JPS5960703A - Magnetic recording and reproducing system - Google Patents

Abstract

PURPOSE:To realize a magnetic recording and reproducing system with high density, high sensitivity and high S/N by performing magnetization of signals adjacent to each other within a magnetic layer surface of a magnetic recording medium and in parallel to each other in the lengthwise direction of a recording truck and at the same time reproducing the recorded signal by a system which detects the signal magnetic field. CONSTITUTION:A magnetic recording head 11 is set for magnetic recording so that the gap width direction is rectangular to the traveling direction 13 of a magnetic recording medium 12. Thus the signal magnetization 15 is within the magnetic surface of the recording medium and recorded to be rectangular to the lengthwise direction (traveling direction 13 of the medium 12) of a recording truck. For reproduction of signals, terminals 21 and 22 are provided at both terminals of a plate type magnetic matter 20 to form a magnetic head. A DC power supply 23 and a resistor 24 which flows a constant current to the matter 20 are connected to the terminals 21 and 22 respectively. The side of the terminal 22 is grounded, and a reproduced output signal is obtained from the side of the terminal 21.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a high-density magnetic recording and reproducing system.

[Technical background of the invention and its problems]

The conventional magnetic recording and reproducing method (hereinafter referred to as longitudinal magnetic recording and reproducing method) is currently widely used both domestically and internationally.
As shown in FIG. call.)
By running relatively on 2 in the direction of arrow 3,
No. 41 magnetization is recorded and reproduced in the plane of the medium 20 parallel to the normal movement direction of the head l.

However, in this method, a demagnetizing field (indicated by the broken line arrow in Fig. 1) is generated due to the influence of the adjacent magnetizations 4, which are opposite to each other, when Jq is recorded on the recording medium 2. In addition, even during r1 generation, the signal magnetic field that can be extracted from the surface of the medium 2 is reduced accordingly, resulting in a reduction in reproduction efficiency.In addition to this, in order to obtain a sufficiently large output sound with a good S/N ratio during reproduction. In order to require a sufficiently large magnetic flux, it is necessary to make the recording track ++v?l'i large. ``At short wavelengths that are less than the thickness of the magnetic layer of the longitudinal medium, the recording magnetization tends to form a closed magnetic path, so this point However, reproduction becomes difficult.Therefore, it can be said that high-density recording and reproduction using the longitudinal magnetic recording and reproduction method is essentially difficult.

Recently, a perpendicular magnetic recording and reproducing system has been developed to solve these problems. This perpendicular magnetic recording/reproduction method is based on a magnetic recording medium 2 (hereinafter referred to as a perpendicular recording medium) in which the anisotropy of the magnetic layer is in the thickness direction, as shown in FIG. 2 as an example.

If necessary, a soft magnetic layer 6 may be provided between the magnetic layer and the medium 20 pace 5. ) fr: A main magnetic pole 7 made of an extremely thin magnetic film with no coil wound around it and a sub magnetic pole 8 around which a coil is wound are sandwiched in a position facing each other, and these two magnetic poles 7.8 and a perpendicular recording medium 2 and 2 relative to each other, signals are recorded and reproduced. The biggest feature of this method is that, as shown by the broken line arrow in Figure 2, the recording magnetization at shorter wavelengths
Since the recorded magnetization forms a closed loop and is stabilized in terms of magnetostatic energy, it is possible to record at a wavelength much shorter than that of the longitudinal magnetic recording/reproducing method. This is one of the things that is expected.

However, the history of research and development of this method is relatively short, and there is a need to further deepen the research and development of both magnetic poles and perpendicular recording media. However, it is more difficult than traditional media. Therefore, considerable technological changes will still be required before a perpendicular recording medium capable of fully utilizing the advantages of this system can compete with conventional media in terms of cost and force. Seem.

On the other hand, in the conventional general reproduction method for reproducing signals recorded on a magnetic recording medium, as shown in FIG. The output was generated based on the electromotive force generated by the reproducing head on the same principle as an electromagnetic generator. However, in such a reproduction method, a sufficiently large magnetic flux is required in order to obtain a sufficiently large reproduction output with a good signal-to-noise ratio, so it is necessary to increase the track width of the recording track.

