JPH07254139A - Magnetic recording medium and transfer method - Google Patents

Abstract

PURPOSE:To make mass production of software having high reproduced output from a low to high frequency range at a low cost by forming ferromagnetic metallic films as films diagonally grown with columns in magnetic films. CONSTITUTION:Copying is executed by superposing a mother tape M and a blank tape B in such a manner that the growth direction 22M of the columns in the ferromagnetic metallic film 21M of the mother tape and the growth direction 223 of the columns in the ferromagnetic metallic film 213 of the blank tape intersect with each other and that the ferromagnetic metallic films 21M and 21B come into contact with each other. The mother tape M and the blank tape B are mounted and a bias magnetic field is impressed thereto from the base side of the mother tape M by a ring type magnetic head 23, by which the recording information signals of the mother tape M are transferred to the blank tape B. The high-speed copying is made possible as the copying is transfer if the copying of the information is executed in such a manner. Since the bias magnetic field acts effectively, the transfer is efficiently executed from the low to the high frequency range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer technique used for recording an information signal of a mother tape on a blank tape.

[0002]

BACKGROUND OF THE INVENTION Conventionally, an information signal of a first magnetic recording medium (also called a mother tape or a master tape) is recorded at a high speed on a second magnetic recording medium (also called a blank tape or a slave tape). A magnetic transfer technique has been proposed as a means for achieving this. For example, Japanese Patent Laid-Open No. 4-16
As disclosed in Japanese Patent No. 3722, an external bias magnetic field is applied to a mother tape of a metal vapor deposition thin film type mother tape and a metal vapor deposition thin film type blank tape in such a manner that their columns are tilted in opposite directions. In the magnetic transfer method of transferring the recording magnetization of No. 1 to the blank tape, the external bias magnetic field is 110 ° ± from the in-plane direction of the mother tape for which the easy axis of magnetization is selected to be 20 ° ± 15 ° from the in-plane direction. A magnetic transfer method has been proposed which is characterized by applying in the direction of 15 °.

According to such a magnetic transfer system, the magnetic transfer efficiency is improved, demagnetization is small, and
It is said that the mother tape does not require a large coercive force and a good transfer output can be obtained. In addition, JP-A-3
In a magnetic transfer in which an information signal of a mother tape is transferred to a blank tape by superposing a mother tape and a blank tape on each other, applying pressure to a transfer drum and applying a bias magnetic field, A technique has been proposed in which the transfer drum is made of a high magnetic permeability material and the mother tape is made of a Fe—Co based vapor deposition tape.

According to such a magnetic transfer method, it is said that a good transfer output can be obtained.

[0005]

DISCLOSURE OF THE INVENTION It is an object of the present invention to provide a transfer technique capable of obtaining a sufficient output from a low range to a high range. An object of the present invention is a magnetic recording medium in which a soft magnetic film is provided on a non-magnetic support, and a ferromagnetic metal film is provided thereon, wherein the ferromagnetic metal film is This is achieved by a magnetic recording medium characterized in that the columns are grown obliquely.

A recorded magnetic recording medium used for transferring a predetermined information signal to another magnetic recording medium,
In this magnetic recording medium, a soft magnetic film is provided on a non-magnetic support, and a ferromagnetic metal film is provided thereon. The ferromagnetic metal film has a column inclination θ ₁ of 2 in the magnetic film.
It is achieved by a magnetic recording medium characterized by being 0 to 80 °.

A magnetic recording medium used when an information signal of a recorded magnetic recording medium is transferred, wherein the magnetic recording medium is provided with a soft magnetic film on a non-magnetic support.
A ferromagnetic metal film is provided thereon, and the ferromagnetic metal film has a column inclination θ ₂ of 5 to 6 in the magnetic film.
It is achieved by a magnetic recording medium characterized by being 0 °.

A method of transferring an information signal recorded on a first magnetic recording medium to a second magnetic recording medium, wherein the first magnetic recording medium is soft magnetic on a non-magnetic support. A film is provided, a ferromagnetic metal film is provided on the film, and columns in the ferromagnetic metal film are grown obliquely. The second magnetic recording medium is a soft magnetic film on a non-magnetic support. Is provided, and a ferromagnetic metal film is provided thereon.
The columns in the ferromagnetic metal film are grown obliquely, and the column growth direction in the ferromagnetic metal film of the first magnetic recording medium and the column growth direction in the ferromagnetic metal film of the second magnetic recording medium. And a magnetic field is applied so that the ferromagnetic metal films are located inside each other, and a bias magnetic field is applied.

