Abstract: A super-magnetostrictive alloy has a high coefficient of magnetostriction and satisfactory toughness. The first type of the super-magnetostrictive alloy has a composition whose atomic ratio is expressed by (Tb.sub.x Dy.sub.1-x (Fe.sub.1-y Mn.sub.y).sub.z, where 0.35.ltoreq.x.ltoreq.0.9, 0.001.ltoreq.y.ltoreq.0.6, and 1.4.ltoreq.z.ltoreq.2.1. The second type of the super-magnetostrictive alloy has a composition whose atomic ratio is expressed by (Tb.sub.x Dy.sub.1-x (Fe.sub.1-y-w Mn.sub.y T.sub.w).sub.z, where 0.2.ltoreq.x.ltoreq.0.9, 0.05.ltoreq.y.ltoreq.0.4, 0.05.ltoreq.w.ltoreq.0.1, and 1.4.ltoreq.z.ltoreq.2.1, and where T is at least one of Co and Ni. The super-magnetostrictive alloys of both types have a Laves-type intermetallic compound phase as a main phase, and a rare earth metal phase is located between the portions having the main phase.

Abstract: A magnetic memory and a magnetic alloy thereof are disclosed, which comprise a magnetic alloy whose main phase is an iso-molar compound phase, the iso-molar compound phase being represented with general expression Pt(Fe.sub.1-x Mn.sub.x)Sn where the relationship of 0<x<1 is satisfied, wherein the magnetic memory records information by changing a magnetic property of the magnetic alloy.

Abstract: The extremely low temperature cold accumulating material for use in refrigerators, for example, comprises particles containing at least one kind of rare earth element selected from a group consisting of Y, La, Ce, Pr, Nd, Pm, Sm Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb. The proportion of particles each having a particle size of 0.01 to 3 mm is 70% or greater by weight with respect to the whole particles and the proportion of particles each having a shape such that the ratio of the major diameter to the minor diameter is not greater than 5 is 70% or greater by weight with respect to the whole particles. The particles are manufactured by quenching and solidifying a molten metal containing at least one kind of rare earth element described above. The thus manufactured extremely low temperature cold accumulating material is improved in cold accumulating efficiency and is specifically improved in mechanical strength and in chemical stability.

Abstract: A magnetstriction type actuator is capable of reducing an input power loss and increasing an output, which actuator is reduced in size and is applicable to a vibrator.

Abstract: A super-magnetostrictive alloy has a high coefficient of magnetostriction and satisfactory toughness. The first type of the super-magnetostrictive alloy has a composition whose atomic ratio is expressed by (Tb.sub.x Dy.sub.1-x (Fe.sub.1-y Mn.sub.y).sub.z, where 0.35.ltoreq.x.ltoreq.0.9, 0.001.ltoreq.y.ltoreq.0.6, and 1.4.ltoreq.z.ltoreq.2.1. The second type of the supermagnetostrictive alloy has a composition whose atomic ratio is expressed by (Tb.sub.x Dy.sub.1-x (Fe.sub.1-y-w Mn.sub.y T.sub.w).sub.z, where 0.2.ltoreq.x.ltoreq.0.9, 0.05.ltoreq.y.ltoreq.0.4, 0.05.ltoreq.w.ltoreq.0.1, and 1.4.ltoreq.z.ltoreq.2.1, and where T is at least one of Co and Ni. The super-magnetostrictive alloys of both types have a Laves-type intermetallic compound phase as a main phase, and a rare earth metal phase is located between the portions having the main phase.

Abstract: The polycrystalline magnetic substance for magnetic refrigeration in or gas refrigeration accordance with the present invention comprises a plurality of magnetic alloy fine crystalline powders that include at least one kind of rare-earth element selected from the group of Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb, with the remainder metal consisting substantially of 2 kinds selected from Al, Ni, Co, and Fe, and a metallic binder which forms a compact together with the fine crystalline particles, where the abundance ratio of the metallic binder in the compact is 1 to 80% by volume.

