TW200814007A - Magnetic recording medium, method for production thereof and magnetic recording and reproducing device - Google Patents

Abstract

A discrete track-type magnetic recording medium (30) includes a nonmagnetic substrate (1), a magnetic recording track and a servo signal pattern which are provided on at least one side of the nonmagnetic substrate, and a nonmagnetic part (4) consisting of a nonmagnetic alloy containing Si for physically separating the magnetic recording track and the servo signal pattern. A magnetic recording and reproducing device comprising, in combination, the magnetic recording medium (30), a driving part (26) serving to drive the magnetic recording medium in a direction of recording, a magnetic head (27) composed of a recording part and a reproducing part, a device (28) to impart motion to the magnetic head relative to the magnetic recording medium, and a recording and reproducing signal processing device (29) for entering a signal into the magnetic head and reproducing an output signal from the magnetic head.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording and magnetic recording and reproducing apparatus for use as a hard disk drive. , /' [Prior Art] In recent years, magnetic recording devices such as disk drives, floppy drives and magnetics have increased their importance. 'Many efforts have focused on the recording density of magnetic recording media used in these two garments. Greatly changed. Especially straight, the introduction of technology, making the surface recording density more different. Ϊ Ϊ 于 于 于 细 细 细 细 细 细 验 验 验 验 验 验 验 駄 駄 駄 駄 駄 駄 駄 駄 駄 駄 駄 駄 駄 駄 駄 駄 駄 駄 駄 駄 駄 駄The speed of % continues to increase. The industry has been driving to achieve a higher recording density and to spur its magnetic coercive force w), signal and noise ratio (Chen) = resolution. In recent years, 'we have witnessed the industry's continuous efforts to increase linearity and increase the density of the surface to increase the density of the surface. In the miscellaneous record of , , v, ^=, the density of the road has been _ 11G kTpL. The increase is apt to cause the problem of constructing a noise source in the magnetically transformed transition region and impairing the SNR. This fact hinders the increase in recording density as a result of the magnetic surface recording density, which is a separate § recording bit that needs to be formed in the smallest possible size, because it immediately causes a decrease in the error rate. It is possible to ensure that the saturation magnetization and the magnetic film are as large as possible. However, when the size of the recording bit is more reduced, it tends to produce the following problem: the magnetization of each bit is 'small' and the magnetization caused by the thermal change causes the recorded The disappearance of the data. &,,, = 'Because the track pitch becomes smaller, the magnetic recording device requires a highly accurate production of the tracking sery〇mechanism, and at the same time, it is possible to maximize the influence of the dragon from the adjacent way. Elimination of degree, generally 5 200814007 j adopts a method of performing recording in a large width and performing regeneration in a small width. In this way, this method can minimize the influence between adjacent tracks, but it will cause the following problems to fully obtain the regenerative output, so it is difficult to ensure sufficient SNR. If you want to solve the problem of heat change and get the proper SNR or sufficient output, you should try to increase the density of the way of doing the following way: in the meaning of the recording media, The rule pattern is thus separated from each other physically. In the following, this technique will be referred to as "discrete track (od)", and the miscellaneous record created by this lin is called "discrete track medium". An example of a discrete track medium is a known magnetic recording medium (for example, see JP_A 2004-164692), which is formed on a non-magnetic earth plate having an irregular pattern on the surface, and is capable of obtaining a physically separated magnetic record. Road and servo signal pattern. The magnetic recording medium has a ferromagnetic layer formed on the surface of the substrate by a soft magnetic layer and a film formed on the surface of the substrate, and the filament of the substrate has a plurality of patterns. The magnetic recording ship forms a magnetic recording area separated by environmental magnetic properties in its convex portion. According to the magnetic recording medium, it is considered that since the occurrence of the magnetic walls (: gnetiCWalls) in the soft magnetic layer can be suppressed, the influence of the thermal fluctuation can be easily prevented and the phase interference is allowed to disappear, so that the shapeable wire generates a large amount of noise and high-density magnetic properties. Lu self recorded media. It is known that Yang Shusi ^: method 'that is, 'the method of forming the silk track after the shaft is stacked by a plurality of thin magnetic recording ships, and the thin film magnetic recording on the surface of the substrate or thin in the shape of the secret A method of forming a thin film magnetic recording medium after riding an irregular pattern (for example, Reference Scarf 八八〇 and JP-A 2_-178794). The pre-method is often referred to as "magnetic layer processing type" because it is a mediator during the manufacturing process. The post-method is often referred to as the "emboss precessmg type, although it is not in the manufacturing process. The irregular shape formed on the substrate must persist in the formation, so the disadvantage is that The recording and reproduction for performing recording and reproduction ^", j / pre-position on the medium cannot stabilize the floating posture and height of the head. ☆ The irregular shape formed on the substrate overlaps with the magnetic layer and the protective layer, and the manufacturing method of the ancient carving processing type cannot achieve a flat surface, so the ancient irregular shape continues to exist on the surface to be completed. . In the aspect of the invention, the discrete track type recording medium by the magnetic layer processing type is required to form a magnetic layer for recording on the surface of the substrate and then form a magnetic pattern. : Using the A t method 1mpnntmg method for semiconductors to perform pattern formation, and