Abstract: A method of magnetizing into a permanent magnet comprises placing magnetizing magnetic field applying means to be adjacent to an object to be magnetized into the permanent magnet, and continuing to apply a magnetizing magnetic field to the object by the magnetizing magnetic field applying means while cooling the object from a temperature of its Curie point or above to a temperature of below the Curie point.

Abstract: A magnetizing coil generates a magnetic field to magnetize a magnet in a magnetizing area, in which a direction of the magnetic field is generally parallel to a magnetization direction of the magnet. A magnetizing yoke holds the magnet and is made of a magnetic material, which exhibits a magnetic potential that is generally equal to a magnetic potential of the magnet in the magnetic field at time of magnetizing the magnet. The magnetizing yoke and the magnet substantially fill a projected area of the magnet in the magnetizing area on each of first and second sides of the magnet that are opposite from each other in the magnetization direction of the magnet in the magnetizing area.

Abstract: The invention relates to a seal arrangement for sealing off at least one radial interspace between at least one bearing ring which can rotate and at least one rotationally fixed bearing ring. The seal arrangement is provided with at least a first carrier, the first carrier carrying at least one resilient seal and being fixed to a rotationally fixed bearing ring, and a second carrier, the second carrier being fixed to the bearing ring that can rotate and carrying at least one encoder. The encoder has an outwardly oriented circumferential surface in the shape of a truncated circular cone.

Abstract: A method of making a permanent magnet body is provided. The method includes providing a first precursor body comprising a plurality of blocks and magnetizing the first precursor body to form a first permanent magnet body. A recoil magnetization pulse may be applied to the permanent magnet body after the magnetization. The precursor body may be heated during magnetization. A power supply containing a battery may be used to energize a pulsed magnet used to magnetize the precursor body.

Abstract: Ferromagnetic bodies, the number of which is n (n is an integer greater than or equal to two), are secured to an inner circumferential surface of a cylindrical yoke. A first gap S1 is provided between ferromagnetic bodies that are adjacent to each other in the circumferential direction. Active magnetic poles, the number of which is m (m is an integer greater than or equal to two), apply magnetic fields to each ferromagnetic body from radially inside. As a result, each magnet has magnetic pole portions the number of which is m. A third gap is provided between each pair of the active magnetic poles that correspond to a common ferromagnetic body. The angular width of the third gap is set greater than a first angular width of the first gap. As a result, all magnetic pole centers are easily arranged at equal angular intervals.

Abstract: An apparatus for magnetizing a wellbore tubular includes a plurality of co-axial magnetizing coils deployed on a frame. The coils are typically deployed about a track on which the tubular may be traversed. Exemplary embodiments may further include a magnetic field sensor disposed to measure the imparted magnetic field along the length of the tubular as it is removed from the track after magnetization. Exemplary embodiments of this invention provide for semi-automated control of tubular magnetization and thereby enable a repeatable magnetic pattern to be imparted to each of a large number of wellbore tubulars.

Abstract: A method and apparatus for enhancing detection of a ferromagnetic threat object by magnetizing the threat object with a separate magnetic field, prior to scanning of the subject by a ferromagnetic-detecting sensor system.

Abstract: A method of magnetizing members of magnetizable material (210) including presenting a magnetizer head to a circular array of the members (210) mounted on a rotor plate (200) of an electrical machine. The magnetizer head includes a circular array of coils (142), each coil (142) being positioned adjacent a respective one of the members (210). A current is supplied to selected juxtaposed pairs of the coils (142) so as to set up a magnetic field. Flux of the field forms a closed loop through the pair of coils (142) and the adjacent pair of members (210), such that uncontrolled flux leakage from this loop is minimized and such that the pair of members (210) are at least partially magnetized.

Abstract: Demagnetizing magnetic media for recording data in a data storage device includes placing the magnetic media in a magnetic field at a first strength, and gradually reducing the magnetic field to a second strength to essentially eliminate net magnetization in the magnetic media.