FIG. 3 shows the relationship between the track width W and the S/N ratio of the reproduced output. As is clear from this figure, when the track width W is as large as, for example, 200 μm, the S/N ratio of the reproduced output is good, but when the track width is k 200
If you gradually reduce the distance from 11m, the S/N ratio will be approximately 3 dBl.
Decrease in oct. Then, if the track width is made smaller than the track width Wo at which the reproduction amplifier noise N and tape noise NT are about the same, NO) NT and SI,
The SN ratio decreases by 6 dB10Ct with the track width Wo as a boundary.

That is, this relationship is expressed by the following equation.

As described above, when the trunk width becomes less than WO, the SN ratio rapidly deteriorates. This deterioration of the SN ratio cannot be improved even if the number of windings of the reproducing head is increased to increase the reproducing output.

This is because the noise No.1I-i of the regenerative amplifier is related to the impedance of the reproducing head, and as mentioned above, as the number of windings in the head increases, the impedance also increases.
This is because o also becomes large. Therefore, although current VTRs, magnetic disks, etc. are required to record and play over long periods of time, and narrow track widths are required, currently the track width W is approximately 20 μm and the S/N ratio is 43 dB.
The maximum value is 8 degrees. As described above, in the conventional magnetic recording/reproducing method, the track width cannot be narrowed, and there is a limit to high-density recording.

[Purpose of the invention]

An object of the present invention is to provide a perpendicular magnetic recording and reproducing system capable of high-density recording of "Jl" degrees or more, and also capable of reproducing the recorded signals with high sensitivity. It is to be.

Another object of the present invention is that a conventional in-plane 416 body itself or a part of a conventional in-plane medium manufacturing apparatus preserved by slight modification can be used as a magnetic recording medium.
Therefore, it is an object of the present invention to provide a magnetic recording and reproducing system which has the advantage of being able to easily and inexpensively supply a magnetic recording medium that implements the present invention.

[Summary of the invention]

Regarding signal recording, the present invention records all magnetizations of the same moment regardless of the recording wavelength so that adjacent signal magnetizations in the plane of the magnetic layer of a magnetic recording medium are formed parallel to the longitudinal direction of the recording track. On the other hand, for signal reproduction, a magnetic material that detects changes in the magnetic field from the magnetic recording medium is used, and changes in the characteristics of this magnetic material are detected as changes in the electrical signal, and the above-mentioned information is applied to the magnetic recording medium. It is designed to reproduce the entire recorded signal as shown in FIG.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to record magnetization of the same moment regardless of the recording wavelength for H1, + record, and it is possible to record magnetization of the same moment regardless of the recording wavelength, and it is possible to record magnetization at high frequencies, that is, short wavelengths, which cannot be recorded in the entire thickness direction with conventional methods. Signal magnetization can also be recorded in the entire thickness direction of the magnetic layer of the recording medium, and the recording magnetization is stabilized in a closed loop at short wavelengths. It has an effect similar to that of a magnetic recording system.Furthermore, since the present invention is similar to the perpendicular magnetic recording system using a longitudinally oriented magnetic recording medium, the perpendicular magnetic i, I) magnetic layer thickness of the recording medium It also has the effect that recording magnetization can be stably maintained at short wavelengths even with a track width of a certain degree of deflection. In addition, during recording, it is also possible to record with the main magnetic pole (through and sub magnetic poles) similar to perpendicular magnetic recording, but
It is also possible to use a conventional ring-type head, and in this case, the magnetic spatula (0 gear rough 0 is set as
, it is easy to increase the recording efficiency. Furthermore, in the perpendicular magnetic recording method, the signal magnetic field distribution is wavelength-dependent because it is used for the magnetic flux 'f: f11 generated by the magnetic charge on the surface of the magnetic layer of the magnetic recording medium caused by the adjacent recorded magnetization. On the other hand, the magnetic recording and reproducing method of the present invention has the effect that a magnetic field distribution that substantially depends only on the recording track width direction can be used for reproduction, regardless of the recording wavelength. Furthermore, magnetic reproducing heads containing this magnetic material do not detect changes in magnetic flux like conventional heads, but are sensitive to the strength or direction of the magnetic field, making it extremely difficult to achieve recording density. Even if the total amount of signal magnetic flux is reduced by this, the magnetic flux per unit area of the signal magnetic field block increases rather than decreases, so it has a remarkable effect that it is essentially suitable for reproducing high-density recorded signals.