The first magnetic recording medium and the second magnetic recording medium have a column inclination (θ ₁ ) of the ferromagnetic metal film of the first magnetic recording medium ≧ the strength of the second magnetic recording medium. It is preferable that the magnetic metal films are combined so as to satisfy the relationship of the column inclination (θ ₂ ). That is, when such a relationship was satisfied, the characteristics of demagnetization and transfer output were further improved.

In the ferromagnetic metal film of the first magnetic recording medium,
Column tilt (θ₁) Is 20 to 80 °,
Of the column in the ferromagnetic metal film of the second magnetic recording medium
(Θ ₂) Is preferably 5 to 60 °. Sanawa
If such a relationship is satisfied, the demagnetization and transfer output characteristics
The nature was further improved. And, in particular, θ₁−
θ₂Is 0 to 75 °, preferably 10 to 30 °
Moreover, the characteristics of demagnetization and transfer output are further improved.

The thickness of the soft magnetic film in these magnetic recording media is preferably 100-5000Å.
Further, at the time of transfer, it is preferable to apply a bias magnetic field vertically from the side of the first magnetic recording medium by a ring type magnetic head. Hereinafter, the present invention will be described in more detail.

The support used in the magnetic recording medium (the first magnetic recording medium and the second magnetic recording medium) of the present invention is non-magnetic, and such a support may be polyester such as PET, polyamide, Polyimide, polysulfone,
Olefin resins such as polycarbonate and polypropylene, cellulose resins, organic materials such as vinyl chloride resins, ceramics such as glass, and other metal materials such as aluminum alloys are used. An undercoat layer for improving the adhesion of the magnetic layer (magnetic thin film) is provided on the surface of the support. That is, by appropriately roughening the surface roughness, for example, the adhesion of the magnetic thin film formed by the oblique deposition method is improved, and the surface roughness of the metal magnetic thin film surface is moderated to improve the running property. Therefore, the undercoat layer is formed by providing a coating film containing particles such as SiO ₂ and having a thickness of 0.005 to 0.5 μm.

A soft magnetic film is provided on one surface of such a support by dry plating means such as sputtering means. The material used to form the soft magnetic film is
For example, Fe-Ni alloy, Fe-Si alloy, Fe-A
l-based alloy, Ni-Nb-Fe-based alloy, Fe-Si-Al
System alloys and the like. The soft magnetic film made of such a material is for enhancing the effectiveness of the bias magnetic field at the time of transfer, so that it is preferably about 100 to 5000 Å. That is, the soft magnetic film is 100
If it is thinner than Å, the feature due to the provision of the soft magnetic film is small. On the contrary, if it is thicker than 5000 Å, it is separated from the bias magnetic field head for transfer, and the attenuation of the bias magnetic field increases. is there. Further, the degree of improvement of the effect is not high, which is not preferable in terms of productivity and cost.

A ferromagnetic metal thin film is provided on the soft magnetic film by, for example, oblique vapor deposition means. Examples of the material of the magnetic particles forming the ferromagnetic metal thin film include Fe and C
In addition to metals such as o and Ni, Co-Ni alloys, Co-Pt
Alloy, Co-Ni-Pt alloy, Fe-Co alloy, Fe-
A Ni alloy, an Fe-Co-Ni alloy, an Fe-Co-B alloy, a Co-Ni-Fe-B alloy, a Co-Cr alloy, or those containing a metal such as Al is used. Also, Fe-N alloy, Fe-N-O alloy, Fe-C
Alloys, Fe-C-O alloys, etc. are also used. Incidentally, it is preferable that an oxidizing gas is supplied when the metal magnetic thin film is formed, and a protective layer made of an oxide film is formed on the surface layer of the metal magnetic thin film. Further, it is more preferable that diamond-like carbon, boron carbide, silicon nitride, or the like is further provided as the protective layer. Further, it is preferable to provide a fluorine-based or carbon-based lubricant on the upper layer of the protective layer.

