Abstract: The addition of a chelating agent or a chelating agent and an antioxidant in combination to a rare-earth bonded magnet composition and a rare-earth bonded magnet comprising a rare-earth magnetic powder and a resin component can provide improved moldability and magnets having high performance and high corrosion resistance. Further, the regulation of property values of the magnet composition enables the occurrence of troubles to be avoided during molding, resulting in improved productivity. Furthermore, the use of at least two resins as a resin component in an extruding composition contributes to improvement in moldability and consequently increase in throughput. Furthermore, the use of extrusion, involving setting by cooling, and not compression molding in the production of magnets can provide high-density, high-performance magnets.

Abstract: The inventive material exhibits giant magnetoresistance upon application of an external magnetic field at room temperature. The hysteresis is minimal. The inventive material has a magnetic phase formed by eutectic decomposition. The bulk material comprises a plurality of regions characterized by a) the presence of magnetic lamellae wherein the lamellae are separated by a distance smaller than the mean free path of the conduction electrons, and b) a matrix composition having nonmagnetic properties that is interposed between the lamellae within the regions. The inventive, rapidly quenched, eutectic alloys form microstructure lamellae having antiparallel antiferromagnetic coupling and give rise to GMR properties. The inventive materials made according to the inventive process yielded commercially acceptable quantities and timeframes. Annealing destroyed the microstructure lamellae and the GMR effect. Noneutectic alloys did not exhibit the antiparallel microstructure lamellae and did not possess GMR properties.

Abstract: A harmonic-type EAS marker includes a wire segment formed of cobalt alloy. To form the wire segment, the cobalt alloy is cast as an amorphous wire, die-drawn to a smaller diameter, and then annealed with application of longitudinal tension. The annealed wire is cut to produce wire segments which have a magnetic hysteresis loop with a large Barkhausen discontinuity at a lower threshold level than has previously been achieved.

Abstract: A magneto-resistive head is provided with a substrate, a lower shield layer made of a Fe-system magnetic material and provided above the substrate, and a non-magnetic insulator layer provided above the lower shield layer. The non-magnetic insulator layer has a function of suppressing deterioration of surface roughness of the lower shield layer when subjected to an annealing process under a magnetic field in order to improve magnetic characteristics of the lower shield layer to desired magnetic characteristics.

Abstract: A magnetic powder is disclosed which is characterized by possessing a powder compression characteristic such that the magnetic powder, after being packed in a closed container, pressed at a load of 400 kgf/cm.sup.3, and relieved of the load, exhibits a packing density in the range of 2.5 to 3.5 g/cm.sup.3 and a geometric standard deviation of not more than 1.5 in the particle diameter distribution. A magnetic recording medium using the magnetic powder mentioned above has high packing and, consequently, secures high output, and has ample diminution of noise.

Abstract: A high-frequency composite material, having soft magnetic and dielectric characteristics, comprising a soft magnetic alloy powder represented by the general composition A.sub.a M.sub.b D.sub.c and a synthetic resin, wherein A represents at least one element or mixture thereof selected from the group consisting of Fe, Co and Ni; M represents at least one element or mixture thereof selected from the group consisting of Hf, Zr, W, Ti, V, Nb, Mo, Cr, Mg, Mn, Al, Si, Ca, Sr, Ba, Cu, Ga, Ge, As, Se, Zn, Cd, In, Sn, Sb, Te, Pb, Bi and rare earth elements; D represents at least one element or mixture thereof selected from the group consisting of O, C, N and B; and the suffixes a, b, and c in the general formula A.sub.a M.sub.b D.sub.c satisfy the following equations represented by atomic percent: 40.ltoreq.a<80, 0.ltoreq.b.ltoreq.30, and 0<c.ltoreq.50.

Abstract: It is an object of the present invention to provide an amorphous hard magnetic alloy which can be produced by a casting method having a low cooling rate and has a large thickness not achieved by conventional liquid quenching methods, an amorphous hard magnetic casting alloy and a method for producing the amorphous hard magnetic cast alloy.An amorphous hard magnetic alloy in accordance with the present invention has the following general formula:A.sub.x --(Fe.sub.1-a Co.sub.a).sub.y --D.sub.zwherein A represents at least one element selected from the group consisting of Nd, Sm, Pr and Pm; D represents at least one element selected from the group consisting of Al, Ga, and Ge; suffixes x, y, and z satisfy 50.ltoreq.x.ltoreq.75, 10.ltoreq.y.ltoreq.45, and 5.ltoreq.z.ltoreq.15 atomic percent, and suffix a satisfies 0.ltoreq.a.ltoreq.0.5.

Abstract: Disclosed herein is magneto-plumbite ferrite particles for magnetic cards, which are represented by the following general formula:AO.multidot.n{(Fe.sub.1-(a+b) Bi.sub.a M.sub.b).sub.2 O.sub.3 }wherein A represents at least one metal selected from the group consisting of Ba, Sr and Ca, M represents either Co and Sn or Co, Ti and Sn, n is 5.5 to 6.1, a is 0.001 to 0.010 and b is 0.010 to 0.200, and in which the change of the coercive force with temperature in the temperature range of -10.degree. to 120.degree. C. is -1.5 to +1.5 Oe/.degree.C.

