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7470334 |
A method for manufacturing a sintered compact includes the steps of preparing an alloy powder having a composition represented by Expression 1: RT W (where, R is at least one kind of rare earth metal, T is at least one kind of transitio...
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7441324 |
A method is provided for preserving the transverse biasing of a GMR (or MR) read head during back-end processing. In a first preferred embodiment, the method comprises magnetizing the longitudinal biasing layers of the read head in a tra...
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7416613 |
A method for compacting a magnetic powder in a magnetic field comprising steps of filling a die with a magnetic powder, applying a pulsed magnetic field to the magnetic powder in the die to orientate the powder, and compressing the magne...
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7399368 |
A permanent magnet comprises a hard magnetic material that contains at least a rare earth element and an anti-ferromagnetic material, wherein the hard magnetic material and the anti-ferromagnetic material are magnetically coupled. A volu...
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7396419 |
A method for manufacturing a sintered compact includes the steps of preparing an alloy powder having a composition represented by Expression 1: RT W (where, R is at least one kind of rare earth metal, T is at least one kind of transitio...
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7390369 |
An inventive method of making a rare-earth alloy powder is used to produce a rare-earth sintered magnet, whose main phase has a composition R 2 T 14 A (where R is one of the rare-earth elements including Y; T is Fe with or without a non-...
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7384487 |
It is an object of the present invention to provide a method for producing a magnetostrictive element, capable of assuredly producing a magnetostrictive element by powder metallurgy. In a container for sintering 10 , a compact 100 is ...
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7371292 |
A Nd—Fe—B type anisotropic exchange spring magnet is produced by a method of obtaining powder of a Nd—Fe—B type rare earth magnet alloy which comprises hard magnetic phases and soft magnetic phases wherein a minimum width of the ...
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7371290 |
To avoid various problems caused by remnant magnetization and produce an anisotropic bonded magnet at a reduced cost, a method for producing an anisotropic bonded magnet by feeding a magnetic powder (such as an HDDR powder) into the cavi...
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7364628 |
A solid material for a magnet, comprising a rare-earth/iron/nitrogen/hydrogen system magnetic material.
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7344653 |
A bitumen film containing magnetic powder is heated prior to magnetization to a temperature enabling the magnetic powder particles to be oriented according to the effect of the magnetic field. The bitumen film is sufficiently cooled afte...
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7344606 |
An anisotropic bonded magnet is produced at a low cost by avoiding various problems caused by remanence. Also, the unit weight and density of a compact is increased by filling even a cavity, having no easily feedable shape, with a magnet...
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7344605 |
An anisotropic exchange spring magnet powder complexing a hard magnetic material and a soft magnetic material, wherein a rare earth metal element, a transition metal element, boron and carbon and the like are contained, and the hard magn...
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7338566 |
The present invention relates to a Sm—Co based magnet alloy useful as a raw material for producing magnets having high magnetic properties, such as sintered or bonded magnets, methods for producing such an alloy, and sintered or bonded...
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7320169 |
In a conventional spin valve the shunt resistance of the pinning layer reduces the overall efficiency of the device. This problem has been overcome by using IrMn for the pinning layer at a thickness of about 20 Angstroms or less. For the...
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7314530 |
A press machine 10 includes a die 12 with a through hole 12 a that defines a cavity, a first press surface 14 a and a second press surface 16 a for pressing a magnetic powder 18 loaded in the cavity, and magnetic field genera...
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7302867 |
A magnetic transducer element is formed by rotating an integral region of a shaft about an axis in the presence of a magnetic source. An annulus of magnetization results in having its magnetization in the axial direction. The exterior ma...
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7255752 |
A method for manufacturing an R-T-B system rare earth permanent magnet that is a sintered body comprising a main phase consisting of an R 2 T 14 B phase (wherein R represents one or more rare earth elements (providing that the rare earth...
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7255751 |
When an R-T-B system rare earth permanent magnet is obtained by a mixing method to obtain a sintered body with a composition consisting essentially of 25% to 35% by weight of R (wherein R represents one or more rare earth elements, provi...
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7244318 |
A blended powder including a first powder containing an R 2 T 14 B phase as a main phase, and a second powder containing an R 2 T 17 phase at 25 wt % or more of the whole is prepared. Herein, R is at least one element selected from the ...
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7232495 |
The method of the present invention includes a step of preparing a rare earth magnet 22 disposed for forming a cylinder 22 a , a first magnetizing step of applying a first external magnetic field H 1 to the rare earth magnet 22 , th...
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7211157 |
A rare-earth alloy ingot is produced by melting an alloy composed of 20–30 wt % of a rare-earth constituent which is Sm alone or at least 50 wt % Sm in combination with at least one other rare-earth element, 10–45 wt % of Fe, 1–10 ...
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7207102 |
Methods are provided for forming a plurality of permanent magnets with two different north-south magnetic pole alignments for use in microelectromechanical (MEM) devices. These methods are based on initially magnetizing the permanent mag...
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7204891 |
Rare earth magnet scrap and/or sludge is remelted for reuse. Once a rare earth-free magnet-constituent metal feed is loaded in a melting furnace and heated into a melt, a rare earth-containing metal feed and the rare earth magnet scrap a...
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7201809 |
A radially anisotropic ring magnet endowed with good magnetic characteristics and having throughout the magnet an angle of 80 to 100° between a center axis thereof and a radial anisotropy imparting direction is manufactured by a pressin...
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7166171 |
Disclosed is a longitudinal magnetic field compacting method and device for manufacturing a neodymium (Nd) based rare earth magnet in the shape of a butterfly for use in VCM of HDD or DVD, a disk or coin for use in coreless motors, and a...