The soft magnetic film and the ferromagnetic metal film may be formed by separate devices. Alternatively, as shown in FIG. 1, it is also possible to employ an integrally configured device.
In FIG. 1, 1a is a roll on the supply side of the non-magnetic support 2 and 1b.
Is a roll of the non-magnetic support 2 on the take-up side, 3 ₁ , 3 ₂ are cooling can rolls, 4 is a guide roller provided in the traveling path of the support 2, 5 is a target made of a soft magnetic material,
6 is a sputtering power source, 7 is a crucible, 8 is an electron gun, 9 is a magnetic metal, 10 is a shielding plate, and 11 is an oxygen gas supply nozzle. The position of the guide roller 4 is variable, and the angle at which the support 2 is attached to the cooling can roll 3 ₂ can be adjusted. That is, by variably adjusting the set position of the guide roller 4, it is possible to adjust the column inclination θ of the magnetic particles deposited by oblique vapor deposition.

Then, by using the apparatus shown in FIG. 1, whether the mother tape (first magnetic recording medium) M or the blank tape (second magnetic recording medium) B is used, first, the cooling can roll 3 ₁ is used. A support 2 _M running along,
Soft magnetic particles from the target 5 are deposited on the 2 _B by sputtering means, and then the soft magnetic films 20 _M , 2 _M provided on the supports 2 _M , 2 _B running along the cooling can roll 3 ₂ . If the mother tape M or the blank tape B is manufactured by obliquely vapor-depositing the evaporated ferromagnetic metal particles from the crucible 7 on the 20 _B , any of the tapes has the soft magnetic film provided on the non-magnetic support. , A ferromagnetic metal film is provided thereon, and the columns in the ferromagnetic metal film are grown obliquely (see FIGS. 2 and 3).

Here, by variably adjusting the set position of the guide roller 4, the tilt θ ₁ of the column of the ferromagnetic metal film 21 _M in the mother tape M can be set to 20 to 80 °, and the blank tape can be used. The column inclination θ ₂ of the ferromagnetic metal film 21 _{B in B} can be set to 5 to 60 °. An inverted information signal is recorded on the mother tape M by a usual means. Then, the recording information signal of the mother tape M is copied onto the blank tape B by magnetic transfer.

This copy is shown in FIGS. 4 and 5.
Is done. First, as shown in FIG. 4, a mother tape
M ferromagnetic metal film 21_MColumn growth direction at 22
_MAnd the ferromagnetic metal film 21 of the blank tape B_BIn
Lamb growth direction 22_BSo that and intersect, and ferromagnetic
Metal film 21_MAnd the ferromagnetic metal film 21 _BTo come into contact with
Overlap.

Then, the mother tape M and the blank tape B are mounted on the magnetic transfer device of FIG. 5 so that the relationship shown in FIG. 4 is satisfied. The ring type magnetic head 23
By applying a bias magnetic field from the support side of the mother tape M, the recording information signal of the mother tape M is transferred to the blank tape B. In FIG. 5, 23a is a supply reel of the mother tape M, 23b is a take-up reel of the mother tape M, 24a is a supply reel of the blank tape B, and 24b.
Is a reel on the winding side of the blank tape B, 25 and 26 are guide rollers, and 27 is a transfer drum.

When the information signal is copied as described above, it is possible to perform high-speed copying because it is a transfer.
Since the magnetic layer is sandwiched by the soft magnetic layer, the bias magnetic field acts effectively, and the transfer from the low range to the high range is efficiently performed. Hereinafter, the present invention will be described with reference to specific examples.

[0021]

【Example】

[Embodiment 1] FIGS. 1 to 5 are for explaining one embodiment of the present invention. FIG. 1 shows a first magnetic recording medium (mother tape) and a second magnetic recording medium (blank tape). )
2 is a schematic sectional view of a mother tape, FIG. 3 is a schematic sectional view of a blank tape, and FIG. 4 is a schematic side view showing a relationship between the mother tape and the blank tape during transfer. FIG. 5 is a schematic view of the transfer device.

