JPH10198940A - Magnetic recording medium, and method for magnetic recording - Google Patents

Abstract

PROBLEM TO BE SOLVED: To offer a magnetic recording medium, of which output difference is small between those in normal and reverse running directions of a magnetic head and reproduction output is large. SOLUTION: This magnetic film is a laminate of a plurality of oblique vapor deposition magnetic films in a magnetic recording medium having a supporting body and a magnetic film, and is constituted so that an angle θa forming to the above magnetic film surface of the upper layer vector A specified by a magnetic column composing the above upper oblique vapor deposition magnetic film of the above oblique vapor deposition magnetic layers satisfies 0 deg.<θa<90 deg. (or 90 deg.<θa<180 deg.) and an angle θg forming to the above magnetic film surface of a composite vector G of the above upper layer vector A and a lower layer vector B specified by the magnetic column composing the lower layer oblique vapor deposition magnetic film adjacent to the above upper layer oblique vapor deposition magnetic film satisfies 90 deg.<θg<180 deg. (or 0 deg.<θg<90 deg.).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a magnetic recording medium.

[0002]

2. Description of the Related Art In a magnetic recording medium such as a magnetic tape, a magnetic film provided on a support is not a coating type using a binder resin and does not use a binder resin due to a demand for high density recording. A metal thin film type has been proposed. That is, a magnetic recording medium having a magnetic film formed by means such as vacuum evaporation has been proposed. This type of magnetic recording medium has a high filling density of a magnetic material and is suitable for high-density recording.

[0003] Incidentally, a laminated type in which a magnetic film formed by oblique deposition means (abbreviated as obliquely deposited magnetic film) is composed of two or more layers has been proposed. In some of the proposals, the direction of the magnetic columns constituting the obliquely deposited magnetic film is not the forward direction (reverse direction) between the upper layer and the lower layer (Japanese Patent Laid-Open No. 4-37).
2710). Then, instead of setting the direction of the magnetic column of the upper obliquely deposited magnetic film and the direction of the magnetic column of the lower obliquely deposited magnetic film in the forward direction, the direction of the magnetic column of the upper obliquely deposited magnetic film and the lower When the direction of the magnetic column of the deposited magnetic film is opposite to the direction of the magnetic column of the magnetic film, the output difference due to whether the traveling direction of the magnetic head is in the forward direction or not is declared small. I have.

[0004]

However, the output difference can be sufficiently reduced only by reversing the direction of the magnetic column of the upper obliquely deposited magnetic film and the direction of the magnetic column of the lower obliquely deposited magnetic film. Was not. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a magnetic recording medium having a small output difference due to the forward / reverse running direction of a magnetic head and having a large reproduction output.

[0005]

An object of the present invention is to provide a magnetic recording medium having a support and a magnetic film, wherein the magnetic film is formed by stacking a plurality of obliquely deposited magnetic films. When the angle θa between the upper layer vector A defined by the magnetic columns constituting the upper obliquely deposited magnetic film and the magnetic film surface is 0 ° <θa <90 ° (or 90 ° <θa <180 °). With respect to the magnetic film surface, a composite vector G of the upper layer vector A and a lower layer vector B defined by a magnetic column constituting a lower obliquely deposited magnetic film adjacent to the upper obliquely deposited magnetic film is provided. The angle θg is 90 ° <θg <180 ° (or 0 °
<Θg <90 °).

In particular, in a magnetic recording medium having a support and a magnetic film, the magnetic film is formed by laminating a plurality of obliquely deposited magnetic films. The angle θa of the upper layer vector A defined by the constituent magnetic columns with respect to the magnetic film surface
Is 0 ° <θa <90 ° (or 90 ° <θa <180 °)
And the angle θb of the lower layer vector B defined by the magnetic columns constituting the lower obliquely deposited magnetic film adjacent to the upper obliquely evaporated magnetic film with respect to the magnetic film surface is 90 ° <θb <. 180 ° (or 0 ° <θb <90
°), and the angle θg formed by the combined vector G of the vector A and the vector B with respect to the magnetic film surface is 9
The problem is solved by a magnetic recording medium characterized in that it is configured so that 0 ° <θg <180 ° (or 0 ° <θg <90 °).

Incidentally, the magnetic film may have not only two layers but also three or more layers. In such a case, the upper layer vector A is defined by the magnetic columns constituting the uppermost obliquely deposited magnetic film in the obliquely evaporated magnetic film, and the lower layer vector B is lower than the uppermost obliquely evaporated magnetic film. All of the vectors defined by the magnetic columns constituting the obliquely deposited magnetic film on the side are combined vectors.

