111 results about "Perpendicular magnetic field" patented technology

A magnetic sensor includes magnetoresistive elements and a soft magnetic body. The magnetoresistive elements have multi layers including a magnetic layer and a nonmagnetic layer on a substrate, and exert a magnetoresistance effect. The soft magnetic body is electrically disconnected with the magnetoresistive elements, and converts a vertical magnetic field component from the outside into a magnetic field component in a horizontal direction so as to provide the magnetoresistive elements with the horizontally converted magnetic field component. The magnetoresistive elements have a pinned magnetic layer having a fixed magnetization direction and a free magnetic layer having a variable magnetization direction. The free magnetic layer is stacked on the pinned magnetic layer with a nonmagnetic layer interposed between the free magnetic layer and the pinned magnetic layer. The magnetization directions of the pinned magnetic layers of the magnetoresistive elements are the same direction. The magnetoresistive elements form a bridge circuit.

A device for hybrid plasma processing, particularly for deposition of thin films and for plasma treatment of samples, in a plasma reactor with pumping system characterized in that at least one feeder of microwave power (2) is installed in the plasma reactor (1) and connected to a microwave generator (3) for generation of a microwave plasma (4) in contact with at least one hollow cathode (5) in the plasma reactor, where the hollow cathode is powered from a cathode power generator (6). At least one inlet for a processing gas (7) is installed behind the hollow cathode and the gas is admitted into the plasma reactor through the hollow cathode where a hollow cathode plasma (9) is generated. A magnetic element (10) is used for generation of a perpendicular magnetic field (11) and / or a longitudinal magnetic field (12) at an outlet (13) from the hollow cathode.

A pole layer has an end face located in a medium facing surface, allows a magnetic flux corresponding to a magnetic field generated by a coil to pass therethrough, and generates a write magnetic field for writing data on a recording medium by means of a perpendicular magnetic recording system. A shield incorporates: a first layer having an end face located in a region of the medium facing surface forward of the end face of the pole layer along the direction of travel of the recording medium; a second layer disposed in a region sandwiching the pole layer with the first layer; a first coupling portion coupling the first layer to the second layer without touching the pole layer; and a second coupling portion coupling the pole layer to the second layer and located farther from the medium facing surface than the first coupling portion.

A perpendicular magnetic recording head includes a read part disposed on a substrate to read magnetic recording information from a recording medium by a magnetoresistance effect; a write part disposed above the read part to record magnetic information on the recording medium by applying a perpendicular magnetic field, and including a write coil; a heating element disposed between the write coil and the read part; and a heat-dissipating layer disposed between the write coil and the heating element. The heating element generates heat when supplied with current so that the read part is thermally expanded to protrude toward the recording medium. The heat-dissipating layer has a heat dissipation effect.

Provided is a vertical magnetic type MRI apparatus, which can image an arbitrary section of a wide range such as the whole body of a specimen at a high speed in a high sensitivity of even a deep portion of the specimen while suppressing the increase in a channel number. A receiving coil unit (500) is constituted to comprise a bed coil unit (600) having its longitudinal direction aligned with the body axis direction of an inspection object (103), and an upper coil unit (700) mounted removably on the bed coil unit (600). This bed coil unit (600) includes a placing face (601) for placing the inspection object (103), and a plurality of lower sub-coils arranged below the placing face (601). The upper coil unit (700) includes a plurality of upper sub-coils connected with the lower sub-coils. The upper sub-coils are arranged separately on an inner support (20-1) having a flexibility for covering the placing face (601) and an outer support (20-2) having a flexibility for covering the outer side of the inner support (20-1). The upper sub-coils and the lower sub-coils are connected by attaching the upper coil unit (700) to the bed coil unit (600), so that a plurality of kinds of sub-coils can be formed.

