170results about How to "Easily magnetized" patented technology

A magnetoresistive includes a first magnetic reference layer having a fixed magnetization direction, a magnetic free layer having a magnetization direction which is changeable by being supplied with spin polarized electrons, a second magnetic reference layer having a fixed magnetization direction, a first intermediate layer provided between the first magnetic reference layer and the magnetic free layer, and a second intermediate layer provided between the magnetic free layer and the second magnetic reference layer. The magnetic free layer and the first magnetic reference layer have directions of easy magnetization perpendicular or parallel to an in-plane direction. The first magnetic reference layer and the second magnetic reference layer have directions of easy magnetization perpendicular to each other.

A magnetic recording medium having a nonmagnetic substrate, and a soft magnetic layer and a ferromagnetic layer having a thickness of 5 to 150 nm formed in this order on the nonmagnetic substrate, in which, the ferromagnetic layer contains a spherical, ellipsoidal or plate-form ferromagnetic powder and a binder, and has an axis of easy magnetization substantially in a perpendicular direction, and the soft magnetic layer contains a spherical or ellipsoidal magnetite soft magnetic powder having a particle size of 30 nm or less, a rate of variation in particle size of 20% or less and a saturation magnetization of 10 to 60 Am²/kg, and a binder.

In a magnet-exciting rotating electric machine system, a rotor surface has magnetic salient poles and island-shaped magnetic poles alternately in circumferential direction, and the island-shaped magnetic poles are constituted so that magnetic flux coming from an external source does not flow through. A magnetic excitation part magnetizes the island-shaped magnetic poles and the magnetic salient poles collectively in the same direction, and then control a flux amount flowing through an armature. The armature has armature coils that face the magnetic salient pole and the island-shaped magnetic pole simultaneously so that driving torque fluctuation or power generation voltage waveform distortion is controlled. The magnetic excitation part changes magnetization state of a field magnet irreversibly, or changes an excitation current to an excitation coil to control a flux crossing the armature.

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.

A magnetic recording medium having a magnetic layer with an L₁₀ structure and an easy magnetization axis lying about 35° out-of-plane of the magnetic layer is disclosed. This medium has very high coercivity (Hc) and anisotropy field (Hk), giving rise to improved thermal stability. Combined with improved writability of the canted magnetic easy axis, this media enables improved recording signal-to-noise ratio (SNR).

A total of three permanent magnets, installed in a rotor core closely to an outer cylindrical surface of the rotor core, are disposed at predetermined angular pitches in the circumferential direction of the rotor core. All of the permanent magnets are magnetized in such a manner that the direction of magnetization is the same when seen in the radial direction. A plurality of magnet-less holes, extending in the axial direction in the vicinity of the outer cylindrical surface of the rotor core, are provided between two adjacent permanent magnets.

A PMR writer is disclosed wherein a magnetic assist layer (MAL) made of an anisotropic (−Ku) or (+Ku) magnetic material is formed along a main pole trailing side to optimize the vertical magnetic field and field gradient at the air bearing surface. A Ru seed layer is formed between the main pole and (−Ku) MAL to induce a hard axis direction toward the main pole. A (−Ku) MAL is preferably comprised of hcp-CoIr while CoPt and FePt are examples of a (+Ku) MAL. The MAL has a down-track thickness from 5 to 20 nm, a width equal to the track width in a cross-track direction, and extends 100 to 500 nm in a direction toward a back end of the main pole. As a result, flux leakage from the main pole to trailing shield is reduced and aerial density is increased. A method for fabricating the PMR writer is provided.

The invention provides automatic magnetizing apparatus and method of two poles of a magnetic sheet. The magnetizing apparatus comprises a main stand, a charging part, a feeding part, a loading magnetic head fixing part, an upper magnetic head fixing part and a taking-out part, wherein the main stand is used for supporting each part of the apparatus; the charging part is installed on the main stand and is used for storing the magnetic sheet to be magnetized; the feeding part is installed on the main stand and is used for conveying the magnetic sheet to be magnetized to a magnetizing region from the charging part; the loading magnetic head fixing part is installed on the main stand and is provided with a lower magnetic head, and the magnetizing region for magnetizing the magnetic sheet to be magnetized is arranged at the middle part of the lower magnetic head; the upper magnetic head fixing part is provided with an upper magnetic head and is used for pressing the magnetic sheet conveyed by the feeding part between the upper magnetic head and the lower magnetic head, and the magnetic sheet to be magnetized can be magnetized in the state; and the taking-out part is used for taking out the magnetized magnetic sheet through a taking-out apparatus and putting the magnetized magnetic sheet into a storing apparatus of the loading magnetic head fixing part. The invention realizes the automatic magnetization of the two poles of the magnetic sheet, improves the production efficiency, and saves the manual labor and the cost.

An electrical machine comprising a stator and a rotor rotatable relative to the stator with an air gap therebetween is disclosed. The stator is provided with a first plurality of sources of magnetic field which is equally spaced in a circumferential configuration over the stator. The rotor is provided with a second plurality of sources of magnetic field which is equally spaced in a circumferential configuration over the rotor. The magnetic sources of at least one plurality are electromagnets; each electromagnet comprises at least one magnet coil resting on a magnet conductor. The magnetic conductor comprises at least one member made of magnetically isotropic and/or anisotropic materials.