In this way, the present invention is a system that combines a recording method suitable for high-density recording and a reproduction method suitable for reproducing high-density recording, and it can achieve higher densities than expected with perpendicular magnetic recording and reproduction methods. It enables high-sensitivity, high-signal-to-noise ratio magnetic 6-pin recording and playback, and can be widely applied to audio, video, and magnetic memory for electronic devices.

[Embodiment J of the invention FIG. 4 is a perspective view showing an embodiment of the invention. As shown in the figure, a magnetic recording head 1) to which a recording signal is supplied is arranged facing the magnetic layer surface of a magnetic recording medium 12.

Magnetic recording medium 126-t, <j? 'l recording head 11
Arrow βJJ against VC? It travels relative to the direction p shown by. Therefore, as the magnetic recording medium 12 travels, an 11 recording track 14 is formed along the traveling direction.

The difference between the recording method of this embodiment and the conventional recording method in the longitudinal direction is that, as shown in the figure, the magnetic recording head 11 is and arrange it so that the gap width direction is perpendicular.
The point is that it is recorded magnetically. That is, as a result of this, the signal magnetization 15 is in the plane of the magnetic surface of the recording medium and in the longitudinal direction of the recording track (the running direction J of the magnetic recording medium 12).
,? ) are recorded so that each h has an angle of 11 [.

Figure 5 (a) is a plan view of a magnetic recording medium showing the pattern of magnetic recording recorded by magnetization according to the above embodiment, and Figure (g) is a 1 m cross-sectional view thereof. Figure 5 (a)
As shown by the broken line arrow in t, according to the present invention, adjacent recording magnetizations 15 form a closed loop and strengthen each other, so that the magnetization state is stabilized. This effect is most noticeable at short wavelengths. Moreover, as shown by the broken line in FIG. 5(b), signal magnetization at a high frequency, that is, a short wavelength, which cannot be recorded in the entire thickness direction using the conventional method, can be recorded throughout the thickness direction of the magnetic layer of the recording medium. Therefore, it is extremely effective for short wavelength recording.

On the other hand, regarding signal reproduction, as shown in FIG. 4, terminals 21 and 22 are provided at both ends of a plate-shaped magnetic body 20 to constitute a magnetic reproducing head. These terminals 21 and 22VC are connected to a DC power supply 23 and a resistor 24 for flowing a constant current to the magnetic body 20.

The terminal 22 side is grounded, and a reproduced output signal is obtained from the terminal 21 side.

When the magnetic reproducing head configured as described above is caused to run relative to the recording track 14 on the magnetic recording medium 12, a signal magnetic field that changes according to the recording magnetization 15 is applied to the reproducing head, causing magnetic The body 20 causes a magnetoresistive effect, and the electrical resistance of the magnetic body 201 changes. By detecting this resistance change as a voltage change using the circuit described above, high sensitivity, high S N , and 14Z signal images can be obtained. In addition, as the magnetic body 20,
? - A soft magnetic material based on Fa-N1 alloy such as malloy may be selected.

The recording method and the reproducing method have been explained separately for the actual Jifli example in Figure 2g4, but in the above recording method, as shown in Figure 6+a) and fb), each recording density is 61cm in the recording medium running direction. Even if the recording wavelength is shortened to 1 iV
Even if the signal magnetic field is increased in the K direction (that is, the track width is made smaller), the strength of the signal magnetic field increases.Moreover, the above-mentioned reproduction method can detect even small changes in the signal magnetic field with high sensitivity and achieve a high S/N.
In order to be able to reproduce all 16 issues at a ratio, as shown in Figure 4, by combining these recording methods and the 111R recording method, magnetic AI enables a higher density recording than ever before. method can be realized.