A magnetic sensor includes magnetoresistive elements and a soft magnetic body. The magnetoresistive elements have multi layers including a magnetic layer and a nonmagnetic layer on a substrate, and exert a magnetoresistance effect. The soft magnetic body is electrically disconnected with the magnetoresistive elements, and converts a vertical magnetic field component from the outside into a magnetic field component in a horizontal direction so as to provide the magnetoresistive elements with the horizontally converted magnetic field component. The magnetoresistive elements have a pinned magnetic layer having a fixed magnetization direction and a free magnetic layer having a variable magnetization direction. The free magnetic layer is stacked on the pinned magnetic layer with a nonmagnetic layer interposed between the free magnetic layer and the pinned magnetic layer. The magnetization directions of the pinned magnetic layers of the magnetoresistive elements are the same direction. The magnetoresistive elements form a bridge circuit.

A perpendicular magnetic recording head includes a read part disposed on a substrate to read magnetic recording information from a recording medium by a magnetoresistance effect; a write part disposed above the read part to record magnetic information on the recording medium by applying a perpendicular magnetic field, and including a write coil; a heating element disposed between the write coil and the read part; and a heat-dissipating layer disposed between the write coil and the heating element. The heating element generates heat when supplied with current so that the read part is thermally expanded to protrude toward the recording medium. The heat-dissipating layer has a heat dissipation effect.

Measured magnetic field distribution aberrations are decomposed into eigenmode components by means of singular value decomposition, and iron piece arrangements which correspond to each mode are combined and arranged on a shim tray. The eigenmode to be corrected is selected according to the attainable magnetic field precision (homogeneity) and the suitability of the iron piece arrangement. Adjustment can be made whilst being aware of the attainable magnetic field precision (homogeneity), thus incorrect adjustments can also be ascertained and can be automatically corrected during repeated adjustments. If magnetic field adjustment is carried out with the aid of the disclosed method or a device incorporating the disclosed method, the adjustment can be reliably completed during repeated operations. Thus, the device has good magnetic field precision. Furthermore, defective magnets can be detected early by investigating the attainable homogeneity, and the method or device can be adapted to vertical field magnetic devices (open MRIs) and horizontal field MRI magnet devices.

Provided is a thin film magnetic head capable of improving recording performance. The thin film magnetic head comprises a laminate including a main pole layer and an auxiliary pole layer being disposed in a region facing the main pole layer with a non-magnetic layer in between. After magnetic flux generated in a thin film coil is contained in the auxiliary pole layer through the non-magnetic layer, and then is concentrated on a front end neighboring portion of a front end portion in the auxiliary pole layer, the magnetic flux passes through the non-magnetic layer again so as to flow into a front end portion of the main pole layer. A “main magnetic flux incoming route” flowing from a rear end portion to the front end portion in the main pole layer and an “auxiliary magnetic flux incoming route” flowing from the auxiliary pole layer to the front end portion of the main pole layer can be obtained, so an amount of the magnetic flux supplied to a portion of the front end portion of the main pole layer on a trailing side increases. As a sufficient amount of the magnetic flux is supplied to a portion of the front end portion of the main pole layer on the trailing side so that an emitting amount of the magnetic flux increases, thereby a generation intensity and a magnetic field gradient of a perpendicular magnetic field can be obtained.

The invention discloses a high-sensitivity magnetic field measurement method and device and belongs to the field of an electronic measurement instrument. The device comprises a magnetic field measurement chip and a test signal processing method. The chip comprises at least two weakly coupled resonators, a driving electrode, a detection electrode and an outer gate-type structure. The AC current isapplied to the weakly coupled resonators through a driving electrode, and when the chip is placed in a vertical magnetic field, the resonators are subjected to changed Lorentz force to generate simpleharmonic vibration; when the external magnetic field changes, a vibration state of the resonators changes accordingly, moreover, the DC current is applied to the gate-type structure, the gate-type structure is subjected to Lorentz force in the horizontal direction, and the electrostatic negative stiffness between the gate-type structure and the weakly coupled resonators is changed, so energy distribution of a weakly coupled resonator system is severely unbalanced. Two sets of detection electrodes are designed on two sides of an output resonator, single-resonator amplitude difference detectionis achieved, feed-through capacitance interference is eliminated, and high-sensitivity measurement of the weak magnetic field intensity can be achieved by measuring resonator amplitude difference. The device is advantaged in that real-time measurement of the weak magnetic field can be realized, the anti-interference capability is high, and use significance is high.

