Abstract: A motor in which an attracting magnet for attraction between a rotor and a stator is used in the present invention. The attracting magnet is formed into a hollow cylindrical shape such as to have two flat surfaces between which a predetermined thickness is defined. The attracting magnet is magnetized so as to have different polarities at the inner and outer circumference sides divided in the radial direction in each of its two flat surfaces, and to be reversed in polarity in an interchanging manner between its two flat surfaces. The attracting magnet is mounted on an inner surface of a rotor case while being opposed to a bearing housing. In this motor using the attracting magnet arrangement, the shaft is not magnetized even though the attracting magnet for attraction of the rotor toward the stator is used.

Abstract: An apparatus for manufacturing a magnetic recording disk includes a magnetic-film deposition chamber in which a magnetic film for a recording layer is deposited on a substrate; a lubricant-layer preparation chamber in which a lubricant layer is prepared on the substrate in vacuum; and a cleaning chamber in which the substrate is cleaned in vacuum after the magnetic-film deposition in the magnetic-film chamber and before the lubricant-layer preparation in the lubricant-layer chamber. The apparatus may further include a transfer system that transfers the substrate from the cleaning chamber to the lubricant-layer preparation chamber without exposing the substrate to the atmosphere.

Abstract: In manufacturing a magnetic recording disk, a magnetic film for a recording layer is deposited on a substrate of the magnetic recording disk in a magnetic-film deposition chamber, and the substrate is transferred from the magnetic-film deposition chamber to a lubricant-layer preparation chamber without exposing the substrate to the atmosphere. Then, a lubricant layer is prepared on the substrate in the lubricant-layer preparation chamber.

Abstract: This application discloses a system for depositing a magnetic film for a magnetic recording layer or depositing an underlying film prior to depositing a magnetic film as a recording layer. The system comprises; a chamber in which the film is deposited onto a substrate by sputtering, a target that is provided in the chamber and made of material of the film to be deposited, a sputter power source for applying voltage to the target for the sputtering, and a direction control member for controlling sputter-particles released from the target during the sputtering. The direction control member is provided between the substrate and the target. The direction control member provides a passage for the sputter-particles. The direction control member lets the sputter-particles selectively pass through, thereby allowing magnetic anisotropy to the magnetic film. The passage is not close but open in its cross section.

Abstract: This application discloses a multi-layer film deposition apparatus comprising; plural cathodes comprising targets respectively, a main rotation mechanism for rotating each cathode together, and a substrate holder to hold a substrate onto which a multi-layer film is deposited by sputtering. The targets are arranged at positions where their center axes are on a circumference. The main rotation mechanism rotates the cathodes around the axis in common to the circumference. The substrate is located at a position within an area in view to the direction of the axis. The area is formed of two loci of points on the rotated targets. One of the locus is drawn by the point nearest to the axis, and the other locus is drawn by the point furthest from the axis.

Abstract: This invention presents a magnetic recording disk comprising a disk-shaped substrate and a magnetic film provided on the substrate for magnetic recording. The substrate is made of glass. A texture for giving magnetic anisotropy with the magnetic film is formed on a surface of the substrate. A substrate coat is deposited over the texture. The magnetic film is provided on the substrate coat. This invention also presents a method and a system for manufacturing the magnetic recording disk. The method comprises a step to form the texture with a surface of the substrate, a step to deposit the substrate coat over the texture, and a step to deposit the magnetic film on the substrate coat. The system comprises a texture formation apparatus that forms the texture with a surface of the substrate, a substrate-coat deposition apparatus that deposits the substrate coat over the texture, and a main film-deposition apparatus that deposits films including the magnetic film on the substrate coat.

Abstract: This invention presents a method and an apparatus for manufacturing a magnetic recording disk, where steps from magnetic-film deposition to lubricant-layer preparation are carried out without vacuum breaking. The invention also presents a method and an apparatus for manufacturing a magnetic recording disk, where a substrate is cleaned prior to the lubricant-layer preparation. The invention also presents a method and an apparatus for manufacturing a magnetic recording disk, where burnishing is carried out in vacuum after the magnetic-film deposition. The invention also presents a method and an apparatus for manufacturing a magnetic recording disk, where post-preparation treatment to coordinate adhesive strength and surface lubricity of the lubricant layer is carried out in vacuum.

Abstract: A magnetic sensor device comprising a magnetic element and a wire wound around the magnetic element. The magnetic element has a cross-sectional area of not more than 0.55 mm.sup.2 and a saturation magnetostriction constant .lambda.s whose absolute value is smaller than 1.times.10.sup.-6, with Sw/Sm being equal to or smaller than 9, provided that Sw is the cross-sectional area of the wire and Sm is the cross-sectional area of the magnetic element. Preferably, the magnetic element has an elastic limit .sigma.m greater than 1,000 MPa, and the elongation the magnetic element experiences upon application of a stress equal to the elastic limit .sigma.m is between 1.0% and 5.0%. It is also preferable that the magnetic element and the wire are covered with a resin layer to form an integral unit.