Abstract: There is disclosed a method of introducing magnetic anisotropy into a magnetic material, in which a laser beam is selectively radiated on the surface of a magnetic material to locally heat it, thereby forming a pattern of boundary phases for magnetically dividing a main phase of the magnetic material into a plurality of regions, and magnetic domains of the divided main phase regions are controlled to induce magnetic anisotropy in the main phase regions.

Abstract: Disclosed is a process using an electric field for contacting a substantially neutrally charged material, that is responsive to an electric field, with a substrate. Also disclosed is a disposable absorbent product, including the electrically responsive material, that is intended for the absorption of body fluids, prepared by the process.

Abstract: A resin magnetic compound is disclosed, comprising (i) from 65 to 77% by weight of a magnetic powder having been surface treated with from 0.01 to 5% by weight, based on the magnetic powder, of a mercaptosilane represented by the following formula (I) or a hydrolysis product of the mercaptosilane:(RO).sub.n R'.sub.(3-n) SiR"SH (I)wherein R and R' each represents an alkyl group having 1 or 2 carbon atoms; R" represents an alkylene group having from 2 to 6 carbon atoms; and n represents 2 or 3, (ii) from 14 to 30% by weight of polyphenylene sulfide resin, and (iii) from 9 to 21% by weight of glass fiber. The resin magnetic compound and a molded article obtained from the compound are excellent in thermal shock resistance, magnetic characteristics, and heat resistance.

Abstract: Disclosed is an absorbent composition including a hydrogel-forming polymeric material and a magnetically-responsive material; disposable absorbent products, including the absorbent composition, intended for the absorption of body fluids; and a method for incorporating the absorbent composition into disposable absorbent products.

Abstract: Biocompatability and orders greater magnetic responsiveness characterize a uniquely useful new product, magnetoferritin, comprising ferritin having a ferrimagnetically ordered ferrite core in place of the naturally occurring ferrihydrite core. A method of preparation is disclosed.

Abstract: Disclosed are an amorphous iron based alloy having excellent magnetic characteristics as well as bendability and a method of manufacturing the amorphous iron based alloy. The amorphous iron based alloy has a mean centerline Ra surface roughness of about 0.8 .mu.m or less and the formula Fe.sub.X B.sub.Y Si.sub.Z Mn.sub.a in approximate proportions wherein:75.ltoreq.X.ltoreq.82 at %7.ltoreq.Y.ltoreq.15 at %,7.ltoreq.Z.ltoreq.17 at %, and0.2.ltoreq.a.ltoreq.0.5 at %.The method of manufacturing the amorphous iron based alloy comprises quenching and solidifying a molten alloy having the formula Fe.sub.X B.sub.Y Si.sub.Z Mn.sub.a in approximate proportions wherein:75.ltoreq.X.ltoreq.82 at %7.ltoreq.Y.ltoreq.15 at %,7.ltoreq.Z.ltoreq.17 at %, and0.2.ltoreq.a.ltoreq.0.5 at %, andeffecting the quenching and solidifying steps in a Co.sub.2 atmosphere containing H.sub.2 in an amount of about 1-4% by volume.

Abstract: Light emitting diodes (LEDs) and LED bars and LED arrays formed of semiconductive material, such as III-V, and particularly AlGaAs/GaAs material, are formed in very thin structures using organometallic vapor deposition (OMCVD). Semiconductor p-n junctions are formed as deposited using carbon as the p-type impurity dopant. Various lift-off methods are described which permit back side processing when the growth substrate is removed and also enable device registration for LED bars and arrays to be maintained.

Abstract: There is disclosed a process for preparing a resin composition for powder molding, comprising 50 to 97 wt % of a metal or alloy powder and 50 to 3 wt % of a thermoplastic resin having heat resistance and crystallinity, which process comprises dissolving the thermoplastic resin having heat resistance crystallinity in a solvent and at the same time, dispersing therein at least one metal or alloy powder selected from iron, brass, nickel silver, stainless steel and aluminum, having an average particle diameter of not more than 500 .mu.m to thereby prepare a mixture. In addition, there is disclosed a process for producing a powder molded product which comprises cold compressing molding the above resin composition and then heating the molding at a temperature not less than the melting point of the thermoplastic resin. This powder molded product has excellent dimensional stability against heat, chemical resistance, and mechanical strength.

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 method of producing Fe-Ni system high permeability alloy comprising the steps of obtaining cast steel sheet 0.3 to 7 mm thick by direct casting of a steel melt containing 35 to 85% by weight of nickel with the balance of iron and unavoidable impurities, forcibly cooling the sheet from solidification to 1200.degree. C. at a cooling rate of at least 75.degree. C./s, and cold-rolling the sheet at a reduction ratio of at least 20%.