Figures 71-1 and 2n8 show other examples of actual artillery according to the invention. In these examples, the H record is similar to the example shown in Figure 3, so only with respect to playback. explain.

In FIG. 7, a plate-shaped magnetic body 20 is wound with a coil 26 to constitute a magnetic reproducing head. A capacitor 27 is connected in parallel to the coil 26 to form a tuned circuit, one end of which is grounded, and four output ends connected to a high frequency oscillator 29 via a capacitor 28. Capacitor 28 is high frequency oscillation 2 non-29
The purpose is to allow h to be isometrically regarded as a current source and to cut the direct current, and h is set to a small value so as not to affect each of the above-mentioned tuning turns. On the other hand, capacity 27
One end of is further connected to a peak detection circuit 30.

The peak detection circuit 30 includes a diode 31, a resistor 32 connected between the cathode of the diode 31 and ground, and an additional capacitor 33 connected in parallel with the resistor 32.

In such a configuration, when a magnetic reproducing head formed by winding a coil 26 around the magnetic body 20 is brought into contact with the magnetic recording medium i2 on which a signal has been recorded, a magnetic field that changes in accordance with recording on the magnetic recording medium 12 is generated. is applied to the magnetic reproducing head, and thereby the magnetic permeability μ of the magnetic body 20 changes as shown in FIG. Here, as the magnetic body 20, a material with a large change in μ,
For example, thin film permalloy, Sendust.

When Mn-Zn ferrite (single crystal hot pressed) is selected, the inductance of the coil 26 changes greatly due to this change in μ, and this causes the g'l'1 circuit consisting of the coil 26 and each company 27 to Tuning frequency changes. Therefore, for example, if the initial tuning frequency of the circuit is set to 1 during this period, as shown in Figure 9 fa) by the solid Ql characteristic curve,
When ro is set, the tuning frequency changes to <fro' as shown by the broken line characteristic curve in FIG. 9(a) as the inductance of the coil 26 changes. Therefore,
When the frequency of the high frequency signal supplied from the high frequency oscillator 29 to this tuning circuit is set as ff1 in FIG. 9(a), the voltage generated across the tuning circuit changes from V to v2. Therefore, the output of the high frequency oscillator 29 is as shown in FIG.
), the signal is amplitude modulated by the recording signal of the magnetic recording medium 12. The high frequency signal received by this modulated sound is supplied to a peak detection circuit 30, and its peak value is detected. As a result, a detection waveform, ie, a signal reproduction output, as shown in FIG. 9(c) is obtained.

In this way, the present invention is different from the conventional reproduction method using a ring-type reproduction head, in that the high frequency resonance output is controlled by the strength, direction, and change of the magnetic field from the recording medium, so that the reproduction output energy can be controlled. can be supplied from an oscillator and responds with high sensitivity even to extremely small changes in the magnetic field, making it possible to obtain a large output signal with a good signal-to-noise ratio.

In the above embodiment, a case has been described in which a signal is reproduced by using a change in the tuning frequency due to a change in μ of the magnetic material of the reproducing head. It is possible to perform signal reproduction by fully utilizing the change in the sharpness Q of the tuning circuit due to the change in high frequency loss. That is, when the magnetic field 5T from the magnetic recording medium changes, the high frequency loss changes depending on the state of magnetization of the magnetic material of the reproducing head, and as a result, the sharpness 1iQ of the tuning circuit changes. Therefore, as a magnetic material, this material also has a large change in frequency loss due to changes in magnetism, such as conventional microwave ferrite (Mn-Mg ferrite, Nl thread N, -A/
A large change in Q can be obtained by using high-frequency ferrite (e.g., spherite YIG yarn and its A/-substituted product), gumalloy, sendust, or amorphous alloy. When Q changes, both 'lbl'1(
(The pressure changes as shown in Figure 10).

As shown in Fig. 10(b), the high frequency resonance output becomes completely amplitude modulated due to the change in Q.
l. Be sure to detect all peaks. 5"4' (Fig. 10)
c), it is possible to obtain a reproduced output.