A magnetic recording medium, a hard disk using the same, and a manufacturing method thereof are provided. In one example, the magnetic nano-particle medium is formed by depositing a magnetic nano-particle colloid on a substrate, wherein the axes of easy magnetization of respective crystalline particles are aligned with high accuracy. A layer of L10 alloy nano-particles which will exhibit magnetic properties through an order-disorder transition, and arranged at a substantially uniform spacing on a substrate, and a carbon-containing covering film for surrounding these nano-particles and making the spacing substantially uniform are provided. To the L10 alloy of the nano-particles, at least one non-magnetic element is added, or a covered layer comprising at least one non-magnetic layer is formed therearound. This makes it possible to implement a magnetic recording medium wherein the average diameter of nano-particles is small, and the nano-particle diameter dispersion is small, and the axes of magnetic anisotropy are aligned.

A magnetic coupler having higher response is provided. The magnetic coupler includes a thin film coil wound in a first layer; a first MR element being disposed in a second layer, and detecting an induced magnetic field generated by a signal current flowing through the thin film coil; and yokes being disposed close to the first MR element, and including a soft magnetic material. The first MR element is disposed in a position corresponding to a linear region of the thin film coil in a stacking direction. The yokes are disposed at both of an inner turn side and an outer turn side of the thin film coil in a manner of interposing the first MR element in the second layer. Thus, reduction in intensity of the induced magnetic field is suppressed, and intensity distribution of the induced magnetic field becomes flatter.

Disclosed herein are a rotor and a method of manufacturing the rotor. The rotor includes a rotor assembly including magnets and rotor cores, and a molding unit including a first molding unit disposed by being firstly injection molded to support the rotor assembly before the magnets are magnetized and a second molding unit disposed by being secondly injection molded to support the rotor assembly after the magnets are magnetized.

A ring motor (1) as a direct drive, particularly for vertical mills or rod mills, has a stator (6) and a rotor (12) configured as a rotating milling body (10), wherein the stator (6) has at least two different excitation systems, and the milling body (10) has only a toothed structure, which electromagnetically interacts with the excitation systems of the stator (6) and thus brings about a rotation of the milling body (10).

A magnetic recording medium has a seed layer provided on a substrate surface, an underlayer provided on the underlayer, and a recording layer provided on the underlayer. Information is recorded in the recording layer by magnetizing the recording layer in a recording direction. The seed layer is formed by a polycrystal of crystal grains made of an alloy material having a B2 crystal structure, and a [100] crystal orientation of the crystal grains are inclined towards one of two sides partitioned by a plane that is formed by the recording direction and a substrate normal which is normal to the substrate surface.

A flat soft magnetic metal powder is provided that includes: Ni in the range of 60 to 90 mass %, one or more kinds of Nb, V, and Ta in the range of 0.05 to 20 mass % in total (0.05 to 19.95 mass % when Mo is added thereto), Mo in the range of 0.05 to 10 mass % if necessary, one or two kinds of Al and Mn in the range of 0.01 to 1 mass % in total if necessary, and the balance including Fe; an average grain size of 30 to 150 μm and an aspect ratio (average grain size/average thickness) of 5 to 500; and a flat face. Here, with a peak intensity of a face index (220) in an X-ray diffraction pattern I₂₂₀ and a peak intensity of a face index (111) I₁₁₁, a peak intensity ratio I₂₂₀/I₁₁₁ is in the range of 0.1 to 10.

An electric traction motor for a vehicle including a housing, a wound stator field located in the housing, a rotor magnetically interacting with the wound stator field, high energy magnets configured in the rotor, and low energy magnets configured in the rotor.

A magnetic field sensor comprises: a magnetic field detecting element that detects magnitude of an external magnetic field based on electric resistance of the magnetic field detecting element to sense current, the electric resistance being varied in accordance with the external magnetic field; an upper shield layer that is formed to cover the magnetic field detecting element; and a protective layer that is formed above the upper shield layer with respect to a direction of stacking. The upper shield layer includes a first portion at least part of which covers a top surface of the magnetic field detecting element, and a second portion that covers the first portion, and, the first portion has a larger absolute value of magnetostriction than the second portion.

The invention relates to a high-power wide-speed adjustment built-in permanent magnet brush wheel-free motor for an electric automobile, which comprises a shell, and a rotor and a stator arranged in the shell. The rotor comprises a stator core and a stator winding which are fixed on the inner wall of the shell. The stator core comprises a stator yoke, a stator slot and a stator tooth. The rotor comprises a rotating shaft and a rotor core. An inner circle of the rotor core is uniformly embedded with radical magnetizing rectangular magnetic steel strips or cracked radical magnetizing rectangular steel strips along the circumferential direction. The radical magnetizing rectangular magnetic steel strips or the cracked radical magnetizing rectangular steel strips form permanent magnetic poles. An external circle of a pole shoe of a rotor is of a non-concentric arc-shaped curved surface and provided with non-uniformly symmetric radial air gaps. Magnet-shielding magnetic bridges are arranged between the magnetic poles and the high saturation of a magnetic circuit at a cross section of the magnet-shielding magnetic bridges is ensured. The radical insertion depth of the magnetic steel strips in the core, the width of an empty groove of a magnet-embedding steel groove, the angle of the empty groove of the magnet-embedding steel groove, the angle of polar arc and so on are adjusted to realize smooth operation with high efficiency, high power output, wide speed adjustment and quick response.

Provided is a spin-orbit-torque magnetization rotational element that suppresses re-adhesion of impurities during preparation and allows a write current to easily flow. The spin-orbit-torque magnetization rotational element includes a spin-orbit torque wiring that extends in a first direction, and a first ferromagnetic layer that is located on a side of one surface of the spin-orbit torque wiring. A side surface of the spin-orbit torque wiring and a side surface of the first ferromagnetic layer form a continuous inclined surface in any side surface.