In the above-mentioned magnetic recording medium, the angle .theta.
It is preferable that h is configured to satisfy the following formula [I]. Formula [I] 0.8 ≦ 40λ / θh ≦ 2.0 where λ is the shortest recording wavelength of a signal used for recording on a magnetic recording medium, and the unit is μm.

The unit of θh is °. Further, the above-mentioned problem is solved by a magnetic recording method characterized in that recording is performed on the above-mentioned magnetic recording medium using a signal whose shortest recording wavelength λ satisfies the following formula [I]. Formula [I] 0.8 ≦ 40λ / θh ≦ 2.0 where θh is an angle formed by an imaginary line perpendicular to the magnetic film surface of the composite vector G in units of °.

The unit of λ is μm. That is, with the above configuration, a balance is obtained between the upper obliquely deposited magnetic film and the lower obliquely deposited magnetic film, and a large reproduction output is obtained regardless of the running direction of the magnetic head. Can be

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing an embodiment of the present invention, first, an upper layer vector A defined by a magnetic column constituting an upper obliquely deposited magnetic film, and a magnetic film surface of the upper layer vector A will be described. The angle θa to be formed, the lower layer vector B defined by the magnetic columns constituting the lower obliquely deposited magnetic film, the angle θb to the magnetic film surface of the lower layer vector B,
A composite vector G of the vector A and the vector B, an angle θg of the composite vector G with respect to the magnetic film surface, and an angle θh of the composite vector G with a virtual line perpendicular to the magnetic film surface
Will be described based on FIG.

In FIG. 1, 1 is a support, 2b is a lower obliquely deposited magnetic film provided on the support 1, and 2a is an upper obliquely deposited magnetic film provided on the lower obliquely deposited magnetic film 2b. is there. Since these magnetic films 2a and 2b are formed by oblique evaporation means, the magnetic columns indicating the growth direction of columnar crystal grains in each magnetic film are as shown in FIG. The magnetic column shown in FIG. 1 is obtained by cutting the support 1 (magnetic recording medium) provided with the obliquely deposited magnetic film in the longitudinal direction of film formation and taking a photograph of the cross section. A vector A or a vector B indicated by an arrow defined by connecting a lower end portion and an upper end portion of the arc-shaped line of the magnetic column is an upper layer vector A or a lower layer vector B in this specification. The angle θa is an angle defined by the upper layer vector A and the magnetic film 2a (shown in FIG. 1), and the angle θb is the lower layer vector B and the magnetic film 2b.
(Shown in FIG. 1). The combined vector G is a vector obtained by combining the upper layer vector A and the lower layer vector B. Angle θg
Is an angle (shown in FIG. 1) defined by the combined vector G and the magnetic film 2a. The angle θh is an angle (shown in FIG. 1) defined by the composite vector G and a virtual line perpendicular to the surface of the magnetic film 2a, and indicates an absolute value.
The above physical property values were obtained for 100 magnetic columns and averaged.

The magnetic recording medium of the present invention is a magnetic recording medium having a support and a magnetic film, wherein the magnetic film is formed by laminating a plurality of obliquely deposited magnetic films. An angle θa of the upper layer vector A defined by the magnetic columns constituting the upper obliquely deposited magnetic film with respect to the magnetic film surface is 0 ° <θa <90 ° (or 90 ° <θa <180 °). The combined vector G of the upper layer vector A and the lower layer vector B defined by the magnetic column constituting the lower obliquely deposited magnetic film adjacent to the upper obliquely deposited magnetic film is formed on the magnetic film surface. If the angle θg is 90 ° <θg <180 ° (or 0
° <θg <90 °).
In particular, in a magnetic recording medium having a support and a magnetic film, the magnetic film is formed by stacking a plurality of obliquely deposited magnetic films, and the magnetic film constituting the upper obliquely deposited magnetic film among the obliquely deposited magnetic films. The angle θa between the upper layer vector A defined by the column and the magnetic film surface is 0 ° <θ.
a <90 ° (or 90 ° <θa <180 °) and the magnetic properties of the lower layer vector B defined by the magnetic columns constituting the lower obliquely deposited magnetic film adjacent to the upper obliquely deposited magnetic film The angle θb with respect to the film surface is 90
(Θ <θb <180 °) (or 0 ° <θb <90 °), and the angle θg formed by the combined vector G of the vector A and the vector B with respect to the magnetic film surface is 90 ° <θg.
<180 ° (or 0 ° <θg <90 °). The magnetic film may have two layers or three or more layers. In the case of three or more layers, the upper layer vector A is defined by the magnetic columns constituting the uppermost obliquely deposited magnetic film in the obliquely deposited magnetic film, and the lower layer vector B is defined by the uppermost obliquely deposited magnetic film. All of the vectors defined by the magnetic columns constituting the obliquely deposited magnetic film on the lower side are combined vectors. Further, the angle θh formed by the composite vector G with respect to the virtual line perpendicular to the magnetic film surface satisfies the following formula [I].