Abstract: In a method for producing a resin-bonded rare earth-iron-boron magnet, a powder is subjected to a heat-treatment below its melting point. The powder can be either: (1) a mixture of both: (a) a powder of a rare earth-iron-boron magnetic alloy comprising about 8 to about 30 atomic percent of R, which stands for at least one selected from the group of Y (yttrium) and rare earth elements, about 2 to about 28 atomic precent of B(boron), and at least 50 atomic percent of Fe(iron) and (b) at least one of the group consisting of R, R-oxides, which are oxides of R, and R-compound, which are the compounds consisting essentially of more than 30 atomic percent of R and the balance substantially of at least one of Fe and Co; or (2) a rare earth-iron-boron magnetic alloy comprising about 8 to about 30 atomic percent of R, about 2 to about 28 atomic percent of B, about 0.1 to about 13 atomic percent of Ga, and at least 50 atomic percent of Fe. The resultant heat-treatment powder is then bonded with a resin.

Abstract: Disclosed is a planar inductor which has spiral conductor coil means sandwiched between ferromagnetic layers with insulating layers interposed therebetween. The spiral conductor coil means is formed of two spiral conductor coils of the same shape arranged flush with and close to each other. Moreover, the two spiral conductor coils are connected electrically to each other so that currents of different directions flow individually through the conductor coils. Furthermore, the spiral conductor coil means is sandwiched between the two ferromagnetic layers with the insulating layers therebetween, each of the ferromagnetic layers having an area greater than the combined area of the two conductor coils. In the planar inductor according to the present invention, inductance is prevented from lowering while its components are being bonded together, so that the inductance value per unit volume is increased.

Abstract: A torque detecting apparatus utilizing a magneto-elastic effect including a magnetic metal thin strip fixed on the circumferential surface of a torque transmitting shaft as an object of torque detection, an induced magnetic anisotropy given in advance to the magnetic metal thin strip, the induced magnetic anisotropy appearing in a direction of a principal stress produced in the magnetic metal thin strip when a torque is imposed on the torque transmitting shaft, a shape magnetic anisotropy of the magnetic metal thin strip caused by a shape of the magnetic metal thin strip, the shape magnetic anisotropy appearing in a direction forming an angle of 45.degree. with the direction of the principal stress, and detection means for detecting a change in magnetic anisotropy produced in the magnetic metal thin strip by a torque imposed on the torque transmitting shaft.

Abstract: A magnetic refrigerant for magnetic refrigeration which comprises a sintered body containing at least one of rare earth elements selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and yttrium and a balance consisting essentially of at least one of aluminum, nickel and cobalt.This invention provides sintered magnetic bodies which are suited for use as magnetic refrigerants, and also provides significant contribution to the performance improvement of magnetic refrigerators and to the materialization of regenerator-type magnetic refrigerants.

Abstract: A torque detecting apparatus utilizing a magnetoelastic effect comprising one or more pairs of thin magnetic metal strips affixed to a torque-transmitting shaft subjected to torque detection and having magnetic anisotropy induced in a predetermined direction, and one or more pairs of detecting cores paired with the above one or more pairs of thin magnetic metal strips, fixed in contact with the thin magnetic metal strips, each of the cores of the one or more pairs of detecting cores having a detecting coil wound therearound, In one embodiment, the torque detecting apparatus utilizes a magnetoelastic effect of thin magnetic metal strip wherein the absolute value of saturated magnetostriction constant .lambda.s of the thin magnetic metal strip is less than 1.times.10.sup.-6.

Abstract: A method for recording and reproducing information on or from an optical recording medium, which comprises:recording information by illuminating light to the optical recording medium which is equipped as a recording film with a thin film comprising dispersed fine grains of a material capable of showing a metal-insulator transition to cause the metal-insulator transition owing to the heating effect of the light; and reproducing the information by utilizing changes in optical characteristics owing to a plasma resonance absorption by the fine grains dispersed in the thin film. The method of this invention permits high-density recording with high sensitivity and upon reproduction, enables reproduction of record with a high signal/noise ratio. The recording medium obtained by this method is an erasable optical recording medium, which permits its reutilization for recording and reproduction after erasure of the previously-stored record.

