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公开(公告)号：DE69020992D1
公开(公告)日：1995-08-24
申请号：DE69020992
申请日：1990-09-17
Applicant: IBM
Inventor： KATO YOSHIMINE , SHIMIZU TERUHISA , TAKAYAMA SHINJI , TANAKA HIROSHI
IPC: G11B11/10 , G11B11/105 , G11B7/24
Abstract: A magneto-optical recording medium is provided which has high magneto-optic effect even under a short-wavelength light, high anisotropy in the direction perpendicular to the film surface, and permits high-density recording, the medium having a first magnetic layer laminated onto a second magnetic layer, the first magnetic layer being a rare-earth-transition-metal amorphous film with mainly a light rare-earth element as rare-earth element, the light rare-earth element being at least one element selected from an element group consisting of Nd and Pr, and the second magnetic layer being a rare-earth-transition-metal amorphous film with at least one element selected from an element group consisting of Tb and Dy as rare-earth element.
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公开(公告)号：CA2051603A1
公开(公告)日：1992-04-06
申请号：CA2051603
申请日：1991-09-17
Applicant: IBM
Inventor： IIYORI HIDEO , TAKAYAMA SHINJI
Abstract: A magneto-optical medium (1) comprises first, second and third layers. The first layer has a thickness of not less than 1 nm and not more than 20 nm and is in the form of a rare earth-transition metal amorphous film including at least one rare earth element selected from a group consisting of Tb, Dy, and Gd and including at least one transition metal element selected from a group consisting of Fe and Co. The lecond layer (2) has a thickness of not less than 1 nm and not more than 20 nm and is in the form of either a rare earth-transition metal amorphous film including at least one rare earth element selected from a group consisting of ND and Pr and including at least one transition metal element selected from a group consisting of Fe and Co, or a crystalline film including at least one element selected from a group consisting of Fe and Co. The third layer (3) has a thickness of not less than 2 nm and is in the form of a rare earth-transition metal amorphous film including at least one rare earth element selected from a group consisting of Tb, Dy, and Gd and including at least one transition metal element selected from a group consisting of Fe and Co. The layers are laminated suceessively, with the second layer disposed between the first and third layers and with the first layer being the first to be penetrated by light. The medium has an advantageously large magneto-optical effect even at short wavelengths, reorients the magnetization in a direction perpendicular to the film surface, and permits high-density recording.
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公开(公告)号：JPH0573880A
公开(公告)日：1993-03-26
申请号：JP25417991
申请日：1991-09-06
Applicant: IBM
Inventor： SHIMIZU TERUHISA , TAKAYAMA SHINJI
Abstract: PURPOSE: To provide a magnetic recording medium which is low in medium noise, has high coercive force and is adequate for longitudinal recording. CONSTITUTION: The magnetic recording medium includes a substrate 1 and a magnetic layer 2 formed on this substrate 1. The magnetic layer 2 is constituted by mixing a magnetic material which is any of a Co system, Fe system and FeCO system and at least one kind of nonmagnetic compds. which are selected from a group consisting of oxide and nitride. The ratio of the volume of the nonmagnetic compd. occupying the entire volume of the magnetic material and the nonmagnetic materials to be mixed is preferably about >=2 about
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公开(公告)号：JPH03269847A
公开(公告)日：1991-12-02
申请号：JP5824990
申请日：1990-03-12
Applicant: IBM
Inventor： TAKAYAMA SHINJI
IPC: G11B11/105 , G11B11/10
Abstract: PURPOSE: To obtain a magneto-optical recording medium having an excellent magneto-optical effect while contg. many nonmagnetic corrosion resistance improving elements by using a specific compsn. material. CONSTITUTION: The highly corrosion resistant magneto-optical recording medium which is enhanced in the magneto-optical effect even if the medium contains the many nonmagnetic corrosion resistance improving elements is obtd. if the materials expressed by the compsn. formula shown by formula I are used. In the formula, RE: >=1 kinds of the elements selected from an element group consisting of Tb, Dy, Cd, Nd, Pr, T: Ti, >=1 kinds of the elements selected from an element group consisting of Ti, Nb, Ta, Cr, a to d: the values satisfying the conditions of formula II.
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公开(公告)号：JPH08250494A
公开(公告)日：1996-09-27
申请号：JP4886195
申请日：1995-03-08
Applicant: IBM JAPAN
Inventor： TAKAYAMA SHINJI
IPC: H01L23/52 , G02F1/1343 , G02F1/1362 , H01L21/3205 , H01L21/336 , H01L23/532 , H01L29/49 , H01L29/786
Abstract: PURPOSE: To provide a wiring material which has an extremely low electric resistance and is free from such defects as hillocks, pinholes, etc., even when the material is heated to a high temperature and with which a solid oxide film can be formed by using the anodic oxidation method. CONSTITUTION: An alloy having a composition expressed by Alx (My N1-y )1-x , where M and N respectively represent at least one element selected from the group of rare-earth elements and at least one element selected from among Nb, Zr, and Ta and (x) and (y) respectively represent 98-99.5at.% and 0.1-0.9at.%, is used as a wiring material so that, when the alloy is heat-treated, an intermetallic compound of Al and the element represented by N or M can deposit in the matrix. The purpose can be accomplished even when an alloy to which Nb is added at a rate of 0.5-2.0at.% against Al is used. It is preferable to control the heat-treating temperature within the range of 250-450 deg.C.