There are two reproduction methods such as 12 and 1llS L, namely, a reproduction method that utilizes a change in the tuning frequency due to a change in μ of the magnetic material of the reproducing head, and a reproduction method that utilizes a change in the Q of the tuning circuit due to the high frequency loss of the magnetic material. Although it is possible to select only one of the reproduction methods, since the phenomenon of a change in the tuning frequency of the tuning circuit and a change in Q can be achieved simultaneously, it is possible to perform reproduction by utilizing these two phenomena at the same time. Also good.

Further, in the above embodiment, it is assumed that a change in μ in a low magnetic field and a change in high frequency loss are used, but it is also possible to use resonance absorption that occurs in a high magnetic field.

Figure 11 shows how the tensor magnetic permeability I and its loss term μ'' at high frequencies change depending on the external magnetic field. The side where resonance occurs is taken, where the direction of the differential motion and the rotation speed match the direction of the high-frequency circularly polarized wave and the rotation speed.

As can be seen from this figure, magnetic materials generally have magnetic permeability μ (tensor magnetic permeability μ′) and loss I′ in low magnetic fields.
In addition to exhibiting the characteristic of changing the tensor permeability I+loss (resonance loss) due to the phenomenon of resonance absorption in high magnetic fields, it also shows the 11N property K in which the tensor permeability I+ loss (resonance loss) changes. Therefore, the same regeneration as described above can be performed using this resonance absorption section. In this case, it is necessary to apply a .9ias magnetic field to the magnetic body 44 in advance. The bias magnetic field can be applied by applying a permanent (orthogonal) direct current or an alternating current magnetic field as required by an electromagnet to the magnetic body K. In this case, the resonant magnetic field 14R (Z direction) is applied to the x-y plane perpendicular to this. If the frequency of the high-frequency magnetic field is kf, then the relationship U is as shown below.

/=-t/(menma W-Fuji role)-)lower d--Ding('HR
- Hand A]j;
*The demagnetizing field coefficient when the directions of the resonant magnetic field (external magnetic field) are two directions: NX+Ny+N2=4π Ms'', h: M sum magnetic field Here, for example, a needle-shaped magnetic body (Nx=Ny=2π).

When applying an external magnetic field along the t-slot of N2=0), upper +
The equation of +(2 is f - r (HB +2 πMs), and if the saturation magnetization value is set to an appropriate full speed, it is easy to maintain the recorded state by reducing the resonant magnetic field HR to less than the coercive force of the tape of 300 to 500 Oersteds. For example, if f = 560 MHz, a magnetic material with a saturation magnetization of 300 Gauss, such as yttrium iron garnet (Y
In the case of the aluminum substituted product of G), r5 is 50 oersted.

Therefore, if the bias magnetic field is set in the vicinity of 50 oersteds, changes in the tensor magnetic permeability or its loss due to the resonance phenomenon can be easily seen.

If the bias magnetic field (including the no-bias magnetic field state) is set to a value lower than 50 oersted and below the coercive force that does not reach the saturation state, it will be easier to extract the change in the low magnetic field loss as described above. .

The embodiment shown in FIG. 12 has metal plates 4 on both sides of the magnetic body 2o.
1.42F was deposited to form a capacitance element, and an inductance element 43 was connected in parallel to this capacitance element to form a tuning circuit.The rest of the point plate is the same as the embodiment shown in FIG.

In this case, if a material with a large change in μ due to the magnetic field and extremely low conductivity is selected as the magnetic material 20, such as a thin film of spinel-based or garnet-based ferrite, and used in a frequency range where high frequency loss does not occur,
The magnetic permeability of the magnetic material 20 changes greatly depending on the number (g) from the magnetic recording medium 12, and as a result, the apparent capacitance of the capacitance element composed of the magnetic material 20 and the metal plates 41 and 42 increases. changes greatly, and as a result, the tuning frequency of the tuning circuit made up of this capacitance element and the inductance element 43 changes.Therefore, by utilizing this change in the tuning frequency of the tuning circuit, the embodiment and the circuit shown in FIG. (,・0 can perform 11th grade.

Of course, even in this actual bTIi example, it is possible to reproduce the signal by fully utilizing the change in sharpness +wQ of the tuning circuit due to the change in the high frequency jL1 loss of 6B 20.