First, as shown in FIG. 1, a non-magnetic support
(PET film with a thickness of 15 μm) 2 _MSupply side roll
1a and the roll 1b on the winding side, and vacuum
10 in the container^-Four-10^-6For a vacuum degree of about Torr
After exhausting, cooling can roll 3₁Running along
Support 2_MThe soft magnetic particles (Fe
-Si alloy particles) is deposited to a thickness of 1000Å and then cooled.
Rejected can roll 3₂Against the support traveling along
By heating the electron beam from the electron gun 8 in the crucible 7.
Metal (Co) 9 is melted and evaporated to remove Co particles to 250
Evaporating to 0Å thickness, support 2_MSoft magnetic film 20 on top_MTo
This soft magnetic film 20_MFerromagnetic metal film 21 on top _MWas set up.
After this, the ferromagnetic metal film 21_MBack on the side opposite the side
Coat layer (layer of binder resin containing carbon black)
Provide a thickness of 0.5 μm and cut into a width of 8 mm for mother
Tape M was obtained.

The mother tape M thus obtained has a structure as shown in FIG.
The column inclination θ ₁ in the ferromagnetic metal film 21 _M is 45.
°, Hc 1670 Oe, Bs 6400 G, Br / B
s was 0.78, and the center line average roughness Ra of the surface of the ferromagnetic metal film 21 _M was 1.8 nm. Also, perform in the same manner, 10μ
m thickness of the PET film 2 _B on the soft magnetic particles (Fe-S
i alloy particles) to a thickness of 1000Å and Co-
Ni (80-20) alloy particles are vapor-deposited to a thickness of 1800Å to form the soft magnetic film 20 _B on the support 2 _B , the ferromagnetic metal film 21 _B on the soft magnetic film 20 _B , and the ferromagnetic metal film 21 _B side. A blank tape B having a width of 8 mm having a back coat layer (a layer of carbon black-containing binder resin) having a thickness of 0.5 μm on the opposite surface was obtained.

The blank tape B thus obtained has a structure as shown in FIG. 3, and the column inclination θ ₂ in the ferromagnetic metal film 21 _B is 2 °.
5 °, Hc is 1050 Oe, Bs is 4600 G, Br /
Bs was 0.71 and the center line average roughness Ra of the surface of the ferromagnetic metal film 21 _B was 2.4 nm. Then, as shown in FIG. 4, so that the growth direction 22 _B of the column in the ferromagnetic metal film 21 _B in the growth direction 22 _M and the blank tape B of the column in the ferromagnetic metal film 21 _M of the mother tape M intersect, In addition, the ferromagnetic metal film 21 _M and the ferromagnetic metal film 21
Superposed such that _B is in contact, and a mother tape M and the blank tape B in the magnetic transfer apparatus of Figure 5 so that this relationship is satisfied mounted, vertically from the support side of the mother tape M by a ring-type magnetic head 23 A bias magnetic field is applied to the blank tape B to apply the recording information signal of the mother tape M (recording information signal of a track pattern opposite to the normal one)
Transferred to.

[Example 2] In Example 1, the soft magnetic film 20 _M has a thickness of 500 Å and is made of an Fe-Si alloy.
The column inclination θ ₁ = 30 °, Hc = 1780 Oe, in the ferromagnetic metal film 21 _M made of Co and having a thickness of 3200Å,
Bs = 7300G, Br / Bs = 0.88, Ra = 1.
The 1 nm mother tape M and the soft magnetic film 20 _B have a thickness of 50.
00Å made of Fe-Si alloy and has a thickness of 1200Å
Of the ferromagnetic metal film 21 _{B made} of Co—Ni, the column inclination θ ₂ = 20 °, Hc = 1090 Oe, and Bs = 4.
A blank tape B having 700G, Br / Bs = 0.82, and Ra = 1.9 nm was produced.

Then, the recording information signal of the mother tape M was transferred to the blank tape B in the same manner as in Example 1. [Third Embodiment] In the first embodiment, the soft magnetic film 20 _M has a thickness of 5000 Å and is made of a Fe—Si alloy.
Column inclination θ ₁ = 60 °, Hc = 1580 Oe, Bs = 77 in the ferromagnetic metal film 21 _{M made} of 0ÅCo.
00G, Br / Bs = 0.74, Ra = 1.5 nm mother tape M and soft magnetic film 20 _B with a thickness of 200Å
-Si alloy and 2000-Å-thick Co-Ni
The ferromagnetic metal film 21 inclination of columns in _B consisting of theta ₂
= 28 °, Hc = 1050 Oe, Bs = 4800G, B
A blank tape B having r / Bs = 0.77 and Ra = 1.8 nm was produced.