Abstract: A torque sensor of noncontact type, by which can be stably measured the torque of a shaft with a sufficient S/N ratio under the influence of external magnetic noise, such as an induction magnetic flux which is produced in an induction motor, and which can be readily disposed in a comparatively small space. When provided on an induction motor, the torque sensor is mounted on the induction motor in noncontacting relationship. The torque sensor detects the torque of the shaft and includes a pair of magnetic material members provided on respective circumferential portions of the peripheral surface of a shaft. A pair of magnetic detectors are disposed at opposite locations at which external magnetic fields having opposite phase exist. The detectors detect the variation of the magnetic characteristics of the magnetic materials, and a signal processing circuit produces a mean value of output signals obtained from the magnetic detectors.

Abstract: In a torque sensor of a noncontact type for sensing a rotary torque applied to a shaft, a magnetic ribbon of a film shape formed of a magnetic material and applied in advance with an induced magnetic anisotropy in the direction of an angle .theta. along the circumference of a shaft is bonded to the shaft along its circumference. A U-shaped first core member having end faces opposite to the ribbons is provided in the vicinity of the shaft. An exciting coil for producing a magnetic flux and a detecting coil are wound around the core member, and the magnetic flux produced by the exciting coil and introduced through the ribbon to the core member is detected by the detecting coil. When an exciting current of a predetermined frequency is supplied from an oscillator to the exciting coil to produce a magnetic flux, an output signal is generated from the detecting coil and is measured by a voltmeter.

Abstract: In a torque sensor of a noncontact type for sensing a torque applied to a shaft, a magnetic ribbon is bonded to a circumferential portion of the peripheral surface of the shaft, and a core member made of a magnetic material is arranged above the shaft surface so that its end faces are faced to the magnetic ribbon. A exciting coil and a detecting coil wound around the core so that a magnetic flux produced by the exciting coil and delivered to the detecting coil is detected by the detecting coil. The magnetic ribbon has a length L0 equal to or smaller than one half of the circumferential length Ls of the shaft 4 and satisfying an inequality given byL1.ltoreq.L0.ltoreq.2L1where L1 is the center-to-center distance between the end faces of the core.

Abstract: Disclosed is a comprising a powdered alloy composed of 23 to about 29% by weight of samarium, 0.2 to about 7% by weight of titanium, 3 to about 9% by weight of copper, 10 to about 25% by weight of iron, and the balance of cobalt principally; said powdered alloy being sintered to obtain a sintered body, followed by(a) annealing the sintered body at a cooling rate of not more than 5.degree. C./min from an annealing-initiating temperature of from 600.degree. to 900.degree. C., or(b) subjecting the sintered body to a multi-stepwise aging processing initiated from a higher temperature to a lower temperature within the temperature range of from 350.degree. to 900.degree. C.The magnet is excellent in all the magnetic properties such as residual magnetic flux density, coercive force and maximum energy product, and also excellent in antioxidation property.

Abstract: A torque sensor of noncontact type, by which can be stably measured the torque of a shaft with a sufficient S/N ratio under the influence of external magnetic noise, such as an induction magnetic flux which is produced in an induction motor, and which can be readily disposed in a comparatively small space. When provided on an induction motor, the torque sensor is mounted on the induction motor in noncontacting relationship. The torque sensor detects the torque of the shaft and includes a pair of magnetic material members provided on respective circumferential portions of the peripheral surface of a shaft. A pair of magnetic detectors are disposed at opposite locations at which external magnetic fields having opposite phase exist. The detectors detect the variation of the magnetic characteristics of the magnetic materials, and a signal processing circuit produces a mean value of output signals obtained from the magnetic detectors.