Formula [I] 0.8 ≦ 40λ / θh ≦ 2.0 where λ is the shortest recording wavelength of a signal used for recording on a magnetic recording medium, and its unit is μm. The unit of θh is °.

In the magnetic recording method of the present invention, recording is performed on the above-mentioned magnetic recording medium using a signal whose shortest recording wavelength λ satisfies the following formula [I]. Formula [I] 0.8 ≦ 40λ / θh ≦ 2.0 where θh is an angle formed by an imaginary line perpendicular to the magnetic film surface of the composite vector G in units of °.

The unit of λ is μm. Hereinafter, this will be described in more detail. The support 1 of the magnetic recording medium may be magnetic or non-magnetic. Generally, it is non-magnetic. For example, polyethylene terephthalate (PET)
Flexible polymer materials such as olefin-based resins such as polyester, polyamide, polyimide, polysulfone, polycarbonate, and polypropylene, cellulose-based resins, and vinyl chloride-based resins are used. The support is previously subjected to a corona discharge treatment, a heat treatment, an ion bombardment treatment or the like as necessary. The thickness of the support is 1 to 300 μm.

A magnetic film 2b is provided on the non-magnetic support 1. Further, a magnetic film 2a is provided on the magnetic film 2b. In the following, the magnetic film will be described as a two-layer type, but may be a three or more layer type. The magnetic films 2b and 2a are provided using, for example, an oblique vapor deposition apparatus shown in FIG. Therefore, the magnetic films 2b and 2a are obliquely deposited magnetic films. In FIG. 2, 1 is a support, 10 is a cooling can roll, 11 is a crucible, 12 is a magnetic metal filled in the crucible 11, 13 is a shielding plate, 14 is an oxygen gas supply nozzle, and 15 is an electron gun. Then, the inside of the vacuum chamber 16 is
For example, the gas is evacuated to about 10 ⁻⁴ to 10 ⁻⁶ Torr, the magnetic metal 12 is irradiated with an electron beam from the electron gun 15 to evaporate, and metal magnetic particles are deposited (oblique deposition), thereby obliquely depositing the magnetic film 2b, 2a is provided.

The obliquely deposited magnetic films 2b and 2a are formed so as to satisfy the above conditions. In particular, the thickness of the magnetic film 2b is 5
The thickness of the magnetic film 2a is 500-2000 ° (especially, 600-1500 °).
500 °). The angle θb defined by the magnetic column of the magnetic film 2b is 90 ° (90 °).
° is not included) to 170 ° (especially 110 to 160 °),
The angle θa defined by the magnetic column of the magnetic film 2a is 15 to 90 ° (excluding 90 °) (particularly, 20 to 70 °).
°). The angle θg defined by the combination of the magnetic column of the magnetic film 2b and the magnetic column of the magnetic film 2a is 90 ° (excluding 90 °) to 1 °.
The film is formed to have an angle of 40 ° (particularly, 95 to 130 °). The formation of the magnetic film having the above characteristics can be found by repeating experiments.

Coercive force H by obliquely deposited magnetic films 2b, 2a
c is 1000-2000 Oe, saturation magnetic flux density Bs is 40
00 to 8000G. As a material of the magnetic metal 12 constituting the obliquely deposited magnetic films 2b and 2a, for example, Fe, C
o, Ni, and other metals, Co-Ni alloy, 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 an alloy containing any of these different metals is used. Incidentally, as the magnetic film, a nitride of the above material (for example,
Fe-N, Fe-NO) and carbides (eg, Fe-
C, Fe-CO) and the like.

The magnetic film has a thickness of 10 to 500.degree.
A protection film 3 made of an oxide, a nitride, a carbide or the like of about 200 ° is provided. For example, specific examples include carbon such as glassy carbon and diamond-like carbon, boron carbide, and silicon nitride. Particularly preferred is diamond-like carbon.
For example, the protective film 3 made of diamond-like carbon can be formed using an ECR microwave plasma CVD device.

