Abstract: A very thin abrasive material on a substrate is comprised of ceramic particulates contained within a metal matrix. The particulates extend fully through the matrix from the substrate surface to the machined free surface of the abrasive. In a representative 0.38 mm abrasive the particulates are sized normally at 0.42-0.50 mm and have an aspect ratio of less than 1.9 to 1. This enables a high density of particulates, in the range 33-62 per cm.sup.2, while at the same time ensuring good bonding in that most of the particulates are fully surrounded by matrix. When the abrasive is applied to the tip of a superalloy gas turbine engine blade, about 10-50% of the matrix metal is removed after machining. This allows the machined ceramic particulates to project into space and to thus better interact with ceramic abradable seals. In the preferred practice of the invention the particulates are alumina coated silicon carbide contained in a nickel superalloy matrix.

Abstract: A perpendicular magnetic recording medium according to this invention comprises an electrically conductive underlayer formed on a non-magnetic substrate, in the case where no high permeability magnetic film is deposited, and a magnetic thin film having a perpendicular magnetic anisotrophy is formed thereon. In the case of a so-called double-layer structure including a high permeablilty magnetic film, on the non-magnetic substrate are formed the high permeablilty magnetic film, an intermediate film, and a magnetic thin film one on another in this order. The nearest neighbor's distance of atoms of the underlayer and the intermediate film is not smaller than 0.25 nm (2.5 .ANG.) and not greater than 0.32 nm (3.2 .ANG.) and they are made of at least one selected from the group consisting of V, Ru, Zn, Os, Rh, Ir, Mo, W, Re, Pd, Pt, Nb, Ta, Sn, Al, Au, Ag, Ti, nitrides and oxides of these elements.

Abstract: Disclosed herein is a magneto-optical medium comprising a magnetic layer, a protective layer of a complex oxide containing oxides of aluminum and a base plate.

Abstract: A magnetic recording medium comprising a substrate, a magnetic recording layer made of an amorphous magnetic film on the substrate, and an anticorrosive layer prepared by oxidation treatment of the surface of the amorphous magnetic film.

Abstract: In a magneto-optical recording medium comprising a perpendicular magnetizable thin film layer formed from an amorphous rare earth metal-transition metal alloy on a substrate with or without an intermediate layer, and a first protective layer formed from a plasma-polymerized film on the magnetizable layer; a second protective layer is formed on the first protective layer by curing a radiation-curable compound coating and/or an undercoat layer of a plasma-polymerized film is formed on the substrate in order to improve the moisture proofness of the magnetic layer. The substrate may be plasma treated to improve adherence. Covering the overall outside surface of the medium with a cured film of a radiation-curable compound ensures best shelf stability.

Abstract: Disclosed is a magnetic recording medium in which an underlayer formed below a magnetic medium, in which a signal is written, is composed of a nickel alloy comprising 0.05 to 10 atom % of tungsten and 14 to 30 atom % of phosphorus. In this magnetic recording medium, the temperature for formation of magnetic medium and the temperature for formation of a protective film can be elevated over the levels adopted in the conventional techniques. Therefore, the magnetic characteristics and abrasion resistance can be improved. Furthermore, the magnetic recording medium is excellent in the mechanical strength and corrosion resistance. Accordingly, the reliability of the magnetic medium can be highly improved.

Abstract: The improved memory disk of the present invention comprises a substrate coated with chromium with preferably a layer of cobalt/nickel as the magnetic layer sealed with a protective coating of carbon. As a result of circumferential texturing, a circular anisotropic crystal growth has occurred during the sputtering with a circumferential alignment that provides an improved memory disk having a reduced amplitude modulation, an improved squareness of the hysteresis loop, e.g. lower switching field distribution and a high production relatively low cost production system. As a result, a higher recording linear bit density due to the high coercivity and low switching field distribution can be experienced with the magnetic disk of the present invention.

Abstract: This specification discloses a magneto-optical recording medium having an amorphous magnetic alloy film comprising the following composition and having a readily magnetizable axis in a direction perpendicular to the surface of the film:{(Gd.sub.x Tb.sub.1-x).sub.p (Fe.sub.y Co.sub.1-y).sub.1-p }.sub.q (Ni.sub.z Cr.sub.1-z).sub.1-q,where0.ltoreq.x.ltoreq.0.90.2.ltoreq.y.ltoreq.1.00.05.ltoreq.z.ltoreq.1.00.1.ltoreq.p.ltoreq.0.50.001.ltoreq.1-q.ltoreq.0.35.

Abstract: A magneto-optical element comprises a magnetic garnet layer on a crystalline substrate. The garnet layer has a faceted structure, which provides high Faraday rotation and controlled coercivity. The faceted structure is preferably formed by depositing the layer onto a substrate whose lattice constant is sufficiently smaller than that of the layer. The resulting elements find application in light modulators, such as switches and displays, where they permit high resolution without having to be cut into an array of small cells.