A perpendicular STT-MRAM comprises apparatus and a method of manufacturing a plurality of magnetoresistive memory element having local magnetic shielding. As an external perpendicular magnetic field exists, the permeable dielectric layers, the permeable bit line and the permeable bottom electrode are surrounding and have capability to absorb and channel most magnetic flux surrounding the MTJ element instead of penetrate through the MTJ element. Thus, magnetization of a recording layer can be less affected by the stray field during either writing or reading, standby operation.

The invention relates to a magnetic field shielding device of a high-temperature superconducting coil, which solves the problem that the current carrying capacity of a high-temperature superconducting coil used as an armature winding in a high-temperature superconducting motor is limited by an additional vertical magnetic field. The magnetic field shielding device comprises a cryostat, a vacuum container, a first magnetic conduction sheet and a second magnetic conduction sheet, wherein the high-temperature superconducting coil is fixed in the cryostat; the cryostat is fixed in the vacuum container; liquid nitrogen is introduced into the cryostat; the first magnetic conduction sheet and the second magnetic conduction sheet are respectively fixed above and below the axial direction of the high-temperature superconducting coil; and the width of the first magnetic conduction sheet and the width of the second magnetic conduction sheet are 1.1-1.5 times of the thickness of the high-temperature superconducting coil. The device of the invention can enable the original vertical magnetic field of the surface of the high-temperature superconducting coil to be reduced by more than 50%, and is used for shielding the vertical magnetic field of the surface of the coil.

Provided is a spin current magnetization rotational element including: a spin-orbit torque wiring that extends in a first direction and is configured to generate a spin current; a first ferromagnetic layer that is laminated in a second direction intersecting the spin-orbit torque wiring and is configured for magnetization direction to be changed; and a first perpendicular magnetic field applying layer that is disposed to be separated from the spin-orbit torque wiring and the first ferromagnetic layer, the first perpendicular magnetic field applying layer being configured to apply an assistant magnetic field assisting a magnetization rotation of the first ferromagnetic layer.

The present invention provides a thin film magnetic head realizing the gradient and the strength of a perpendicular magnetic field increased as much as possible. A main magnetic pole layer is made recede from a write shield layer. As compared with the case where the magnetic pole layer is not receded from the write shield layer, an overlap range in which the main magnetic pole layer and the write shield layer are overlapped one another is smaller. Accordingly, the amount of magnetic flux emitted from the main magnetic pole layer toward a recording medium relatively increases, and the amount of magnetic flux leaked from the main magnetic pole layer to the write shield layer relatively decreases.

Disclosed is a sputtering device capable of forming a film having good coverage with respect to each fine hole with a high aspect ratio formed the surface of a substrate. This device is equipped with: a vacuum chamber (1) in which a substrate (W) is disposed; a cathode unit (C), which is disposed in the vacuum chamber facing the substrate, and which has a holder (2) on one face of which at least one concave part (3) is formed, with a target material (4) having a closed-bottom cylindrical shape being mounted from the bottom side thereof, and to which is attached a magnetic field generation means (6) that generates a magnetic field in the interior space of the target material; an anode shield (8) to which a positive potential is applied; a gas introduction means (12) which introduces a sputter gas into the vacuum chamber; a power supply which supplies power to the cathode unit; a vertical magnetic field generation means comprised of a power supply and a coil (15) which is provided on the wall surface of the vacuum chamber around the reference axis connecting the cathode unit and the substrate; and a control means (16) which controls the on / off of the introduction of the sputter gas from the gas introduction means.