Abstract: A magnetizing fixture is provided for connection to an electrical power supply. Electrically conductive elements fit within channels connecting top and bottom surfaces of an electrically conductive core. One end of each electrically conductive element connects to a power supply and the other end to an electrically conductive top. An electrically insulating layer coating the channels and top and bottom surfaces of the electrically conductive core electrically isolates the electrically conductive elements from the electrically conductive core.

Abstract: 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.

Abstract: A magnetizing method for tone wheel and apparatus, wherein the method comprises the steps of preparing a ring reinforcement made of magnetic material and attached to an annular body to be magnetized, the ring reinforcement comprising a tubular part and an other part integrally formed with the tubular part; holding the tubular part of the ring reinforcement with a fixture such as a jaw type chuck made of non-magnetic material; and apply an alternate magnetic flux to the annular body while axially rotating the fixing means, keeping one end of a magnetizing yoke approximate to the surface of the annular body, the alternate magnetic flux forming a circular closed loop which passes the one end of the magnetizing yoke and the other end of the magnetizing yoke, via the annular body and the ring reinforcement midway, thereby magnetizing the annular body in a manner that S poles and N poles are alternately formed along its periphery.

Abstract: A high-performance liquid magnetizer including a powerful magnet and a fluid sink. A spiral fluid guide being disposed in the fluid sink. A first opening disposed at the center of the sink and a second opening on one side of the fluid guide. The liquid flowing through the first opening into the fluid guide towards the second opening. The spiral sink extending the magnetization time for the fluid while the revolving direction of the liquid help improve the magnetism field effects.

Abstract: A magnetizing apparatus for tone wheel, comprising a ring-like magnetizing yoke provided with plural wire inserting grooves at a space in its radial direction, and a wire fixed to the magnetizing yoke by sequentially inserting in the grooves, the wire being inserted into each of the grooves adjacent in a manner that it is disposed by turn in and out side of the wheel. The groove is formed as a bent groove comprised of a first groove provided on a ring-like plane of the magnetizing yoke in its radial direction and of a second groove communicating with the first groove and formed on the peripheral face of the magnetizing yoke.

Abstract: A polar-anisotropic ring magnet having magnetization directions in alignment with its normal line at each magnetic pole position and in alignment with its tangential line at each middle position between adjacent magnetic poles, and having a substantially constant angle difference in a magnetization direction between adjacent elements, the elements being obtained by division at an equal angle pitch between the magnetic pole position and the middle position adjacent to the magnetic pole position.

Abstract: An apparatus for magnetizing selected portions of a shaft in a substantially circumferential direction includes a fixture mounted onto the apparatus adapted to receive a shaft to be magnetized, at least one magnetization head, the magnetization head being mounted moveably on the apparatus such that the magnetization head can be moved radially relative to the fixture, a plurality of brushes mounted onto the magnetization head, each brush having a distal end defining an internal diameter sized to circumferentially contact the shaft, the brushes being spring-loaded such that when the magnetization head is moved toward the fixture, each brush engages the shaft with proper pre-load force, and a buss bar, wherein the brushes are electrically connected to the buss bar for even distribution of electrical current to the brushes.

Abstract: A method and apparatus for magnetic field analysis, contributing to not only determining whether or not demagnetization would occur in a permanent magnet but also calculating its magnetic flux density distribution after the demagnetization, is provided. In a magnetic field analysis method according to the present invention, first, permeance coefficients at multiple sites in a permanent magnet and/or numerical values that are dependent on the permeance coefficients are calculated based on B-H curve data of the permanent magnet at a first temperature T1. Next, modified B-H curve data of the permanent magnet, which has been operated at a second temperature T2 that is different from the first temperature T1, are derived for the respective sites based on B-H curve data of the permanent magnet at the second temperature T2 and the permeance coefficients or the numerical values.