then drying the part that must be formed, or placing the Si〇2 or carbon-transferring material, ί, Γ ΐ ΐ surface to the flattening process, The _ myeloid layer is covered with a silk surface, and the lubricating layer is formed in two layers. This magnetically etched discrete track medium complicates the manufacturing process, and only forms a source of contamination and is less able to obtain a flat surface. Generally, since the distance between the head and the magnetic layer becomes thinner with the protective film layer; f is small, the magnetic recording medium of the structure of the above method can amplify the output and input signals via the = write head and Increase the recording density. The pit density in the track is determined by the floating height of the head that runs on the surface of the irregular protective film layer. Therefore, how to keep the read/write surface fixed to float constitutes an important task for accomplishing high-figure. Therefore, the 'irregular pattern' needs to be able to allow the head and head to be floated, so that the item head is as close as possible to the magnetic layer and to avoid interference with each other. ,. However, no one has proposed a method of manufacturing discrete media to the eye shovel, which has little risk of causing contamination during the manufacturing process and is capable of forming a flat surface. One of the inventions is directed to the increase in the orbital density of the large-scale field in the magnetic recording room where technical difficulties are encountered due to the increase in orbital density, and thus the increased surface recording density, ensuring a higher record and reproduction than in the past. . In particular, in the case of a discrete track type magnetic recording device which is suitable for forming a concave portion and a convex portion after a magnetic layer on a substrate, the present invention is directed to the generation of a _= layer shift by removing the difference. In addition to the steps to provide a particularly simplified manufacturing method and good red confirmation «write fresh-keeping characteristics [invention content] This view of the obscene-type magnetic recording touches the first aspect of the domain, the US board is not a substrate, magnetic recording The track and the servo signal pattern set in the non-magnetic ίΐϊί,, and the case of the non-magnetic alloy containing & The bribe department separates the magnetic recording obscuration and the health signal map track including the magnetic recording medium according to the first aspect, wherein. The substrate has a surface roughness Ra of 0.1 nm SRa^.O nm. The body, three (four) includes a magnetic recording medium according to the first or second aspect, wherein the magnetic recording track is a perpendicular magnetic recording. The surface of the Sl film is irradiated to the surface of the Sl film by the fabrication method of the discrete track type magnetic recording medium to diffuse Si into the magnetic layer. Record the track and the mine signal _. (10) h away from the Hercules § has been placed for the magnetic recording and regeneration device as the fifth aspect, this ^ sample two of the m. According to the younger - to the third aspect of the magnetic media, the driver, The magnetic head used to drive the recording direction is composed of a recording unit and a reproducing unit; a device for moving the object (4) steeply and moving the body; and a recording and reproducing signal; the tiger = number enters the magnetic head and regenerates Output signal from the magnetic head. Μ In the magnetic layer processing type discrete track miscellaneous record ship towel, the present invention is capable of a kind of magnetic recording medium, which can stably float the __ write head, and has the separation of 8 200814007 S to avoid signal interference between the channels. The clothing = treatment extreme 稷 _ is used to remove the magnetic layer processing type magnetic ray, and thus can contribute to a substantial increase in productivity. The magnetic recording and reproducing apparatus of the present invention has a good recording capacity due to the use of the magnetic recording medium of the present invention. h, '艮好· 【Embodiment】 =1 The cross-sectional structure of the discrete magnetic recording medium of the present invention will be described. The magnetic recording medium 30 of the discrete magnetic recording medium of the present invention has a structure which is produced in the following manner: a shape U square = a soft magnetic layer on the surface and an intermediate layer 2, and a magnetic layer III on the surface The non-magnetized layer 4 and the protective film layer 5; and a lubricating film omitted from the drawing is formed on the outermost surface. Nilfrfr! For the purpose of increasing the recording density, the magnetic layer 3 having the magnetic method has a magnetic portion thickness w of 2 nm and a non-magnetic portion thickness of 2 Å or less. Therefore, for the purpose of increasing the density of the recording, the track pitch p (=w can be as large as 300 nm or less. The optional miscellaneous ground makes it possible to avoid the non-missing substrate. ' ΐΐ A A1 alloy made of A1-Mg alloy as the main component =, substrate made of ordinary broken glass, various acid resin, glass, glass, m, and other resins. In particular, the A1 alloy substrate, the thinned glass substrate and the chopped substrate. The two-side Jiff substrate preferably has a 111111 or a handle contact roughness (Ra), and the W land is 0.5 nm or Less is particularly preferably 〇1 or less. The magnetic layer on the first surface of the non-magnetic substrate of the above quality may be an in-plane (m-plane) magnetic recording layer or a perpendicular magnetic recording layer. Preferably, the magnetic recording 9 200814007 layer is formed of an alloy mainly composed of Co as a main component. For example, a non-magnetic CrM layer can be used for the purpose of recording density. And a laminated structure composed of a ferromagnetic layer as in-plane magnetic The magnetic recording layer used for the recording medium. The magnetic layer can be used as the magnetic recording layer used in the perpendicular magnetic recording medium, and the plural layer can be a backing layer, a position control film, and a selective ^. a layer and a magnetic layer, and the support layer is made of a soft magnetic FeCo alloy (for example

