526results about How to "Excellent magnetic properties" patented technology

An inductive write element is disclosed for use in a magnetic data recording system. The write element provides increased data rate and data density capabilities through improved magnetic flux flow through the element. The write element includes a magnetic yoke constructed of first and second magnetic poles. The first pole includes a pedestal constructed of a high magnetic moment (high B_sat) material, which is preferably FeRhN nanocrystalline films with lamination layers of CoZrCr. The second pole includes a thin inner layer of high B_sat material (also preferably FeRhN nanocrystalline films with lamination layers of CoZrCr), the remainder being constructed of a magnetic material capable of being electroplated, such as a Ni—Fe alloy. An electrically conductive coil passes through the yoke between the first and second poles to induce a magnetic flux in the yoke when an electrical current is caused to flow through the coil. Magnetic flux in the yoke produces a fringing field at a write gap whereby a signal can be imparted onto a magnetic medium passing thereby.

According to one embodiment, a method of manufacturing a magnetic recording medium includes depositing a magnetic recording layer on a substrate, forming masks on areas corresponding to recording regions of the magnetic recording layer, partially etching the magnetic recording layer in areas not covered with the masks with an etching gas to form protrusions and recesses on the magnetic recording layer, modifying the magnetic recording layer remaining in the recesses with Ne gas to form non-recording regions, and forming a protecting film on an entire surface.

A magnetoresistive effect element (1) has an arrangement in which a pair of ferromagnetic material layers (magnetization fixed layer (5) and magnetization free layer (7)) is opposed to each other through an intermediate layer (6) to obtain a magnetoresistive change by causing a current to flow in the direction perpendicular to the layer surface and in which the ferromagnetic material layers are annealed by anneal including rotating field anneal and the following static field anneal. A magnetic memory device comprises this magnetoresistive effect element (1) and bit lines and word lines sandwiching the magnetoresistive effect element (1) in the thickness direction. When the magnetoresistive effect element (1) and the magnetic memory device are manufactured, the ferromagnetic material layers (5, 7) are annealed by rotating field anneal and the following static field anneal. There are provided the magnetoresistive effect element that can obtain excellent magnetic characteristics by controlling magnetic anisotropies of the ferromagnetic material layers, the magnetic memory device including this magnetoresistive effect element and which may have excellent write characteristics, and methods for manufacturing these magnetoresistive effect element and magnetic memory device.

The present invention provides an oxide magnetic material, which includes a primary phase of a hexagonal ferrite containing metallic elements Ca, R, Fe and M, where M represents at least one element selected from the group including Co, Ni and Zn, and R represents at least one element selected from the group including Bi and rare earth elements including Y, with La being essentially included in R; wherein the proportions of the metallic elements Ca, R, Fe and M with respect to the total amount of the metallic elements are from 1 to 13 atomic % for Ca, from 0.05 to 10 atomic % for R, from 80 to 95 atomic % for Fe, and from 1 to 7 atomic % for M. The present invention also provides ferrite particles, a bonded magnet, a sintered magnet, a process for producing them, and a magnetic recording medium, which contain the oxide magnetic material.

In order to obtain joining force endurable for high-speed printing and realize an enhancement in magnetic characteristic, a plate-like arm for supporting a printing wire is laminated with a magnetic circuit forming member that is composed by laminating plural plates for forming a magnetic circuit, wherein a weld zone is formed on the laminated surface of the arm and plates with laser beam irradiation for fixing the arm and the magnetic circuit forming member with the weld zone.

A stator for a multiple-phase rotary electric machine provided a stator core with slots and a coil formed of a plurality of windings for individual phases. Each winding has slot-accommodated portions held in different slots, turn portions connecting the slot-accommodated portions outside of the slots in an axial direction, and a return portion that connects two of the turn portions and changes a winding direction of the winding at given slots. The turn portions include specific turn portions which are the same in a circumferential position as the turn portion connected to the one of the return portion. The specific turn portions are located, in a radial direction, to be drawn apart from the rotor than the slot-accommodated portions connected to the specific turn portions.

The invention relates to a method for preparing a composite material, which comprises the following steps of: putting a basal body subjected to pretreatment into a conventional electroplating bath, and applying an electric field and an ultrasonic field on the plating bath with an ultrasonic generator and a pulsing power source. The process of pulse-ultrasound electrodeposition generally comprises the following steps of: 1, elecroplating pretreatment comprising pretreatment of the basal body and preparation of electroplate liquid; 2, electrodeposition process: putting the basal body which is pretreated in the step one into the prepared electroplate liquid for electrodeposition; and3, post treatment of plating parts, mainly comprising the working procedures of ultrasonic cleaning for the plating parts which are deposited in the step two and anhydrous alcohol cleaning. In the invention, in the electroplate liquid containing nickel and iron ions and insoluble nanoparticles, the nanoparticles are uniformly distributed in the liquid by using ultrasonic stirring, the nanoparticles and substrate metal ions are simultaneously deposited to obtain the ferromagnetic nano composite material composed of substrate metal nickel-iron and the nanoparticles under the condition that positive and negative pulse current or voltage are applied.

The present invention provides an R-T-B type alloy as a raw material of a rare earth-based permanent magnet having excellent magnetic characteristics. The present invention provides an R-T-B type alloy (wherein R is at least one member selected from rare earth elements including Y, T is a transition metal essentially comprising Fe, and B is boron) which is a raw material for use in a rare earth-based permanent magnet, wherein the volume percentage of the region containing an R 2 T 17 phase having an average grain diameter of 3 m or less in the short axis direction is from 0.5 to 10%.

This invention relates to a fabricating method for anisotropically bonded magnet including: step S1 for adjusting the first mixture and the second mixture, where: the first mixture comprises the first magnetic powder, of which the grain size is in the range of 20-150mum, thermosetting resin of 2.0 wt%being added into the anisotropically bonded magnet, the first additive; the second mixture comprises the second magnetic powder, of which the grain size is in the range of 1-20mum, the second additive; step S2 for adjusting the first mixture and the second mixture; step S3 for making the magnetic intensity of the end part of the shaping metal die be under the 0.8T, the magnetic intensity of the central part of the shaping metal die is 5% higher than that of the said end part of the shaping metal die after said mixed compounds being filled into the metal die; step S4 for heating said mixed compounds at the atmosphere of inert gases or nitrogen gases so as to harden compounds.

A stator core 10 and its manufacturing method, the stator core 10 including laminated stator core sheets 17, each of the stator core sheets 17 punched out from a magnetic metal sheet 32, a central portion of the magnetic metal sheet 32 previously punched out to form a rotor core sheet 36, the stator core 10 including a thin section 24 formed in a magnetic pole piece 19 of each of the stator core sheets 17, the thin section 24 formed by pressing both sides of the magnetic pole piece 19 in a thickness direction and radially-inwardly elongating the magnetic pole piece 19. The present invention prevents the magnetic pole piece 19 from being curved and improves interlocking accuracies and dimensional accuracies in blanking the rotor core sheet 36 and the start core sheet 17 from one magnetic metal sheet 32.