Here, for example, a magnetic material with low conductive loss (e.g. aluminum-substituted yttrium iron-gain ferrite)
A high frequency 1 ■ pressure (500 M [(z)) is applied to a capacitance element sandwiched between metal plates on both sides, and the impedance 2 when an external magnetic field is applied and when it is not applied.
FIG. 13 shows a plotted diagram of the real part R, and the ratio R1Ro of R, which was experimented with by changing the external magnetic field. However, the shape of the magnetic body 20 was a disk shape of 10φ and 1t, and the external magnetic field was applied in the radial direction. According to this, when the external magnetic field is increased from zero to about 800e, an extremely large change in R■/R□ of about 75% can be obtained. In addition, in this embodiment, the magnetic change of so-called direct current resistance and the conduction current can be ignored, so the conduction loss is low, and R□0 is the displacement flowing between the two pole plates. This is thought to be a change in the apparent resistance of impedance due to high-frequency magnetic loss caused by the interaction between the magnetic material and the magnetic material.
This enables N-ratio signal reproduction.

FIG. 114 shows yet another embodiment. In this embodiment, V:l is provided on both pii and i of the plate-shaped magnetic body 2o.
1,--J, which forms part of the tuned circuit, are connected to J21 and 22.
1llll+cable 50 is connected)t, this same 1t11
The center conductor 5 of the 1 cable 50 is connected directly to the high frequency generator 29 by the 4 trimmer converter 53 and the matching capacitor 54, 28. Dotsukuda 1 cable 5
The outer conductor 52 of 0 is grounded. On the other hand, the rotary cable side of the tuning trimmer capacitor 53! ;The IA terminal is connected to the peak detection circuit 5oVc. According to this example,
Same as the embodiment shown in Figure 7, a) 1 town life can be performed using White's principle. On the male side, suitable materials for the magnetic material 20 include materials with a large change in μ, for example, thin 100% aluminum, aluminum, and cobalt-based amorphous alloys. be.

A high frequency current is passed through such a conductive magnetic body 20,
The ratio of the real part Rn of impedance 2 to RO when an external magnetic field is applied to the saturation state and when it is not applied to the saturation state RoJ, f
According to t, in the case of a cobalt-based amorphous alloy, 5
00 P, G (at z, Ro/Rn is about 4, so it can be seen that the change is very large. In the case of permalloy, it is 500
At MHz, it is approximately 1.5. 0.95 at lower frequencies
This seems to be due to the direct current magnetoresistance effect.

On the contrary, this figure shows that the present invention utilizes changes in the apparent resistance component of impedance based on high-frequency magnetic loss, which is essentially different from the reproducing magnetic head that uses so-called direct current resistance magnetic field changes. It will be understood that the improvement effect is also extremely large.

16 to 20 show other embodiments of the recording method of the present invention. In the embodiment described above, the deviation b also directs the gap width direction of the magnetic recording head 11 to the magnetic recording medium 12.
0 By providing in a direction perpendicular to the running direction,
The signal magnetization 15 is formed in a direction perpendicular to the running direction of the magnetic recording medium 12 (?+L recording track 14 direction).

The embodiment shown in FIG. 16 is a magnetic recording head.

The width direction of the gap 11 is provided so as to be slightly inclined with respect to the running direction of the magnetic ML recording medium 12. Therefore, the signal magnetization is also formed obliquely with respect to the running direction of the magnetic recording medium 12. Even in this embodiment, since adjacent signal magnetizations are formed in parallel in the longitudinal direction of the recording track, substantially the same effect as in the previous embodiment can be obtained.

FIG. 17 shows the present invention in a helical videotape recorder (
This example shows an example applied to signal recording of a VTR. In a helical type VTR, a rotary magnetic recording head 11 runs diagonally (in the direction of arrow 18) with respect to the running direction (direction of arrow 13) of the magnetic recording medium 12, thereby forming a recording track 14. In this case, in the embodiment of the present invention, the direction perpendicular to the running direction of the magnetic recording head 11 is set as the gap width direction of the recording head 11 (No. 4 is recorded. Therefore, each (No. J magnetization 15 is magnetic They are formed in parallel in the direction perpendicular to the running direction of the recording head 11. That is, as in the previous embodiment, the signal magnetizations 15 that are in contact with each other are formed parallel to each other in the longitudinal direction of the recording track. Therefore, in this case It is clear that the same effect as the recording method according to the embodiment described above can be obtained.

