38, and forms a substantial track width. . More specifically, the tapered groove 42 has a vertical portion 42a and an inclined portion 42b.
The track width is regulated by the inclined portion 42b. 43 is molded glass,
A portion of the winding groove 33 is filled by melting.
44 is adhesive glass, which is filled into a bonding groove 45a formed in the abutting surface 32a of the magnetic core half body 32 to bond the magnetic core half body 32 and the slider portion 31 together. Reference numerals 46 and 47 are tapered portions for air inflow and outflow, which are formed at the ends of the slider magnetic core half body 32, respectively. Reference numeral 48 denotes a mounting groove, which is used to attach to a mounting tool (not shown).

As mentioned above, in the floating magnetic head 30 of the present invention, the first and second bonding surfaces 36 and 41 are
Since the ABS surface 38 is configured to be inclined with respect to the magnetic gap 34, a false gap does not occur.
In addition, since the ends of the magnetic gap 34 are regulated by two substantially parallel tapered grooves 42, the ends of the magnetic gap 34 have V-shaped grooves, Alternatively, no right-angled grooves are generated due to core misalignment, and therefore no crosstalk occurs due to signals from adjacent tracks.

Next, a method of manufacturing the magnetic head 30 according to the present invention will be explained.

3 to 11 are schematic explanatory diagrams showing the manufacturing process of the floating type magnetic head according to the present invention shown in FIGS. 1 and 2, and will be explained below with reference to each figure.

As shown in FIG. 3, a block-shaped magnetic core half 32 made of ferrite magnetic material is prepared, and a plurality of V-shaped first joining surfaces 36 are arranged at a predetermined interval on the end of this abutting surface 32a. and form it.

Next, as shown in FIG. 4, a block-shaped slider 31 made of ferrite magnetic material is prepared, and a plurality of second bonding surfaces 41 made of V-shaped grooves are formed on the end face 39 of the slider 31, as described above.

Next, as shown in FIG. 5, a first
After forming the second ferromagnetic metal films 35 and 40 by thin film forming means such as sputtering,
These V-shaped grooves are filled with mode glass 43 by melting.

Next, as shown in FIG. 6, the winding groove 33 is formed on the abutting surface 32a of the magnetic core half 32 so as to communicate with the first joint surface 36, and the corner for the joint groove 45 is cut. After that, after polishing the abutting surface 32a and the end surface 39 of the ABS surface 38 to a mirror surface, for example,
A non-magnetic thin film (not shown) made of SiO ₂ or the like is formed on the abutting surface 32a, and as shown in FIG. By melting and filling the adhesive glass 44 into the slider 3
1 and the magnetic core half body 31 are joined together. At this time, the first and second ferromagnetic metal films 35 and 40 are bonded so as to face each other in a zigzag pattern. (See Fig. 12) Next, as shown in Fig. 8, the slider 31 is
After forming a mounting groove 48 on the back side of the ABS surface 38, a pair of parallel grooves 42a are formed on the ABS surface 38 between the ferromagnetic metal films 35 and 40 and approximately perpendicular to the magnetic gap 34. As a result, the center rail 38a is obtained and the magnetic heads are separated into individual magnetic heads 50 along the cutting grooves 49. Next, as shown in FIG. 10, tapered portions 46 and 47 for air inflow and outflow are formed on the ABS surface 38.

Next, as shown in FIG. 11, the center rail 3
8a, a part of the magnetic core half 32 excluding the center rail 38a is removed by cutting, and the winding 37 is wound in the winding groove 33, thereby forming the structure shown in FIGS. 1 and 2. A floating magnetic head 30 as shown can be obtained. FIG. 12 is a plane showing the vicinity of the magnetic gap, and in the figure, the shaded area shows the removed portion of the magnetic core half 32.

(Effects of the Invention) As described above, according to the floating magnetic head of the present invention, a ferromagnetic metal film is formed on a part of the end face of the slider made of ferromagnetic ferrite material and a part of the abutting face of the magnetic core halves. Since the bonding surfaces for bonding are formed to be inclined with respect to the magnetic gap, these bonding surfaces do not act as a pseudo gap during use, and the width of the magnetic gap formed between the ferromagnetic metal films is Since the distance between the two approximately parallel grooves formed in the air bearing surface is regulated, there is no V-shaped groove or right-angled groove caused by core misalignment on the end face of the magnetic gap. There is no deterioration of crosstalk caused by signals from adjacent tracks, and a floating magnetic head having excellent characteristics peculiar to a composite core can be produced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the floating magnetic head according to the present invention, FIG. 2 is a partially enlarged view showing the vicinity of the magnetic gap, which is the main part of the floating magnetic head shown in FIG. 1, and FIG. 11 are schematic explanatory diagrams showing the manufacturing process of the floating magnetic head according to the present invention shown in FIGS. 1 and 2, FIG. 12 is a plan view showing the vicinity of the magnetic gap, and FIG. 13 is a conventional A perspective view showing the entire floating magnetic head having a composite type composite core, FIGS. 14 and 15 show the magnetism of the magnetic head portion in the first and second conventional examples of the floating magnetic head shown in FIG. 13. A plan view showing the vicinity of the gap, FIG. 16 is an explanatory diagram for explaining the state in which an abnormal peak occurs in the isolated reproduced waveform, and FIG. 17 shows the entire floating type magnetic head having a conventional monolithic type composite core. Perspective view, Figure 18 is the first
FIG. 8 is an enlarged plan view showing the vicinity of the magnetic gap of the floating magnetic head shown in FIG. 7; 30...Floating magnetic head of the present invention, 31...
Slider, 32...Magnetic core half, 32a...Abutment surface, 33...Winding groove, 34...Magnetic gap, 35, 40...Ferromagnetic metal film, 36, 41...
...joint surface, 37...coil, 38...air bearing surf S, 39...end face of slider, 42
...Tapered groove.

Claims (1)

[Claims] 1. The end face of the slider part, which has an air bearing surface for floating on the surface and is made of a ferrite magnetic material, and the abutting surface of the magnetic core half, which has a winding groove on the abutting surface and is made of a ferrite magnetic material, is For bonding a ferromagnetic metal film to a part of the end surface and a part of the abutting surface in a floating magnetic head formed by joining together through a magnetic film to form a magnetic gap in the air bearing surface. The joint surface of the magnetic gap is formed to be inclined with respect to the magnetic gap, and the width of the magnetic gap formed between the ferromagnetic metal films is set to the distance between two substantially parallel grooves formed in the air bearing surface. A floating magnetic head characterized in that it is regulated according to the following regulations.