Abstract: A magnetic mateial which includes an impurity metal of relatively large atomic diameter such as zinc, titanium, zirconium, yttrium, or cadmium introduced uniformly therein in amount sufficient to distort its crystaline structure to alter its anisotrophy so that the permeability of the substance remains substantially constant with changes in temperature up to the permeability transition temperature and; there being also introduced uniformly therein further metallic atoms which achieve a desired transition temperature within an accuracy of at least 0.1.degree. C. such material being utilized in an apparatus adapted to be interrogated to disclose whether its temperature is above or below the transition temperature within at least 0.1.degree. C., the signal propagating properties of the material altering drastically at such temperature, the material having an output which is inherently digital and directly compatible with digital information processing and control without A/D conversion.

Abstract: Magnetostrictive rods formed from rare earth-iron alloys are subjected to a short time heat treatment to increase their Magnetostrictive response under compression. The heat treatment is preferably carried out at a temperature of from 900.degree. to 1000.degree. C. for 20 minutes to six hours.

Abstract: The invention comprises a continuous casting and crystallization method for manufacturing grain-oriented magnetostrictive bodies. A magnetostrictive alloy is melted in a crucible having a bottom outlet. The melt is discharged through the bottom of the crucible and deposited in an elongated mold. Heat is removed from the deposited melt through the lower end portion of the mold to progressively solidify the melt. The solid-liquid interface of the melt moves directionally upwardly from the bottom to the top of the mold, to produce the axial grain orientation.

Abstract: The method disclosed by which to prepare fine hexagonal ferrites for use in magnetic recording, is one which consists basically in dissolving (a) carbonates or other soluble compounds of an alkaline earth metal such as strontium or barium, (b) a carbonate or other soluble compound of cobalt, and (c) titanium trichloride, all in a solution of ferric citrate and water, whereupon a polycondensation is brought about by addition of ethylene clycol, and heat is applied to eliminate the water and organic matter from the compound. Addition of the alkaline earth metal, the cobalt and the titanium is proportioned precisely on the basis of the stoichimetric properties of the end-product, the formula for which isReO.(6-x)Fe.sub.2 O.sub.3.xCoO.xTiO.sub.2where x is the extent to which cobalt and titanium atoms replace iron atoms and Re is the alkaline earth metal. Final application of heat produces crystallization of the superfine hexaferrite particles.

Abstract: Magnetic powders have a thin film of a nitrogen- or sulfur-containing organic polymer synthesized on the individual particles by plasma polymerization. The film is not more than 100 .ANG. in thickness.

Abstract: A method of converting magnetic energy to mechanical energy comprising subjecting a material of the formula R.sub.x T.sub.1-x wherein R is a rare earth or mixtures thereof, T is Fe, Ni, Co, Mn, or mixtures thereof, and 0<x<1, to a change in magnetic field and of converting mechanical energy to magnetic energy comprising subjecting a material of the formula R.sub.x T.sub.1-x to a change in pressure.

Abstract: A method of heat treatments of amorphous alloy ribbons comprises the sequential steps of; grinding amorphous alloy ribbon continuously fed at a predetermined speed (V) selectively varied in the range of 1 cm/sec.ltoreq.V.ltoreq.50 cm/sec, to uniformly finish the ribbon, and successively, heat-treating the ribbon with its surface contacting a stationary or rotating heating body having a surface temperature (T) defined in the range of (T.sub.cry -200.degree. C.).ltoreq.V.ltoreq.(T.sub.cry +50.degree. C.), where T.sub.cry is a crystallization point temperature of the alloy, to uniformly enhance the magnetic properties of the ribbon, and to remove the specific curlings inherently caused by so-called splat cooling manufacturing method, without causing any developments of brittleness of the ribbon mentioned above.

Abstract: A slurry of ferrosilicon powder is applied to both sides of a low carbon steel strip. The particle size of the ferrosilicon powder is controlled so that, after the slurry coatings are dried, there exists on each side of the steel strip at least a single layer of closely packed particles. The coated strip is then compacted. It is next heated in a protective environment to cause uniform diffusion of silicon throughout the strip.

Abstract: A heat treated, wear-resistant high-permeability alloy consisting of Si, at least one element selected from Y and La series elements and Fe, and a heat treated, wear-resistant high-permeability alloy consisting of Si, Al, at least one element selected from Y and La series elements and Fe as main ingredients and containing at least one element selected from the group consisting of V, Nb, Ta, Cr, Mo, W, Cu, Ge, Ti, Ni, Co, Mn, Zr, Sn, Sb, Be and Pb as subingredients, have an initial permeability of more than 1,000, a maximum permeability of more than 3,000, a hardness of more than 490 (Hv) and an average grain size of smaller than 2 mm, and are particularly suitable as a magnetic material for magnetic heads in magnetic recording and reproducing systems.

Abstract: The subject of the invention is an alloy of magnetostrictive and piezomagnetic properties suitable for the production of cores of ultrasonic transducers. The alloy according to the invention contains, besides iron, 5 to 15% Al, 0.5 to 10% Co and up to 3% of other additives.

Abstract: Rare earth cobalt magnet materials, which comprised of cobalt, manganese, copper and 12 to 13 mole % of cerium and/or samarium are provided. These magnetic materials have improved magnetic characteristics, especially very high values of the maximum energy product.