Abstract: A vertical magnetic recording medium comprising a substrate and a magnetic layer formed on the substrate and having a magnetic anisotropy in the direction vertical to the surface of the substrate is described. The magnetic layer is composed substantially of a metal selected from cobalt and/or iron, and an oxide of the metal. The metal and metal oxide consist of columnar structures oriented in the direction vertical to the surface of the substrate and spaced from one another through fine voids throughout the magnetic layer. The columnar structures have a diameter of 100 to 1000 .ANG. and the magnetic layer have a void ratio of to 56%.

Abstract: An optical information record medium comprising a transparent substrate, an optical information recording layer, and a reflective metal layer. The reflective metal layer is formed of an aluminum-titanium alloy in which the titanium content is between 0.1 and 10 weight %. The medium has improved stability against corrosion due to the improved reflective metal layer.

Abstract: A magnetic medium in which the non-magnetic layer comprises nickel-copper-phosphorus film containing 20 to 65 wt % of copper, in which layer is formed by electroless plating. The non-magnetic layer does not become magnetic even after heat treatment at 200.degree. C. or above.

Abstract: A magneto optical thin film recording medium is disclosed having very high carrier-to-noise ratios and high rotation angles. A transmission electron microscope photomicrograph (at 200,000.times.) of one such medium is shown in FIG. 1. These are multi-phase amorphous materials having magnetic anisotropy perpendicular to the plane of the thin film. They are produced in a triode vacuum sputtering process at vacuums in the range of 4.times.10.sup.-3 to 6.times.10.sup.-4 Torr. By adjusting process parameters such as substrate temperature, anode bias and deposition rate, the properties of the thin film can be altered.

Abstract: Disclosed herein is a novel magneto-optical recording element comprising an alloy thin film of aluminum and nitrogen, such film being contiguous with a magneto-optic recording layer. The Al.sub.1-x -N.sub.x alloy is distinct from the stoichiometric AlN compound used in prior art in that it is substantially amorphous in character. The amorphous character of this alloy film gives rise to a substantially enhanced (8.times.) magneto-optic effect, as well as excellent corrosion resistance. Also disclosed is a reactive sputtering method for producing such amorphous aluminum-nitrogen alloy films.

Abstract: A magneto-optic memory element includes a GdTbFe recording layer sandwiched between a pair of transparent AlN dielectric layers. At least one of the pair of transparent AlN dielectric layers is extended to have a size larger than the GdTbFe recording layer so as to cover the peripheral edge of the GdTbFe recording layer, thereby protecting the GdTbFe recording layer from oxygen and moisture. An Al-Ni alloy reflection film is formed on one of the pair of transparent AlN dielectric layers in order to increase the apparent Kerr rotation angle produced by the magneto-optic memory element.

Abstract: A magnetic head for a magnetic recording and playback device. The head comprises a Mn-Zn-ferrous ferrite core having a very high saturation magnetization and magnetic permeability. The Mn-Zn-ferrous-ferrite has a composition according to the formulaMn.sub.a Zn.sub.b Fe.sub.c.sup.II Co.sbsb.xFe.sub.2.sup.III O.sbsb.4with0<a.ltoreq.0.550.06.ltoreq.b.ltoreq.0.40.34.ltoreq.c.ltoreq.0.90.0006.ltoreq.x.ltoreq.0.006.

Abstract: A magnetooptical storage element having a recording layer of a multi-layer construction including a reflective layer. The reflective layer is made of an aluminium-nickel alloy obtained by adding nickel to aluminium such that the aluminium-nickel alloy contains approximately 2 to 10 atomic percent of nickel.

Abstract: In forming a vertical magnetization type recording medium, a first soft magnetic film layer is formed on each side of a film-shaped support by vacuum deposition or sputtering at a temperature of 30.degree. C. or lower, a second soft magnetic film layer is formed on each of the first soft magnetic film layers, and a vertical magnetization film layer essentially containing Co-Cr is formed on each of the second soft magnetic film layers. The thickness of the first soft magnetic film layer on one side of the support may be made different from that of the first soft magnetic film layer on the other side so that curling of the recording medium is substantially eliminated.

Abstract: An information recording disk has a transparent support substrate and a transfer layer formed thereon using a stamper. The transfer layer comprises a precursor having as major components a cycloacetal compound having at least two polymerizable unsaturated groups, a compound having at least two mercapto groups, and an acrylic ester and/or methacrylic ester.

Abstract: A magnetic medium for horizontal magnetization recording which comprises a non-magnetic substrate and a magnetic recording film formed on at least one side of the substrate, is described. The magnetic recording film consists essentially of an amorphous Co-Cr alloy containing from 5 to 15 atomic percent of oxygen atoms. A method for making the above type of medium is also described in which the magnetic film is vapor deposited under conditions of a partial pressure of oxygen gas of 1.times.10.sup.-3 to 3.times.10.sup.-3 Torr., and a sputtering rate of from 0.05 to 0.15 .mu.m/minute.