FeCoB, FeCoSffi, FeCoZr, FeCoZrB, FeCoZrBCu, etc.), FeTa human gold (such as FeTaN, FeTaC, etc.) or Co alloy (such as C〇Tazr, CoZrNB, CoB ^, the orientation control film system is Pt, Pd, NiCr, The intermediate layer is made of RU, etc., and the magnetic layer is made of 6〇C〇_15CM$ g 70Co-5Cr-15Pt_10Si〇W. η. Gold or 5 rnntiiH thick, I· or more Thick to 2Gnm or thinner, preferably one or more to 15 nm or thinner. The formation of the magnetic recording layer can only achieve sufficient output and input heterozygosity or greater output. At the same time, Zhong is in the following case of the café, and it is necessary to use the carbon layer (6), hydrogenated carbon (HxC), carbon film (HxC), carbon dioxide (Hb), carbonized bismuth (for example). Sic Bo carbon-containing species, Si〇2, Zr2〇3, Ti; etc.;) Protective film 5 material. Two or more layers can be used to form a protective film layer. The film thickness of the dog, the film layer 5 must be small. If the protective film sounds: 2: the distance between the write head and the magnetic layer increases by i. In general, the protective film layer 4 is preferably formed with a lubricating layer. A lubricant, a hydrocarbon-based lubricant, and a mixture thereof are used as a lubricant. The lubricating layer is usually formed to have a thickness of 1 to 4 nm. Next, the following will be specifically described. The manufacturing method of the discrete magnetic recording medium of the invention. The manufacturing process of the magnetic recording medium usually starts by cleaning and drying the substrate. In order to ensure adhesion between the constituent layers, the present invention is also preferably formed in the magnetic film. Layer = line cleaning and dry wire board. The size of the grade is not limited. This has a magnetic layer of (10) soft magnetic layer formed on the first surface of the substrate, such as medium, 70Cg_5 (10) Pt bribe 2 alloy a layer and a protective layer of carbon. The magnetic recording medium is fabricated by a square: applying a photoresist as a cladding layer; a layer, a pattern; removing the photoresist by reactive ions and corresponding residual carbon to the fraction; Depositing a coating layer on the magnetic layer; y ί, the hetero-substance touches the surface of the Si, thereby causing Si to diffuse in the magnetic layer and forming a circle using the rhyme , f, freshly applied Coating layer, which can make the tweezers die, in the film The protective layer of the reverse or magnetic layer and the pattern of the extruded portion under the Koryo...., 5 solidified tree to form a metal plate having a concave portion and a convex pattern to form a fine-grained signal pattern recording Ordinary data is used in the shape of the roadside - Peng multiply the former, Gray code pattern ((4) in the private light, such as the residual, reactive ion tweezers