If necessary, the lubricant film 4 is immersed.
About 5 to 70 に よ り by means of pickling or ultrasonic spraying
Thickness. Use various lubricants
I can do it. As a preferred example, for example,-(C (R) F-CF_Two-
O)_p-(However, R is F, CF _Three, CH_ThreeGroup), special
HOOC-CF_Two(O-C_TwoF_Four)_p(OCF_Two)_q -OCF_Two-COOH, F- (CF_TwoCF
_TwoCF_TwoO)_n-CF_TwoCF_TwoCarboxyl group modified perfluoro such as COOH
Oropolyether, HOCH_Two-CF_Two(O-C_TwoF_Four)_p(OCF_Two)_q -OC
F_Two-CH_TwoOH, HO- (C_TwoH_Four-O)_m-CH_Two-(O-C_TwoF_Four)_p(OCF_Two)_q -
OCH_Two-(OCH_TwoCH_Two)_n-OH, F- (CF_TwoCF_TwoCF_TwoO)_n-CF_TwoCF_TwoCH_TwoOH
Such as alcohol-modified perfluoropolyethers
An elementary lubricant is used. Specifically, Audimont
FOMBLINZ DIAC and FOMBLINZ
 DOL, Daikin Industries, Ltd. Demnum SA, and the like.

A back coat film 5 is provided if necessary. The back coat film 5 is formed by applying a paint containing carbon black and a binder resin. Also, metals such as Al-Cu alloys, Si, Ge, A
It can also be formed by evaporating a semimetal such as s, Sc, and Sb. Incidentally, a metal or semimetal can be oxidized, carbonized or nitrided to form an oxide film, a carbonized film or a nitride film.

[0023]

Example 1 Using a diagonal deposition apparatus shown in FIG. 2, a Co metal diagonally deposited magnetic film 2b was provided on a 6 μm thick PET film 1. The conditions for forming the lower obliquely deposited magnetic film 2b are as follows. Running speed of PET film 1; 0.6 m / min Output of electron gun 15; 20 kW Minimum incident angle during oblique deposition; 65 ° Oxygen gas supply from nozzle 14; 30 sccm Thickness of obliquely deposited magnetic film 2b obtained Was 1200 $ according to Rank Taylor Hobson's Taristep. According to the cross-sectional photograph of the obliquely deposited magnetic film 2b,
θb was 133 °.

Thereafter, a Co metal obliquely deposited magnetic film 2a was provided on the obliquely evaporated magnetic film 2b again by using the obliquely deposited apparatus. The conditions for forming the upper obliquely deposited magnetic film 2a are as follows. The traveling speed of the PET film 1; 2 m / min; the output of the electron gun 15; 15 kW The minimum incident angle during oblique deposition; 52 ° The supply amount of oxygen gas from the nozzle 14; 22 sccm The thickness of the obliquely deposited magnetic film 2 a obtained is: According to Rank Taylor Hobson's Taristep, it was 800Å. According to the cross-sectional photograph of the obliquely deposited magnetic film 2a,
θa was 57 °.

The coercive force Hc of these magnetic films 2b and 2a is 1500 Oe and the saturation magnetic flux density Bs is 5800
G and squareness ratio Sq were 0.92. Thereafter, the magnetic film 2
a, a diamond-like carbon film (protective film) 3 having a thickness of 100 mm is provided by using an ECR-CVD apparatus,
Further, a film 4 of a perfluoropolyether-based lubricant was provided thereon at a thickness of 10 °. Further, a paint containing carbon black and a binder resin was applied to the opposite surface so that the thickness after drying was 0.5 μm, and a back coat film 5 was provided.

Thereafter, a magnetic tape was manufactured through a predetermined process.

[0027]

Example 2 A magnetic tape was obtained in the same manner as in Example 1.
The conditions for forming the lower obliquely deposited magnetic film 2b are as follows. Traveling speed of the PET film 1; 1.6 m / min output of the electron gun 15; 20 kW minimum incident angle at the time of oblique deposition; 55 ° oxygen gas supply amount from the nozzle 14; 25 sccm thickness of the obliquely deposited magnetic film 2b obtained Was 1000Å according to Rank Taylor Hobson's Taristep. According to the cross-sectional photograph of the obliquely deposited magnetic film 2b,
θb was 132 °.