Abstract: A system and a method for magnetizing one of a plurality of substantially non-magnetized blocks disposed on a plate of a magnetic assembly used in an MRI device are provided. The system includes first and second arm portions operably coupled together. The system further includes a first electromagnetic coil disposed on a first end of the first arm portion, wherein the first electromagnetic coil is configured to generate a magnetic field that propagates from the first electromagnetic coil through at least one non-magnetized block and the plate and further through the first and second arm portions to magnetize the block.

Abstract: The method of manufacturing rare earth thick film magnet comprising a step of forming an alloy layer of 30-100 ?m thick having a general formula RXBYTMZ on a substrate by a physical deposition process, and a step of heat-treating the alloy layer to form a thick film magnetic layer having R2TM14B phase as a main phase. In the general formula, R is at least one of rare earth elements, B is boron, TM is iron or its alloy partly substituted by cobalt. X is 0.1-0.2, Y is 0.05-0.2 and Z=1-X-Y. Further, the method of the present invention includes a step of laminating a plurality of alloy layers formed on a substrate together with the substrate. A motor comprising rare earth thick film magnet of the present invention is extremely small while obtaining high output.

Abstract: The present invention aims to provide a magnetic sensor provided with a magnetoresistive effect element capable of stably maintaining a direction of magnetization in a magnetic domain of a free layer. The magnetic sensor includes a magnetoresistive effect element provided with narrow zonal portions 11a . . . 11a including a pinned layer and a free layer. Disposed below both ends of the free layer are bias magnet films 11b . . . 11b composed of a permanent magnet that applies to the free layer a bias magnetic field in a predetermined direction and an initializing coil 31 that is disposed in the vicinity of the free layer and applies to the free layer a magnetic field having the direction same as that of the bias magnetic field by being energized under a predetermined condition.

Abstract: A magnetic pole layout method and a magnetizing device for double-wing opposite-attraction soft magnet. A magnetizing conductor is wound on a magnetic conductive tray. A pulse power is fed to the magnetizing conductor to multiple pairs of corresponding first and second magnetizing regions. A magnetizable soft plate is placed on the magnetic conductive tray and magnetized at one time to form multiple pairs of reverse magnetic poles. The magnetized soft plate is then cut into elongated magnet slat in the direction of the formed magnetic poles and then the magnet slat is oppositely folded about a folding line to form a double-wing opposite-attraction soft magnet. The double-wing opposite-attraction soft magnet can ride on a page of a book or a paper along the folding line to clip the page and serve as a bookmark.

Abstract: An apparatus and its method of use enable magnetizing the permanent magnets of an electric motor rotor using the winding coils of the motor stator when the circumferential width of each rotor permanent magnet pole is larger than the circumferential width of each stator winding coil.

Abstract: A method of magnetizing a magnetic sheet, said method able to magnetize a roll sheet conveniently at a high speed and stably including the steps of bringing a cylindrical permanent magnet having N-poles and S-poles multipolar-magnetized alternately along its circumference into contact with one surface of a long magnetic sticking sheet having an axis of easy magnetization oriented in a sheet longitudinal direction so that the sheet longitudinal direction is orthogonal to a shaft of the permanent magnet and multipolar-magnetizing the magnetic sticking sheet along the axis of easy magnetization by rotating the cylindrical permanent magnet due to the magnetic sticking sheet being rolled up, wherein the angle of contact of the magnetic sticking sheet fed to the cylindrical permanent magnet is made 45° or less, and a magnetization apparatus used for the method.

Abstract: The invention relates to a system for pulse magnetizing high-precision magnetic scales. The system comprises a shaped current conductor (1) and a pulse current source (2) that is composed of a capacitor bank (3), a transfer switch (4) and a control unit (5). The compact set-up of the system is the prerequisite for a power circuit that has such a low resistance that the required high pulse currents are obtained at supply voltages of below 60 V. The transfer switch is an H bridge with four switches (7) that contain equal numbers of MOS transistors connected in parallel. The short pulse times that are achieved using the MOS transistors allow the use of shaped current conductors with which magnetized areas can be produced with a very high precision. The inventive system provides a means for saving components, electric power and time by a factor of up to 100.

