TW498321B - A recording method for optical super-resolution writing and magnetic flux detection - Google Patents

Abstract

A recording method including a read/write optical assembly super-resolution near-field optical writing and magnetic flux reading is invented. The multi-layer structure of disk and drive-component assembly for this recording method is disclosed. Super-resolution near-field optical writing can shrink the size of the recording spot substantially. The GMR (giant magneto-resistive) or TMR (tunneling magneto-resistive) device has the advantage of high-resolution for sensing magnetic flux. Taking advantage of both method, a new high-density data recording system, which consists of super-resolution near-field optical writing and magnetic flux detection, can be developed. Thus, the recording density can be increased to 100 GB/inch<SP>2</SP> or higher by using the blue laser light.

Description

498321 ν ',---- Case No. 89121675 _ ¥ Yue Yue 绦 4_ V. Description of the Invention (1) Field of the Invention: The present invention relates to a recording medium for optical writing and magnetic reading, and in particular to a method for writing by optical super-resolution Film structure and recording method for magnetic flux detection and reading. ° Known technology: Higher recording density is the development trend of storage media. As the recording density continues to increase, the recording mark will become smaller and smaller. The optical recording body is limited by the size of the light spot. The emission limit cannot be reduced indefinitely, because the recording trace signal smaller than the light spot cannot be detected, and thus the improvement of the recording density is limited. In order to overcome the bottleneck of the diffraction limit, technologies such as Near-field Scanning Microscope and Optical Super-Resolution Near-Fieid Structure were successively proposed to be applied to optical recording media. Although the magnetic recording media has increased the recording density at a speed of 60% or even 100% in recent years, the increase in the recording density will also be limited by the superparamagnetic limit (1 param) and reach saturation. In order to break the superparamagnetic limit of magnetic recording media, Hitachi Corporation in 1998 produced a technology that combined the thermo-magnetic writing and magnetic flux detection methods of magneto-optical disks and hard disks · technology, namely recording Songzu, ,, The material is a magneto-optical material. The traditional magneto-optical writing method is used to record signals, and the giant magnetoresistance (GMR: Magnetoresistance) thin-film magnetic head is used to measure the magnetic flux to read the signal. The smallest I 4 magic is written in the current magneto-optical system. The flood bluff was 0.53 // m, and the recording density was 8.36 Gbi t / in2. In order to obtain a higher recording density, Guo Bo from the National Taiwan University; Professor Cheng and others added the technology that breaks through the diffraction limit and proposed that the solid-state immersion

Page 5 498321 V. Description of the invention (2) The combination of SIL (Solid Immersion Lens) and giant magnetoresistive film ▲ head (GMR) technology. This technology uses a solid-state immersion lens to obtain a light spot smaller than the diffraction limit for writing. Smaller recording trace signals are used to increase the recording density, and even solid-state immersion lenses, magnetic coils, and giant magnetoresistive film magnetic heads are designed on the same aircraft (Sider). The disadvantage of this method is that the objective lens of the optical head must fly on the disc at a height less than the laser wavelength (about 1000 ~ 150 nm) to produce a near-field (near fie 1 d) effect, which will increase Complexity of CD Feeding System Design. In addition, the solid-state immersion lens, magnetic coil, and giant magnetoresistive thin-film magnetic head are all designed on the same aircraft (SI ider). The entire aircraft will be too heavy to control the precise flight height. Summary of the invention: The object of the present invention is to provide a magnetic sheet film structure and recording method using optical super-resolution writing and magnetic flux reading, combined with optical super-resolution near-field structure and giant magnetism GMR and even truncated magnetoresistive head (TMR: Tunneling) technology to break the optical diffraction limit and superparamagnetic limit to increase the recording density of magneto-optical discs. This technology only requires an additional layer of shielding on the magneto-optical discs. A mask layer and an interface iayer can achieve the near-field optical writing effect, eliminating the disadvantage of designing the near-field optical mechanism on a SI ider to increase its difficulty. In order to achieve the above and other objectives of the present invention, the present invention proposes a disc film layer structure using optical i super-analytic writing and magnetic flux detection readout, including a substrate; a first protective layer formed on the substrate A masking layer is formed on the first protective layer; an intermediate layer is formed on the masking layer 0178-5708TW.ptd page 5