The conditions for forming the upper obliquely deposited magnetic film 2a are as follows. Running speed of PET film 1; 2.4 m / min Output of electron gun 15; 15 kW Minimum incident angle during oblique deposition; 45 ° Oxygen gas supply from nozzle 14; 20 sccm Thickness of obliquely deposited magnetic film 2a obtained Was 900 $ according to Rank Taylor Hobson's Taristep. According to the cross-sectional photograph of the obliquely deposited magnetic film 2a,
θa was 60 °.

The coercive force Hc of these magnetic films 2b and 2a is 1350 Oe, and the saturation magnetic flux density Bs is 5400
G and squareness ratio Sq were 0.88.

[0030]

Example 3 A magnetic tape was obtained in the same manner as in Example 1.
The conditions for forming the lower obliquely deposited magnetic film 2b are as follows. Running speed of PET film 1; 0.7 m / min Output of electron gun 15; 20 kW Minimum incident angle during oblique deposition; 60 ° Oxygen gas supply from nozzle 14; 30 sccm Thickness of obliquely deposited magnetic film 2b obtained Was 1500 $ according to Rank Taylor Hobson's Taristep. According to the cross-sectional photograph of the obliquely deposited magnetic film 2b,
θb was 130 °.

The conditions for forming the upper obliquely deposited magnetic film 2a are as follows. Running speed of PET film 1; 2.2 m / min Output of electron gun 15; 15 kW Minimum incident angle in oblique deposition; 45 ° Oxygen gas supply from nozzle 14; 22 sccm Thickness of obliquely deposited magnetic film 2a obtained Was 1000Å according to Rank Taylor Hobson's Taristep. According to the cross-sectional photograph of the obliquely deposited magnetic film 2a,
θa was 60 °.

The coercive force Hc of these magnetic films 2b and 2a is 1400 Oe, and the saturation magnetic flux density Bs is 5600
G and the squareness ratio Sq were 0.9.

[0033]

Comparative Example 1 A magnetic tape was obtained in the same manner as in Example 1, except that the obliquely deposited magnetic film 2a was not provided.

[0034]

Comparative Example 2 Lower Obliquely Deposited Magnetic Film 2 in Example 1
obliquely deposited magnetic film 2 under the conditions for forming b
A magnetic tape was obtained in the same manner as in Example 1 except that a and the lower obliquely deposited magnetic film 2b were formed. The coercive force Hc of these magnetic films 2b and 2a was 1650 Oe, the saturation magnetic flux density Bs was 5500 G, and the squareness ratio Sq was 0.94.

[0035]

Comparative Example 3 A magnetic tape was obtained in the same manner as in Example 1.
The conditions for forming the lower obliquely deposited magnetic film 2b are as follows. Running speed of PET film 1; 1.2 m / min Output of electron gun 15; 20 kW Minimum incident angle during oblique deposition; 65 ° Oxygen gas supply from nozzle 14; 40 sccm Thickness of obliquely deposited magnetic film 2b obtained Was 600 ラ ン ク according to Rank Taylor Hobson's Taristep. According to the cross-sectional photograph of the obliquely deposited magnetic film 2b,
θb was 133 °.

The conditions for forming the upper obliquely deposited magnetic film 2a are as follows. Running speed of PET film 1; 0.6 m / min Output of electron gun 15; 20 kW Minimum incident angle at oblique deposition; 65 ° Oxygen gas supply from nozzle 14; 30 sccm Thickness of obliquely deposited magnetic film 2a obtained Was 1200 $ according to Rank Taylor Hobson's Taristep. According to the cross-sectional photograph of the obliquely deposited magnetic film 2a,
θa was 47 °.

The coercive force Hc of these magnetic films 2b and 2a is 1600 Oe, and the saturation magnetic flux density Bs is 5700.
G and squareness ratio Sq were 0.93.

[0038]

[Characteristics] θa, θb, θg of the magnetic tape obtained in each of the above examples
, Θh and the thickness of the magnetic film are shown in Table 1 below.
Note that θa and θb are the average values of the values obtained from the cross-sectional photographs, while θg and θh are obtained by calculating the composite vector G based on the cross-sectional photographs.

Table 1 Thickness of magnetic film (Å) θb θa θg θh Lower layer Upper layer (°) (°) (°) (°) Example 1 1200 800 133 57 105 15 15 Example 2 1000 900 132 60 95 5 55 Example 3 1500 1000 130 60 100 10 Comparative Example 1 1200--47--Comparative Example 2 1200 1200 133 47 900 Comparative Example 3 600 1200 133 47 75-15 And a signal of wavelength λ (μm) was recorded. The reproduction output of each magnetic tape was examined, and the results are shown in Table 2.