FIG. 18 shows another embodiment in which the present invention is applied to signal recording in a helical type VTR. This example is the 17th
The difference from the embodiment shown in the figure is that the gap width direction of the magnetic recording head 11 is not perpendicular to the running direction of the magnetic recording head 110 (direction of arrow 18), but is slightly inclined. It is. In this embodiment, the degree of this inclination is selected such that the signal magnetization 15 is perpendicular to the traveling direction (arrow 13 direction) K of the magnetic recording medium 12.

Also in this embodiment, adjacent signal magnetizations 15 are formed parallel to each other in the longitudinal direction of the recording track 14, and the same effect can be obtained.

In FIG. 19, the inclination of the magnetic recording head 1 is further changed to perform magnetization recording such that the direction of the signal magnetization 15 is parallel to the running direction of the magnetic recording medium 12.

In addition, the inclination of the magnetic recording head is set so that the inclination of the magnetic recording head differs by a small angle θ between the signal tracks shown in FIG. This has the effect of making it unnecessary. Note that even in the embodiment shown in FIG. 13, it is also possible to make the inclination of the magnetic recording head different between the direct recording tracks.

As described above, the present invention performs magnetic recording so that adjacent signal magnetizations in the magnetic plane of a magnetic recording medium are formed in parallel to each other in the longitudinal direction of the recording track, and also uses this method to perform recording. , by reproducing the signal by detecting the signal magnetic field, the expected tL in perpendicular magnetization recording and reproduction can be achieved.
This makes it possible to perform magnetic recording 1'J with higher density, fringe sensitivity, and higher signal-to-noise ratio.

In the above embodiments, the magnetic recording medium may be in the shape of a 7° chi or a disk, and the magnetic layer r/
A type oriented in one direction parallel to the i-signal magnetization direction or a type without orientation can be used. Therefore, it can be supplied more easily and at lower cost than perpendicular magnetic recording media.

[Brief explanation of drawings]

Fig. 1 is a principle diagram showing a conventional longitudinal magnetic recording/reproducing method, and Fig. 2 is a principle diagram showing a conventional perpendicular magnetic recording/reproducing method.
FIG. 3 is a diagram showing the relationship between the recording track width and the reproduced signal in the conventional longitudinal magnetic recording/reproducing method, and FIG.
FIGS. 5(a) and 5(b) are a plan view and a vertical cross-sectional view of a magnetic recording medium for explaining the recording magnetization pattern formed by the same embodiment, respectively, and FIG. 6 is a perspective view showing the embodiment. fa) is a diagram showing the relationship between the recording wavelength and the component of the medium surface signal magnetic field in the direction perpendicular to the medium, and FIG. 6(b) is
Figure KS7 shows the relationship between the track width and the track width direction component of the medium surface signal magnetic field at the same recording wavelength. Figure KS7 shows the second embodiment of the present invention. Diagram showing changes in magnetic constant μ, Figure 9(a) t
d A diagram showing how the voltage across the d-tuned circuit changes as the tuning frequency of the d-tuned circuit changes, FIG. 9(b) i-1:
A diagram showing a high frequency oscillation signal waveform that is amplitude modulated by a signal recorded on a recording medium, FIG. 9(c) is a peak detection waveform diagram, and FIG. 10(a) is a peak detection waveform of the tuning circuit. Q
Figure 10 + b) A diagram showing how the voltage across the tuned circuit changes due to changes in . Figure 10 fcl! Figure 11 is a diagram showing the relationship between densor transmission (enemy book/7 and loss ttU17) with respect to the magnitude of the magnetic field; Figure 12 is a diagram showing the entire third embodiment of the present invention; Figure 2n13 is a diagram showing the relationship between the external magnetic field and the real part of impedance of the reproducing magnetic head in the same actual Kfa example, 4) Figure 14 is a diagram showing the fourth embodiment of the present invention, and rJ' Figure 15 is the same example. FIG. 16 is a diagram showing the relationship between the applied high frequency (adversarial frequency) and the real part change of the impedance of the reproducing magnetic head.
Figures 17 to 81 and 20 are diagrams showing 2416 to 9th embodiments applied to the all-hercal type VTIt of the present invention. 11... Magnetic recording head % 12... (Magnetic recording medium, 14... Recording track, 15... Signal magnetization, 2
0...Magnetic material of the reproducing magnetic head. Applicant's agent Patent attorney Takehiko Suzue Figure 5 Figure 6 Name
Y run 2 width Fig. 7 Fig. 8-10+ Fig. 9 (a) E (a) (b) (c) Out Fig. 11 Fig. 16 Fig. 12 Fig. 17 Fig. 18 Fig. 2 Fig. 19