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Patent Agency Ranking
公开(公告)号：JPH04150010A
公开(公告)日：1992-05-22
申请号：JP26660690
申请日：1990-10-05
Applicant: IBM
Inventor： IIYORI HIDEO , TAKAYAMA SHINJI
Abstract: PURPOSE: To enable high-density recording while enlarging a magneto-optical effect, even on the short wavelength side and inducing magnetization vertically with respect to a film surface by sequentially laminating 1st, 2nd and 3rd magnetic layers of rare earth element-transition metal non-crystal film, having prescribed thickness from the light incident side. CONSTITUTION: 1st, 2nd and 3rd magnetic layers 1, 2 and 3 of rare earth element-transition metal non-crystal film are sequentially formed on a glass substrate 4. At such a time, the thickness of 1st and 2nd layers 1 and 2 is 1-20nm, the thickness of the 3rd layer 3 is 2nm or more. Further, the 2nd layer is expressed by the composition formula of (A1-a Ba )x (Fe1-b Cob )y Tz . Here, A is an element at least selected from among an element group composed of Nd and Gd, B is an element selected from among an element group composed of Tb, Dy and Gd, T is an element at least selected from among a transition metal element group for improving corrosion resistance, and the conditions of 0
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公开(公告)号：JPH03127347A
公开(公告)日：1991-05-30
申请号：JP26530889
申请日：1989-10-13
Applicant: IBM
Inventor： TAKAYAMA SHINJI
IPC: G11B11/10 , G11B11/105
Abstract: PURPOSE: To make it possible to truly execute overwriting by combining a recording medium consisting of a rare earth-transition metal RE-TM film of a single layer and an optical modulation system using a single beam source. CONSTITUTION: The irradiation with a laser level at a first power level is executed. Since an auxiliary magnetic field Hex for executing writing is weak, magnetization is inverted by the diamagnetic field created by the sufficiently large magnetization of the ambient and its own magnetization at the heated spot. The film with which the erasing is executed by irradiation with the laser beam L of the second power level larger than the first power level is heated up to the temp. near the Curie point or higher than this point and, therefore, the auxiliary magnetic field Hex, though weak, acts to reinvert the magnetization. The true execution of the overwriting is made possible by combining the recording medium consisting of the RE-TM film of the single layer and the optical modulation system using the single laser beam source.
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公开(公告)号：JPH08306693A
公开(公告)日：1996-11-22
申请号：JP21056095
申请日：1995-08-18
Applicant: IBM JAPAN
Inventor： TAKAYAMA SHINJI
IPC: G02F1/1345 , H01L21/3205 , H01L23/52
Abstract: PURPOSE: To provide a very low-electric resistance wiring material, which has stability to high heat and has few defects, such as a hillock, by a method wherein when a material containing rare-earth metals is heat-treated to Al, the kinds of the rare-earth metals, the addition amount of the rare-earth metals and a heat treatment temperature are specified. CONSTITUTION: An electrode wiring material for a liquid crystal display array is used for a gate conductor 3, a gate electrode 3A, a data line 4, a drain electrode 4A and a source electrode 5 and when a potential in the data line 4 becomes equal with that in a pixel electrode 2, which is connected with the data line 4 via the source element 5, a liquid crystal encapsulated in the upper part in the paper surface direction of the electrode 2 is orientated and the pixels of the liquid crystal are put in a state that they are displayed. For such the wiring material, a material obtainable by a method, wherein one rare-earth metal or more rare-earth metals selected from among Y, La, Nd, Gd and Dy of the total amount of 0.1 to 3.0 atomic % is or are added to Al and thereafter, an intermetallic compound consisting of the Al and the rare-earth metal or the rare-earth metals is made to precipitate in a matrix by a heat treatment of 250 to 450 deg.C, is used.
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公开(公告)号：JPH03108144A
公开(公告)日：1991-05-08
申请号：JP24242289
申请日：1989-09-20
Applicant: IBM
Inventor： KATOU YOSHIMINE , SHIMIZU TERUHISA , TAKAYAMA SHINJI , TANAKA HIROSHI
IPC: G11B11/10 , G11B11/105
Abstract: PURPOSE: To attain high-density recording by laminating at least one layer each of a first magnetic layer and second magnetic layer consisting of rare earth-transition metal amorphous films on a substrate and increasing the intensity of the magnetic anisotropy in the direction perpendicular to the film plane. CONSTITUTION: This magneto-optical recording medium is formed by laminating at least one layer each of the first magnetic layer 1 and second magnetic layer 2 consisting of the rare earthtransition metal amorphous films on the substrate 3. The magnetic layer 1 is the one element selected from an element group consisting of Nd and Pr. The magnetic layer 2 contains only one element selected from an element group consisting of Tb and Dyb. The magnetic layer 1 has a high magneto-optical effect at a short wavelength and small perpendicular magnetic anisotropy. The magnetic layer is conversely small in the magnet optical effect and large in the perpendicular magnetic anisotropy. When the magnetic layers 1, 2 are laminated, the magnetic interlayer bonding effect generated between the two layers is exerted on the magnetic layer 1. The medium of the perpendicularly magnetized films having the high magneto-optical effect even at a short wavelength over the entire part of the laminated layers is then obtd. and high-density recording is made possible.
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