Table 2 (Reproduction Output (dB)) Forward / Backward λ = 0.3 λ = 0.5 λ = 0.3 λ = 0.5 Example 1 + 2.1 + 1.8 + 1.5 + 0 0.3 (0.8) (1.3) Example 2 +1.0 +0.8 -1.0 -1.4 (2.4) (4) Example 3 +2.0 +1.4 +1.0 +0 0.6 (1.2) (2) Comparative example 100 -8.4 -6.5 Comparative example 2 +1.5 +1.4 -5.3 -4.2 Comparative example 3 +1.8 +1.7- 6.1-5.2 (3) (5) * The reproduction output in the forward direction indicates the case where the direction of the magnetic column of the magnetic film in contact with the magnetic head and the running direction of the magnetic head are in the forward direction, and The reproduction output indicates a case where the direction of the magnetic column of the magnetic film in contact with the magnetic head is opposite to the running direction of the magnetic head.

* Values in parentheses are 40λ / θh. * Reference is made to the output in the forward direction of Comparative Example 1 (0 dB) According to this, when the conditions of the present invention are satisfied, a high reproduction output is obtained regardless of the running direction of the magnetic head. Further, it can be seen that the output difference due to the difference in the running direction of the magnetic head is small.

[0042]

The output difference due to the forward / reverse running direction of the magnetic head is small and the reproduced output is large.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a magnetic recording medium.

FIG. 2 is a schematic view of an oblique vapor deposition apparatus.

[Description of Signs] 1 support 2 magnetic film 3 protective film 4 lubricant film 5 back coat film

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takeshi Miyamura 2606 Akabane, Kaigamachi, Haga-gun, Tochigi Pref.

Claims (5)

[Claims] 1. A magnetic recording medium having a support and a magnetic film, wherein the magnetic film is formed by stacking a plurality of obliquely deposited magnetic films, and an upper one of the obliquely deposited magnetic films is The angle .theta.a between the upper layer vector A defined by the constituent magnetic columns and the magnetic film surface is 0.degree. <. Theta. <90.degree.
(Or 90 ° <θa <180 °) and the upper layer vector A and the lower layer vector B defined by the magnetic column constituting the lower obliquely deposited magnetic film adjacent to the upper obliquely deposited magnetic film. A magnetic recording medium characterized in that the angle θg of the combined vector G with respect to the magnetic film surface satisfies 90 ° <θg <180 ° (or 0 ° <θg <90 °). 2. A magnetic recording medium having a support and a magnetic film, wherein the magnetic film is formed by stacking a plurality of obliquely deposited magnetic films, and the upper obliquely deposited magnetic film among the obliquely deposited magnetic films is The angle .theta.a between the upper layer vector A defined by the constituent magnetic columns and the magnetic film surface is 0.degree. <. Theta. <90.degree.
(Or 90 ° <θa <180 °) and a lower layer vector B defined by a magnetic column constituting a lower obliquely deposited magnetic film adjacent to the upper obliquely deposited magnetic film.
Is 90 ° <θb <
180 ° (or 0 ° <θb <90 °), and the angle θg formed by the combined vector G of the vector A and the vector B with the magnetic film surface is 90 ° <θg <180 °
(Or 0 ° <θg <90 °). A magnetic recording medium, characterized in that: 3. The upper layer vector A is defined by a magnetic column constituting the uppermost obliquely deposited magnetic film of the obliquely evaporated magnetic film, and the lower layer vector B is located below the uppermost obliquely deposited magnetic film. 3. The method according to claim 1, wherein all of the vectors defined by the magnetic columns constituting the obliquely deposited magnetic film are combined vectors.
Magnetic recording medium. 4. An apparatus according to claim 1, wherein an angle .theta.h of the combined vector G with respect to an imaginary line perpendicular to the magnetic film surface satisfies the following formula [I]. Magnetic recording medium. Formula [I] 0.8 ≦ 40λ / θh ≦ 2.0 where λ is the shortest recording wavelength of a signal used for recording on a magnetic recording medium, and the unit is μm. The unit of θh is °. 5. A magnetic recording method for recording on a magnetic recording medium according to claim 1, using a signal whose shortest recording wavelength λ satisfies the following formula [I]. Formula [I] 0.8 ≦ 40λ / θh ≦ 2.0 where θh is an angle formed by an imaginary line perpendicular to the magnetic film surface of the composite vector G in units of °. The unit of λ is μm.