Abstract: A magnetic element comprising a thin film having a uniaxial magnetic anisotropy partly disposed on a polymer substrate. The magnetic element exhibits a discontinuous magnetic reversal under an applied magnetic field having a magnitude that is not smaller than a predetermined value. Despite its simple structure, the magnetic element exhibits excellent magnetic characteristics. Furthermore, the magnetic element exhibits little variation in magnetic characteristics and its magnetic characteristics are therefore high reproducible.

Abstract: A magnetic element comprising a first thin film and a second thin film having a coercive force that is greater than the coercive force of the first thin film formed on a substrate. The magnetic element exhibits a continuous magnetic reversal under an applied alternating magnetic field having a magnitude that is smaller than the coercive force of the second thin film to cause said first thin film to undergo magnetic reversal. The magnetic element also exhibits a discontinuous sudden magnetic reversal under an applied alternating magnetic field having a magnitude that is greater than the coercive force of the second thin film. The configuration of the magnetic element has little effect on discontinuous magnetization response. Thus the magnetic element exhibits good magnetic characteristics even when formed in a small size.

Abstract: A magnetic marker which comprises a flexible organic polymer substrate having an anisotropic thermal shrinking property and a soft magnetic thin film having uniaxial magnetic anisotropy. The angle formed between the direction in which the organic polymer substrate has the highest degree of thermal shrinkage and the direction of magnetic easy axis in the soft magnetic thin film is in the range from 50.degree. to 90.degree.. The marker is a thin film of a simple structure, yet exhibits satisfactory magnetic characteristics. A roll having a plurality of magnetic markers, each comprising an organic polymer substrate and a soft magnetic thin film formed transversely on the surface, can be manufactured by a process relying upon the combination of (i) a roll coater method and (ii) a sputtering technique.

Abstract: A compact and superior magnetic marker for an electronics apparatus for surveillance of article comprises at one or more wire members and a plane member contacting substantially directly to each other. An angle of the magnetic easy axis of the plane member relative to the longitudinal direction of the wire member is between 40.degree. and 90.degree. to show large Barkhausen reversal. An influence of demagnetizing field can be reduced by using the simple structure. The magnetic marker can be produced continuously at a low cost.

Abstract: A thin-film magnetic material is formed on a polymer substrate. The material exhibits large Barkhausen discontinuity without intentional application of external tensile or torsional stress. The thin-film material may be produced by a sputtering technique wherein the normal to the substrate is directed obliquely to a target member. A biasing magnetic field in proximity to the substrate may also be used during film formation, and the substrate may be supported by a curved holder or a cylindrical roll-to-roll apparatus. The thin-film thus produced may be used as a marker in an article surveillance system or as a magnetic sensor.

Abstract: A fine amorphous metallic wire having a circular cross section and stability to a bias magnetic field, said wire being composed of an alloy having the following composition formula(Co.sub.1-a-b Fe.sub.a M.sub.b).sub.100-x-y Si.sub.x B.sub.ywherein M is at least one element selected from Cr, Mo, Ni, Nb, Ta, Pd, Pt, and Cu, x<20 atomic %, 7 atomic %.ltoreq.y<35 atomic %, 7 atomic %<x+y.ltoreq.35 atomic %, 0.01.ltoreq.a.ltoreq.0.1, and 0.001.ltoreq.b.ltoreq.0.05. The fine amorphous metallic wire has low magnetostriction, high magnetic permeability, high saturation magnetic flux density, and excellent toughness, and is stable against a bias magnetic field. Hence, it can be used as a material for electromagnetic devices such as a coordinate reading device, a current sensor, an eddy current sensor, a magnetic sensor, or a displacement sensor.

Abstract: A fine amorphous metallic wire having a circular cross section and stability to a bias magnetic field, said wire being composed of an alloy having the following composition formula(Co.sub.1-a Fe.sub.a).sub.100-x-y-z Si.sub.x B.sub.y Mn.sub.zwherein x<20 atomic %, 7 atomic %.ltoreq.y<35 atomic %, 7 atomic %<x+y.ltoreq.35 atomic %, 0.1 atomic %.ltoreq.z.ltoreq.3 atomic %, and 0.01.ltoreq.a.ltoreq.0.1. The fine amorphous metallic wire has low magnetostriction, high magnetic permeability, high saturation magnetic flux density, and excellent toughness, and is stable against a bias magnetic field. Hence, it can be used as a material for electromagnetic devices such as a coordinate reading device, a current sensor, an eddy current sensor, a magnetic sensor, or a displacement sensor.