II 200814007 (ion milling) and other techniques to remove the photoresist and the photoresist on the surface. Due to these processes, the magnetic layer and the portion of the protective layer on which the magnetic pattern has been formed are left. By selecting the conditions, the protective layer can be completely removed, and only the magnetic layer having the pattern formed thereon is allowed to remain. In order to form a constituent layer of a magnetic recording medium other than the protective film layer 5, an RF sputtering method and a DC sputtering method which are often used for depositing a cladding layer can be used. On the other hand, in order to form a protective film layer, for example, a method of depositing a diamond-like carbon film by P-CVD can be employed. However, this method is not the only way. Next, the structure of the magnetic recording and reproducing apparatus of the present invention is shown in FIG. The magnetic recording and reproducing apparatus of the present invention includes the magnetic recording medium of the present invention, wherein the magnetic driving unit 26 drives the medium in the recording direction, and the magnetic head 27 is composed of a recording unit and a reproducing unit; The write head driving unit 28 is configured to move the magnetic head 27 relative to the magnetic recording medium 30; and the recording and reproducing signal system 4 is combined with the recording unit to enable the signal to enter the magnetic head 27 and regenerate the magnetic field Continued the signal generated by Shantou 27. The recording device can be constructed by combining the above elements. Magnetic recording medium