Abstract: The method according to the invention for demagnetization is effected in two separate steps. Firstly magnetically hard locations, such as weld seams, pressure locations etc., of an object to be demagnetized is pre-treated locally with high fields by way of choke coils in an alternating field. These magnetically hard locations are at least partly demagnetized by way of this. Subsequently the complete demagnetization is effected in a decisive second step. The object remains for a certain time in an alternating field. Now the alternating field is stepped down in that the current in a series oscillation circuit is stepped down in a current-controlled manner with two coils.

Abstract: The present invention relates a magnetizer comprising a permanent magnet having a shape of a hemisphere, a hemispherical shell, or a sphere, and more particularly, to a magnetizer comprising a permanent magnet having a shape of a hemisphere, a hemispherical shell, or a sphere capable of eliminating an overhang of a coil. The present invention provides a magnetizer of a DC motor comprising: a case; a hemispherical permanent magnet provided within the case; a non-magnetic member provided below the hemispherical permanent magnet; and a coil provided to the non-magnetic member.

Abstract: A magnetizer has a pair of magnetism exciters, a magnetism emitting block, a pair of magnets, and a hollow casing. The magnetism emitting block is disposed between the magnetism exciters. Each magnet is disposed between the magnetism emitting block and the corresponding magnetism exciter. The magnetism exciters is made of a high magnetic permeable material. The magnetism emitting block is made of a super magnetic permeable material. Each magnet is made of a permanent magnetic element. The hollow casing is made of a non-magnetic material.

Abstract: A circular magnetizer is disclosed comprising circular insulating inset holding pans of axially disposed wires, each pair carrying a current oppositely directed from the adjacent pair, the insert being disposed within and facing a back iron across a circular gap of sufficient width to allow a circular magnet to be disposed therein and spaced by a gap from the insert and/or back iron. The pan's of wires are arranged to create flux lines which will establish alternating magnetic poles separated by null zones in the magnet.

Abstract: A fluid magnetization straw includes a hollow tube adapted as an outer tube, and at least one magnetizing member. A magnetizing member retaining end and a tube joint are configured at a minimum of one extremity of the outer tube, thereby containing the magnetizing members within the outer tube, facilitating dismantling for cleaning, and connective linkage with other application facilities and devices. At least one magnetic core structured to include a permanent magnet is configured within each of the magnetizing members. Moreover, an annular channel is formed between the magnetizing members and an inner wall of the outer tube thereof. Because of a special assemblage of the permanent magnets of the magnetic core within the magnetizing members, lines of magnetic force from such approach an inner wall in a tangential fashion through a fluid of an annular channel, thereby realizing a good fluid magnetization and ionization effect.

Abstract: The magnetic sensor is fabricated such that a magnetic sensor chip, having a one-chip structure in which MRE bridges and a comparator are included, is mounted onto a lead frame using an adhesive material, and then the magnetic sensor chip mounted on the lead frame is encapsulated by molding in a molded material. The magnetic sensor includes a magnetic-field generating portion formed by magnetizing at least one of the chip mounting member, the adhesive material, and the encapsulating material.

Abstract: A rotor assembly is provided in which the rotor assembly includes a first core portion, wherein the first core portion has at least one first core protrusion, and a second core portion, wherein the second core portion has at least one second core protrusion. The first core portion and the second core portion are configured to be matingly coupled to each other so as to form an assembled rotor assembly. In addition, the rotor assembly includes a number of magnetizable members wherein respective ones of the magnetizable members are coupled to each of the first core protrusions and coupled to each of the second core protrusions. The magnetizable members are adapted to be coupled to a magnetizing fixture prior to mating the first and second core portions so as to magnetize the magnetizable members.

Abstract: Magnetic module (1) for the magnetic anchorage to a ferromagnetic surface of another magnetic, or ferromagnetic module, whose head (3) comprises: a first multipolar magnetic stator (9) that in turn defines a multipolar magnetic anchoring surface (21); and a multipolar magnetic rotor (11), or a second multipolar magnetic stator, coaxial to and facing the first multipolar magnetic stator (9) and equipped with means for orienting the poles of the multipolar magnetic rotor (11), or second multipolar magnetic stator, in series or in parallel with respect to the poles of the first multipolar magnetic stator (9) in order to disable or enable the multipolar magnetic anchoring surface (21) of the first magnetic stator (9).