Then, in the same manner as in Example 1, the recording information signal of the mother tape M was transferred to the blank tape B. In Example 4 Example 1, a soft magnetic film 20 _M is Fe-Al alloy with a thickness 2000 Å, The thickness 300
Column inclination θ ₁ = 20 °, Hc = 1700 Oe, B in the ferromagnetic metal film 21 _{M made} of 0Å Fe—N—O
s = 5800G, Br / Bs = 0.82, Ra = 2.0
nm mother tape M and soft magnetic film 20 _B have a thickness of 200
Å consists of Fe-Al alloy, and has a thickness of 1500 Å C
column tilt θ in the ferromagnetic metal film 21 _{B made} of o
₂ = 5 °, Hc = 1000 Oe, Bs = 6400G, B
A blank tape B having r / Bs = 0.71 and Ra = 2.3 nm was produced.

Then, the recording information signal of the mother tape M was transferred to the blank tape B in the same manner as in Example 1. In Example 5 Example 1, a soft magnetic film 20 _M is Fe-Al alloy with a thickness 100 Å, also 2600 thickness
Ferromagnetic metal film 2 made of Fe-Co (85:15) of Å
Column tilt at 1 _M θ ₁ = 80 °, Hc = 148
0 Oe, Bs = 7900G, Br / Bs = 0.74, R
The mother tape M having a = 1.3 nm and the soft magnetic film 20 _B having a thickness of 5000 Å are made of a Fe—Al alloy and have a thickness of 1
Column inclination θ ₂ = 60 in the ferromagnetic metal film 21 _{B made} of 300Å Fe-Co-Ni (90: 5: 5).
°, Hc = 980 Oe, Bs = 4000 G, Br / Bs
= 0.69, Ra = 1.9 nm blank tape B was produced.

Then, in the same manner as in Example 1, the recording information signal of the mother tape M was transferred to the blank tape B. [Comparative Example 1] A mother tape similar to that of Example 1 was prepared except that the soft magnetic film was not provided.
The same procedure was performed using this mother tape and the blank tape B of Example 1.

[Comparative Example 2] Blank tape B of Example 1
A blank tape was prepared in the same manner except that the soft magnetic film in Example 1 was not provided, and this blank tape and the mother tape M of Example 1 were used in the same manner. [Comparative Example 3] The procedure of Example 1 was repeated except that the mother tape M and the blank tape B of Example 1 were superposed so that the respective magnetic columns were oriented in the same direction.

[Characteristics] Blank tape B obtained in each of the above examples
The reproduction output of the transfer information signal of the commercial high band 8mm
The measurement was carried out using a deck with a modified VTR, and the results are shown in Table 1 below. Moreover, the output of the mother tape M after repeating 5000 times was examined.
Shown in.

Table-1 Reproduction output of blank tape B Output decrease of mother tape M 1 MHz (dB) 5 MHz (dB) (dB) Example 1-1.3-1.0 1.8 Example 2-1.0 -1.1 2.1 Example 3 -1.4 -1.0 1.3 Example 4 -1.8 -2.3 2.4 Example 5 -1.9 -1.5 2.5 Comparison Example 1 -4.1 -3.5 1.9 Comparative example 2 -2.6 -2.3 2.2 Comparative example 3 -3.4 -2.5 2.3 * Head to Head commercially available high band Evaporative tape for recording and reproducing output 0 As can be seen, according to the present invention, reproduction with high reproduction output to a blank tape is possible, and since copying at high speed is possible, mass production of software is inexpensive. Can be done at a reasonable cost.

Also, the output of the mother tape is unlikely to decrease.

[0034]

According to the present invention, it is possible to mass-produce software having a high reproduction output from a low frequency range to a high frequency range at a low cost.

[Brief description of drawings]

FIG. 1 is a schematic view of an apparatus for producing a mother tape and a blank tape.