Claims (1)

[Scope of Claims] (1) Recording means for recording signals by arranging a magnetic recording head so that adjacent signal magnetizations are formed in parallel to each other in the longitudinal direction of a recording track in the plane of a magnetic layer of a magnetic recording medium. and detects a change in the characteristics of a magnetic body that detects a change in the magnetic field from the magnetic recording medium. A magnetic recording and reproducing method characterized by: (2) The reproducing means includes a resistive element (actance element) whose part or all of the magnetic material is made of the magnetic material;
The invention is characterized in that it includes a means for detecting a change in resistance or actance of a direct current or a high frequency current flowing into the resistance element or actance element as a result of a change in the total electric signal. The magnetic recording and reproducing method according to scope 1. (3) The reproducing means includes a tuning circuit configured by the magnetic body itself or an actance element coupled to the magnetic body as a tuning element, means for supplying a high frequency signal to the tuning circuit, and a tuning circuit configured to supply a high frequency signal to the tuning circuit. 2. The magnetic recording and reproducing system according to claim 1, further comprising means for detecting a change in a high frequency signal. (4) The recording means records signals by arranging a magnetic recording head on a recording track of a magnetic recording medium such that each signal magnetization is formed at right angles to the longitudinal direction of the recording track. Claim 1 characterized in that
Magnetic recording and reproducing method described in section. (5) The recording means records signals by arranging a magnetic recording head such that its gap width direction is perpendicular to the running direction of the magnetic recording medium. Magnetic recording and reproducing method described in section. (6) The recording means records signals by running a magnetic recording head in a direction diagonal to the running direction of the magnetic recording medium and arranging the gap width direction perpendicular to the running direction. A magnetic recording and reproducing system according to claim 4, characterized in that: (7) In the ii2 recording stage, the magnetic recording head is arranged on the recording track of the magnetic recording medium so that the signal magnetization is formed obliquely with respect to the longitudinal direction of the recording trunk.
1. The magnetic recording method according to claim 1, wherein the magnetic recording method records in@. ()l) The NIJ recording means records signals with the magnetic recording head arranged so that its gap IIV; one direction intersects the running direction of the magnetic recording medium. The magnetic recording and reproducing method according to claim 7. (9) The recording means runs the magnetic recording head in a diagonal direction with respect to the running direction of the magnetic recording medium, and Claims T and iL, in which the 'l' sign indicates that the signal is recorded by arranging the gap width direction obliquely with respect to each other; Reproduction method. (10) The recording means runs the magnetic recording head in a direction oblique to the running direction of one magnetic recording medium, and the gap width direction is parallel to the running direction of the magnetic recording medium. The magnetic recording and reproducing method according to claim 7, characterized in that the magnetic recording and reproducing method records the entire signal by positioning α and the recording means in the gear width direction f of the magnetic recording head.
A magnetic recording and reproducing system according to any one of claims 8 to 10, characterized in that signals are recorded in different arrangements between adjacent tracks. 2. The magnetic recording and reproducing system according to claim 1, wherein the magnetic recording medium has a magnetic layer oriented in-plane and in one direction parallel to the signal magnetization direction.