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7063752 |
A method for refining the grain size of alloys which undergo ferromagnetic to paramagnetic phase transformation and an alloy produced therefrom. By subjecting the alloy to a timed application of a strong magnetic field, the temperature o...
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7056393 |
A method of making a sintered body for a rare earth magnet includes the steps of (a) preparing a first coarse powder by coarsely pulverizing a rare earth alloy sintered body by a hydrogen pulverization process, (b) preparing a first fine...
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7037465 |
A powder compacting method includes the steps of: providing a powder material; loading the powder material into a cavity; uniaxially pressing the powder material, which has been loaded into the cavity, between two opposed press surfaces,...
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7014811 |
A method for producing rare earth sintered magnets includes the steps of pressing and compacting an alloy powder for the rare earth sintered magnets, thereby preparing a plurality of green compacts, arranging the green compacts on a rece...
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7004228 |
To make a raw alloy, consisting mostly of amorphous structure, highly productively and at a reduced cost for a nanocomposite magnet, a molten alloy represented by Fe 100-x-y-z R x Q y M z (where R is at least one element selected from P...
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6991686 |
To provide a method for producing a magnetostrictive material of excellent magnetostrictive characteristics. The method for producing a magnetostrictive material, wherein a mixture composed of Starting Materials A, B and C is sintered, ...
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6984271 |
A rare earth magnet to be used in a motor. The rare earth magnet comprises rare earth magnet particles. Additionally, a rare earth oxide is present among the rare earth magnet particles, the rare earth oxide being represented by the foll...
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6984270 |
A radial anisotropic sintered magnet formed into a cylindrical shape includes a portion oriented in directions tilted at an angle of 30° or more from radial directions, the portion being contained in the magnet at a volume ratio in a ra...
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6982010 |
The present invention relates to a high performance rare earth-iron giant magnetostrictive material of the formula (Tb x1 Dy x2 Sm x3 Ho x4 R x5 )(S y1 P y2 Fe 1-y1-y2-y3 T y3 ) Q obtained by using an industry grade pure iron, instead o...
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6863742 |
A bulk anisotropic rare earth permanent magnet consists essentially of R, Fe or Fe and Co, and N, wherein R is selected from rare earth elements inclusive of Y and contains Sm as a main component, and has a primary phase of Th 2 Zn 17 t...
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6764607 |
A powder for forming a R—Fe—B bonded magnet, wherein an R compound, such as an R oxide, an R carbide, an R nitride or an R hydride, which is contained in a raw material powder such as a super rapidly cooled powder or a hydrogen treat...
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6746545 |
An R—Fe—B permanent magnet wherein R is Nd or a combination of Nd with a rare earth element is prepared by casting an R—Fe—B alloy, crushing the alloy in an oxygen-free atmosphere of argon, nitrogen or vacuum, effecting comminuti...
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6741440 |
A magnetization method and apparatus is described as utilizing a pair of mechanically counter-vibrated permanent magnets having mutually facing unlike magnetic poles, and wherein a ferromagnetic article, or article containing ferromagnet...
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6669788 |
A Fe—B—R type permanent magnetic, consisting of: 13-19 atomic % R, where R consists essentially of a mixture of rare earth elements Nd and/or Pr, and Ce, where Ce is between 0.2 and 5.0 wt. % of R; 4-20 atomic % B, and the balance co...
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6653548 |
A cuboid p-type and an n-type thermoelectric conversion material having a composite of an alloy powder for a rare earth magnet and a bismuth-based thermoelectric conversion material that has been rendered a p-type semiconductor or an n-t...
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6602352 |
A method and apparatus for manufacturing a rare earth magnet is disclosed. In a first step, a compact is produced by compacting rare earth alloy powder in a predetermined space in an orienting magnetic field. Next, a demagnetizing proces...
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6594124 |
An improved stabilization scheme for a GMR read head is described. Two important changes relative to prior art designs have been introduced. Instead of biasing by means of a permanent magnet or through exchange coupling with an antiferro...
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6589366 |
Method of making an active magnetic refrigerant represented by Gd 5 (Si x Ge 1−x ) 4 alloy for 0≦x≦1.0 comprising placing amounts of the commercially pure Gd, Si, and Ge charge components in a crucible, heating the charge contents...
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6375759 |
A new class of processes for fabrication of precision miniature rare earth permanent magnets is disclosed. Such magnets typically have sizes in the range 0.1 to 10 millimeters, and dimensional tolerances as small as one micron. Very larg...
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6368551 |
The method for preparation of sintered permanent magnets according to the present invention comprises the steps of: mixing fully fine powder of a crystalline mother alloy for permanent magnet containing a rare-earth element, Fe and B as ...
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6361738 |
The method of producing an R—Fe—B magnet of the present invention is characterized in that R—Fe—B alloy fine powder is molded in a magnetic field and sintered using a lubricant for molding magnets containing specific components, ...
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6214288 |
An improvement is proposed in the powder metallurgical method for the preparation of a rare earth-based permanent magnet comprising the steps of compression-molding a magnet alloy powder into a powder compact and sintering the powder com...
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6210495 |
Method for obtaining a solid, magnetically anisotropic material, includes the steps of heating an alloy containing a rare earth element and at least one transition metal to a temperature higher than the melting temperature of the alloy a...
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6187259 |
The object of the present invention is to provide rare-earth system sintered magnets such as R--Fe--B system or R--Co system having excellent magnetic properties, unique configuration of a small size, thin wall thickness and intricate ge...
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