, f hair 2 is enough to actuate the reproducing head S under the same width S ΐΐ ίίίί ί ί 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 给予 。 给予 给予 给予 给予The human month b is enough to receive the regenerative output and high SNR. Read and write; there are;: magnetoresistive _) strong production, put every silver priest> P so that in the 冋 & recorded mountain is also enough to get satisfactory reading and writing; in 5 two "density of magnetic Strictly record the device. By means of this magnetic field, the south value of the 妒 妒 〇〇 〇〇 〇 〇 〇 m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m The tut recording device, by combining the signal processing circuit that follows the maximum matching decoding into a cow from 4, mllkelhooddecoding method, can be operated to perform recording and regeneration in the following cases: Orbital density of 100k or more, 1210814007 linear recording density of 1000k or more per inch, and recording density of 100g or more per square inch. The examples and comparative examples of the present invention are described. Comparative Example 1: The vacuum chamber in which the glass substrate having the HD position is placed is evacuated to a vacuum of 1.0×10 5 Pa or lower. The glass substrate used herein is Using I^SiA, Αΐ2〇3_Κ2〇, MgOAO j sb2〇rZn〇 as a component Made of glass ceramics. The measured outer diameter is 65 mm and the inner diameter is 2 mm, and has an average surface roughness of 2 A (4). ^ • The thickness is 2 on the glass substrate by ordinary sputtering method. The Si〇2 film of 〇〇nm was used as the relief pre-layer. Next, the obtained coated substrate was imprinted using a stamper prepared in advance and made of Ni. There is 1 〇〇 followed by the track pitch. The mouth = ground adjusts the groove to a depth of 2 〇 nm. The embossing is performed using a stamper with an associated design. Then, the Si0 layer is etched by ion beam etching. The thin portion is up to the depth of the substrate, resulting in an irregular pattern of concave and convex patterns formed on the first surface of the substrate. The first surface of the raft is subjected to the Dc sputtering method in the following order. The soft magnetic layer of the stack = ^, the intermediate layer of RU, and the 70C 〇-5Cr_15Pt_10 Si〇2 alloy, the C (carbon) protective film layer and the fluorine-based lubricating film are stacked by the PeCVD method. ί ΐ FeC〇B soft magnetic layer The thickness is 600, the thickness of the Ru intermediate layer is 100, the thickness of the mouth is 150 A and the thickness of the C (6) is average. Zang obtain this degree of 4 samples as examples of the products of Comparative Example 1 Relief Comparative Example 2: to a glass substrate to a bit of ribs disposed therein a vacuum chamber is evacuated

Li Si, a!1^ low vacuum. Here, the substrate of Gu Zhigang is made of 尧. 2 丄 2 〇, Mg gt; " P205 and Sb2 〇 rZn0 as the composition of the glass terracotta measured the outer diameter of 65mm and the inner diameter of 2 〇 mm, and 13 200814007 2 people's average surface roughness Degree (Ra).

On the Fpf glass substrate, the H ϊ ί layer, the RU intermediate layer, and the 7〇C〇-5CM5Pt_10 Si〇2 alloy magnetic 2 F method stack C (carbon) protection are sequentially stacked by the DC plating method in the following order. Film layer and fluorine-based lubricating film. The thickness of the hl-H layer is _A, the thickness of the Ru intermediate layer is A, and the magnetic carbon layer has an average thickness of 411111. Next, a magnetic pattern is formed on the magnetic layer ϊίί. Specifically, the irregular pattern of the thermosetting tree pre-money is applied, the film is utilized in the vacuum apparatus, and the carbon material is formed for the purpose of the private part. Thereafter, carbon of the f_f type is etched by Ρ-CVD to produce a lubricating member. _ ion beam surname 抽真Ϊϊ 1·〇χ]ίρ. The sample obtained in the above manner was placed in a vacuum chamber which was previously subjected to a hollowing degree, and Ar gas was introduced into the vacuum chamber. A sample of 3' was applied to the sample to bury it iH. This sample was used as a sample of the magnetic layer manufacturing product of Comparative Example 2. When the sample is used, #中1 uses non-magnetic material as the object of implementation. In the manufacture of this board, use Si〇2. The film is manufactured using sputtering technology. Examples 1 to 5: Comparing the vacuum chamber in which the i-direction glass I substrate is disposed to resemble a glass blister; c., working to 真空.0^0 or lower. The glass 'Al2(VK2C)'MgaP2Q5 A Sb2Q3_Zn〇 used here has an average of 65 ug with 2A and a 2G surface, and