V. Description of the invention (3); a recording layer formed on the intermediate layer; one on the recording layer i; and a turbid slip layer formed on the present protective layer to form another use of optics of the present invention; brother -On the protective layer. Read ΐΐ: square *, including:-film structure, measure the first protective layer, a masking layer, a substrate, a protective layer and a lubricating layer in order according to d; a light wind a 3, A recording layer, a second protection, and a magnetic coil are located at the film layer = end at the substrate end; and a read head is provided for the purpose of making the present invention obvious and easy to understand, and other purposes, features, and advantages are enumerated below_2 Can be more ancient as follows. In addition, the examples and the accompanying diagrams are used to explain the detailed drawings briefly: Figure 1 shows the date from the day to the day. Schematic diagram of the disc film layer structure of the x-month embodiment. Figure 2 shows the prince symbol. Explanation: * A schematic diagram of the recording method of the month embodiment. I 0 ~ substrate; 30 ~ mask layer; 50 ~ recording layer; 70 ~ second protective layer; 90 ~ magnetization direction; II 0 ~ laser spot size 1 3 0 ~ magnetic coil; 150 ~ lens ; 1 70 ~ signal trace. Engage: 2 0 ~ first protective layer; 40 ~ intermediate layer 6 0 ~ reading layer 80 ~ lubricating layer 1 0 ~ reading head; 1 2 0 ~ aperture opening of the mask layer; 1 4 0 ~ aircraft 16 0 ～ Laser light 0178-5708TW.ptd Page 6 498321 V. Description of the invention (4) Preferred embodiments: The present invention mainly uses optical super-resolution and magnetic flux chirp technology to break the optical diffraction limit and The paramagnetic limit is limited to increase the recording density of the recording medium. In the embodiment of the present invention, the manufacturing process of the film layer using optical super-analytic writing and magnetic flux # measurement readout is as follows. The preparation of the process begins with the preparation of a substrate 10, which may be glass or polycarbonate, followed by A first-protective layer 20 is formed on the substrate 10 by sputtering. After that, the first protective layer 20 is demineralized to form a mask layer 30. Then on the mask layer 30, an interface layer 40 &gt; e (rec〇rding readout layer 60 (optional), a second protective layer 70, and spin coating to form a lubricating layer ( iubricant layer) 8. The material of the first protective layer 20, the second protective layer 70, and the intermediate layer 40 may be silicon nitride 1 (: iN), and the material of the masking layer 30 may be antimony or silver oxide. Material of recording layer 50 = alloy of rhenium, iron, and cobalt (TbFeC〇), material of reading layer 60, alloy of rhenium, rhenium, iron, and cobalt (DyTbFeC〇), protective layer 80 It is formed by spin coating. The structure of this film is shown in Figure 1. 9

In the present invention, a magneto-optical disc is used as a recording medium, and the recording method is as shown in FIG. 2 :: The magnetization direction of the material of the virtual recording layer 50 is 90% perpendicular to the surface to increase the "recording degree" and the reading layer 60 is a magnetic flux The enlarged reading layer facilitates the signal reading of the reading head, and a shell mask layer 30 is added between the recording layer 50 and the substrate 10. The mask layer 30 can be opened under the irradiation of laser light 16 Small ^ Aperture 120 of the laser light spot 110 reduces the size of the laser light spot and enters smaller signal traces 170. The reading head 100 of the present invention is combined with a coil

Page 7 0178-5708TW.ptd 498321 V. Description of the invention (5); (magnetic coil) 130 is designed on the forged film side. The magnetic coil WO and the reading head 100 are located on the same aircraft 140, and the reading head 100 may It is a magnetoresistive thin film magnetic head (MR), a giant magnetoresistive thin film magnetic head (GMR) or a puncture magnetoresistive thin film magnetic head (TMR). The optical head is designed on the side of the substrate. The reference number 15 is a lens. The wavelength of the laser light 160 may be red light (650 nm) or blue light. Although the present invention has been disclosed in the preferred embodiment as above, the present invention is limited by the iron. Anyone skilled in this art can use it within the range. When it can be changed slightly, it will not deviate from the spirit of the present invention. Attached to the patent application park = the protection of the present invention

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0178-5708TW.ptd $ 8 pages

Claims (1)

498321 6. Scope of patent application 1 · A kind of disc using optical super-analytic writing and magnetic flux detection and reading · The film structure includes: A cymbal is a substrate; a compliance layer is formed on the substrate; is formed on the first protective layer; is formed on the mask layer; is formed on the intermediate layer; a protective layer is formed on the substrate; On the recording layer; and on the second protective layer. The film structure described in item 1 of the patent scope forms a reading layer. The film structure described in item 1 of the patent scope, polycarbonate. The film structure of the disc described in item 1 of the patent scope, wherein the material of the second protective layer and the intermediate layer is the structure of the film layer of the disc described in item 1 of the patent scope, where the material is recorded or oxidized silver. The film structure of the disc described in the first item of the patent scope, wherein the material is an alloy of rhenium, iron, and cobalt. h The disc film layer structure described in item 1 of patent fe, wherein the material is an alloy of rhenium, rhenium, iron, and cobalt. / Recording with optical super-resolution writing and magnetic flux detection-a first protective layer, a mask layer, an intermediate layer, a recording layer, a second protective layer, and a lubricating layer are further included. 3. If the application board is made of glass or 4. If the first protective layer is applied. 05. If the material of the cover layer is applied. 6. If the material of the recording layer is applied. 7. If the material of the reading layer is applied.材 8.-Various profit methods, including: 'Patent application scope layer-film layer structure, in order: one, one intermediate layer, one recording layer, four layers, and one mask-optical head is located at the substrate end; = protective layer and-lubricating layer;-: coil Located at the end of the membrane layer. It further includes the method described in item 8 of the film, wherein the substrate is the one in which the first protective surname is Liganwei, and a reading layer is formed on the recording layer of the layer structure. 10. * The method described in item 8 of the application is glass or polycarbonate. The method described in item 8 of the protective layer, wherein 12: the material of the middle layer is silicon nitride 12. The material covered by Shen Qing's patent is antimony or silver oxide. Page t method, wherein the mask layer, the recording layer, the reading layer, the reading head, and the reading head! The method described in item 8 of the scope of patent application: Heartwood, iron, and Cobalt alloy. The material gas is the alloy of rhenium, thorium, iron, and cobalt as described in the method described in item 8 of the scope of patent application. lj. If the party applying for the scope of the patent is located on the same side as the magnetic coil, the method described by "2 :: 2 Li Fan Fan Ju Wai" is used in the read head. 4 film magnetic head, giant and thin Erase head or super giant magnetoresistive film head