FIG. 2 is a schematic sectional view of a mother tape.

FIG. 3 is a schematic sectional view of a blank tape.

FIG. 4 is a schematic side view showing the relationship between a mother tape and a blank tape during transfer.

FIG. 5 is a schematic view of a transfer device.

[Explanation of symbols]

1a supply roll 1b winding-side roll 2, 2 _M, 2 _B support 3 _1, 3 ₂ cooling can roll 4 guide rollers 5 target 7 crucible 9 magnetic metal M mother tape (first magnetic recording medium) B Blank Tape (Second magnetic recording medium) 20 _M , 20 _B soft magnetic film 21 _M , 21 _B ferromagnetic metal film 23 ring type magnetic head

Front Page Continuation (72) Inventor Shigemi Wakabayashi 2606, Akabane, Kai-cho, Haga-gun, Tochigi Prefecture Kao Co., Ltd.Institute of Information Science Research (72) Inventor Akira Shiga 2606 Akabane, Kai-cho, Haga-gun, Tochigi Kao Co., Ltd. Information Science In the laboratory

Claims (9)

[Claims] 1. A soft magnetic film is provided on a non-magnetic support,
A magnetic recording medium having a ferromagnetic metal film provided thereon, wherein the ferromagnetic metal film is formed by obliquely growing columns in the magnetic film. 2. A recorded magnetic recording medium used for transferring a predetermined information signal to another magnetic recording medium, wherein the magnetic recording medium is provided with a soft magnetic film on a non-magnetic support. The magnetic recording medium according to claim 1, wherein a ferromagnetic metal film is provided on the magnetic metal film, and the magnetic film has a column inclination θ ₁ of 20 to 80 °. 3. A magnetic recording medium used when an information signal of a recorded magnetic recording medium is transferred, the magnetic recording medium comprising a non-magnetic support and a soft magnetic film provided on the non-magnetic support. The magnetic recording medium according to claim 1, wherein a ferromagnetic metal film is provided, and the ferromagnetic metal film has a column inclination θ ₂ of 5 to 60 ° in the magnetic film. 4. The soft magnetic film having a thickness of 100 to 5000 Å, claim 1, claim 2 or claim 3.
Magnetic recording medium. 5. A method for transferring an information signal recorded on a first magnetic recording medium to a second magnetic recording medium, wherein the first magnetic recording medium comprises a soft magnetic material on a non-magnetic support. A film is provided, a ferromagnetic metal film is provided on the film, and columns in the ferromagnetic metal film are grown obliquely. The second magnetic recording medium is a soft magnetic film on a non-magnetic support. Are provided, and a ferromagnetic metal film is provided thereon. The column in the ferromagnetic metal film is grown obliquely. The column in the ferromagnetic metal film of the first magnetic recording medium and the column 2. The transfer method characterized in that the magnetic field is applied such that the magnetic field of the ferromagnetic metal film of the magnetic recording medium intersects with the growth direction of the column and the ferromagnetic metal films are positioned inside each other, and a bias magnetic field is applied. 6. The first magnetic recording medium and the second magnetic recording medium have a column inclination (θ ₁ ) in the ferromagnetic metal film of the first magnetic recording medium ≧ ferromagnetic property of the second magnetic recording medium. 6. The transfer method according to claim 5, wherein the metal films are combined so as to satisfy the relationship of the column inclination (θ ₂ ) in the metal film. 7. The tilt (θ ₁ ) of the column in the ferromagnetic metal film of the first magnetic recording medium is 20 to 80 °, and
6. The inclination (θ ₂ ) of the column in the ferromagnetic metal film of the magnetic recording medium of 5 is 5 to 60 °.
Alternatively, the transfer method according to claim 6. 8. The first magnetic recording medium and the second magnetic recording medium are the column inclination in the ferromagnetic metal film of the first magnetic recording medium and the column inclination in the ferromagnetic metal film of the second magnetic recording medium. 8. The transfer method according to claim 5, wherein the difference (θ ₁ −θ ₂ ) from the inclination is 0 to 75 °. 9. The transfer method according to claim 5, wherein a bias magnetic field is applied vertically from the side of the first magnetic recording medium by a ring type magnetic head.