FeCoB, stone „' borrowed in the following order ☆ DC _ mining method sequentially stacked = iii, intermediate, and explosive 5 plus _ 丨〇 2 alloy magnetic amount of FeCol ecchymoses m method heap, C (carbon Protective film layer and fluorine-based lubricating film. The thickness of sound is 600 for k dryness, 100 for Ru intermediate layer, magnetic: === for 47, and for 4 degrees. Next, magnetic layer solid wood Specifically, the magnetic recording 14 is manufactured in the following manner: 200814007 Media: applying a photoresist of a thermosetting resin, thereby forming a portion; removing only the coating layer deposited by the method of the presence of = in the reactive_method; Heating the coated diffusion to magnetic radiation 'and forming the mt read pattern; then removing the photoresist and the protective layer, thereby re-forming the magnetic layer; and applying the material to the package. =保^ Γ下酿1 towel(四)Successful Si transfer example 6 to 10: The comparison glass substrate is L_5, A1A_K2〇, MQ ° glass pottery. The measured outer diameter is 65 surface structure ^ with 2A Average surface roughness (Ra). H仏 is 20mm, and

Pecot 5a 15Tf

&M. P-CVD A, Ru intermediate layer with =; film magnetic: body:: heating the photoresist of the solid resin, by: forming conformity = wrong by the reactive ion side only removed in the recess first: The S3 is thereby used to diffuse the Si into the magnetic layer, and the surface of the light-emitting S1 is used, and the magnetic property of the symmetry is the same as that of the adjacent track. 6 5 ΊΟ is the coating layer produced by this method === The thickness of the Si film used is shown in Table 1 below and Comparative Examples 3 and 4 are used: 15 200814007 According to the use of the examples 1 to 10 The same procedure but omitting the force of the deposited Si package, the σ heat and the riding of the bundle of the material, the thickness of the Si film measured in the product is 50 Λ and 3 〇〇 A, respectively. Use ‘spin stand to evaluate examples! Electromagnetic conversion characteristics of samples to 1〇 and compared. In this evaluation, the vertical 呓2 to 4 are recorded and read using the iwR read/write head. For the recorded 750 S oral per value and 3T-s to h (_. I found that compared to the comparative example = 'shell 1 to 10 samples, the RW characteristics such as SNR and 3T as 7 improved. This means : (4) from the stable reading U = can be Rw under the floating height of the pattern. Because the confirmation ^ i 3T_squash' _ also confirm the instance illusion. The sample can be separated by the non-magnetic 7 knife And it is realized by the diffusion of Si, and in the example, the magnetic pattern including the magnetic portion and the non-magnetic portion is formed, and the shape of the resist pattern of the magnetic unevenness is matched. On the other hand, "Two samples ΐ ΐ ΐ ΐ 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 In the examples and comparative examples, the thick chain of the non-magnetic substrate of the body 256 fabricated is evaluated for the use condition (four) and the scanning rate of 1 (four) seconds. The structure of the δ flat evaluation is shown in Table 1 below. And the sample of 2, the example 丄 to 忉 ΐ Ϊ Ϊ 极 极 极 极 极 极 极 极 极 极 极 极 极 极Note: This improvement allows the reading and writing of the samples of Figures 1 to 10 and Comparative Examples i to 4 to be carried out in the SGny/Tektrenix heart-made απ代马 DS4100" for sale and slippage The head (s version head) is written. The evaluation results are ‘ /, in the table below. Non-hanging: Examples 1 to 1 are superior to Comparative Examples 1 and 2 in the high-gap avalanche of 16 200814007. A comparison of Examples 1 to 10 with Comparative Examples 1 to 4 is clearly shown: * The present invention easily manufactures a discrete ship, and by making the Si-containing alloy shaft in a non-missing portion, the medium exhibits a sufficiently low Surface roughness, and produced stability = head floating. As is clear from the examples and comparative examples, the fabrication performed in this manner which reduces the surface roughness has formed an important factor for achieving the purpose of stabilizing the head floating. The present invention preferably fixes the surface roughness to Ra^ 2 nm 'and more preferably 1.5 legs. It is highly apparent that the present invention is a device having separate patterned non-magnetic and magnetic layers and is more capable of fabricating patterned media that achieve higher recording densities than discrete methods.

Table 1

Si film thickness (nm) Heating temperature (Examples 1 to 5) Ion beam Ar acceleration V / roll time SNR (dB) 3T- squash Ra (nm) Mountain, by - 1 &gt; 昼 度 instance 1 10 200 ° C No 11.9 80.3 0.4 6.0 Example 2 100 200 °C No 123 83.2 0.4 5.3 Example 3 500 200 °C No 12.7 85.7 0.6 6.2 Example 4 500 100 °c No 13.6 87.3 0.7 6.9 Example 5 1000 200 °C No 12.0 ^ 89.2 0· 8 7.0 Example 6 10 Benefits $ 500 eV/120 seconds 12.1 82.2 0.3 5.5 Example 7 100 500 eV/120 seconds 12.6 83.3 0.8 6.9 Example 8 500 500 eV/120 seconds 12.9 83.2 〇·7 6.1 Example 9 500 1000 eV/120 Seconds 12.1 76.8 0.8 5.9 Example 10 1000 No 500 eVA 20 seconds 12.1 78.5 0.5 5.5 Comparative Example 1 None 6.5 54.3 10.0 13.4 K Comparative Example 2 Benefit 10.1 67.9 2.8 10.0 Comparative Example 3 10 ^\\\ No 9.1 66.8 0.5 6.1 Comparative Example 4 500 Qin 9.7 69.3 0.4 5.8 17 200814007 Industrial Applicability························································································· Excellent ^^目_The news between the roads omits the magnetic Processing the magnetic layer f dry. Moreover, the manufacturing rate of the magnetic recording medium has been increased locally. X 7, so it is greatly improved because of the excellent ability of the excellent read/write head floating body to clearly show the separation and the influence of the interference of the recording medium signal. Magnetic recording and reproducing device between the channels. </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; Fig. 2 is a structural explanatory view of the magnetic recording and reproducing apparatus of the present invention. [Description of main component symbols] 2 4 1 · Non-magnetic substrate soft magnetic layer and intermediate layer magnetic layer Non-magnetized layer 5: Protective film layer 26: Magnetic drive unit 27: Magnetic head 28 • Item head drive unit 29: Recording and Regenerative signal system 30: magnetic recording medium 18

Claims (1)

200814007 X. Patent application scope: 1. A discrete-type magnetic recording medium comprising: a non-magnetic substrate; a magnetic recording track and a servo signal pattern disposed on at least one side of the non-magnetic substrate; and a non-magnetic The non-magnetic portion of the Si-containing alloy physically separates the magnetic recording track and the servo signal pattern. 2. The discrete-type magnetic recording medium of claim 1, wherein the substrate has a surface roughness Ra satisfying 0·1 nmgRO. Onm. ', soil 2, such as the discretionary patent range of 1 or 2 discrete disc-type magnetic recording media, the magnetic recording track is a vertical magnetic recording track. /, Lrff silk lion sacred ship's yarn making method, _ _ _ _ _ _ 至少 至少 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该Forming a Si film on the magnetic layer; irradiating the magnetic layer or irradiating the surface of the Si film with an inert ion to cause Si ϊΐ ΐ ΐ ΐ 借此 借此 借此 在 在 在 在 在 在 在 在 在 脑 脑 脑 脑 脑 脑 脑 脑 脑 脑 脑 脑 脑 脑 脑 脑 脑 脑 脑• The non-magnetic part of the non-magnetic &amp; alloy of the signal pattern. 5. A magnetic 5 recording and reproducing device comprising the following combinations: the discrete track of the recording medium patent item 1 to 3 is used to drive the magnetic recording medium in the recording direction; magnetic 11. Head, consisting of #已录部和再生部; and actuating the clothes, so that the sexual items are written relative to the magnetic recording medium; 19 200814007 Recording and reproducing signal processing device, so that the signal enters the magnetic reading and writing The head reproduces the output signal from the magnetic head. XI. Schema: 20