Abstract: A device is disclosed for activating and deactivating magnetic electronic article surveillance (EAS) markers. In one embodiment, the device includes control circuitry comprising a coil, such as a solenoid-type coil, that provides a magnetic field in one direction and another coil that provides a magnetic field in a substantially perpendicular direction, so that EAS markers that pass through the device are positioned generally in the plane defined by the first and second directions.

Abstract: A method using of a magnetic field to affect residual stress relief or phase transformations in a metallic material is disclosed. In a first aspect of the method, residual stress relief of a material is achieved at ambient temperatures by placing the material in a magnetic field. In a second aspect of the method, retained austenite stabilization is reversed in a ferrous alloy by applying a magnetic field to the alloy at ambient temperatures.

Abstract: A projection type cathode ray tube device includes a panel, a neck, a funnel connecting the panel to one end of the neck, and a stem closing the other end of the neck. An electron gun is housed in the neck for projecting an electron beam toward a phosphor screen on the panel. The neck includes a small-diameter neck portion disposed on its funnel side, a large-diameter neck portion disposed on its stem side, and a neck junction region connecting the small-diameter neck portion and the large-diameter neck portion. A deflection yoke is disposed in a vicinity of a transition region between the funnel and the small-diameter neck portion. A convergence yoke for generating a beam-convergence magnetic field is disposed to extend from the large-diameter neck portion and surround at least a portion of the neck junction region.

Abstract: A polarizing device includes: a polarizing iron core (13) facing to a specified number of permanent magnets (11) among plural unmagnetized permanent magnets (11) arranged at specified intervals circumferentially on a rotor (12); a first coil (15) wound at a position facing to a desired permanent magnet (11a) of the polarizing iron core (13); a pair of second coils (16) each arranged having a specified interval according to the first coil (15) circumferentially on the polarizing iron core (13) and whose direction of the flowing current is different from that of the first coil (15); and a power source (22) for supplying the current to the first and second coils (15, 16), and either of the permanent magnet (11a) and first coil (15) is relatively moved and each permanent magnet (11) is magnetized to form a magnetic pole in turn by the current fed from the power source (22).

Abstract: A compact electric device for magnetizing and demagnetizing metal shafts, screwdrivers, or metallic tools using stored electrical energy. Handheld portable versions are illustrated (see FIGS. 1, 1A, 2, and 2A). The end of a metal shaft, or screwdriver shaft, or other said instrument is placed in (see FIGS. 3 and 6) a receiving cavity or socket (96) which is the hollow center within two coils L1 (80) and L2 (82). The operator of the device chooses either demagnetization or magnetization via a switch (86), presses an action switch (88), and electric current flows through the coils and the rest of the device in a precise way to produce the desired effect of either magnetization or demagnetization. The inserted metal shaft or other said instrument may then be removed from the receiving cavity and is now either magnetized or demagnetized. Electric power is provided by one of three methods: hand-powered push lever AC power generator, DC batteries, or AC/DC converter connected to an external power connector (94).

Abstract: A method of magnetising members of magnetisable material (210) including presenting a magnetiser head to a circular array of the members (210) mounted on a rotor plate (200) of an electrical machine. The magnetiser head includes a circular a array of coils (142), each coil (142) being positioned adjacent a respective one of the members (210). A current is supplied to selected juxtaposed pairs of the coils (142) so as to set up a magnetic field. Flux of the field forms a closed loop through the pair of coils (142) and the adjacent pair of members (210), such that uncontrolled flux leakage from this loop is minimised and such that the pair of members (210) are at least partially magnetised. Current is then passed through a second selected juxtaposed pair of the coils (142) so as to at least partially magnetise the respective adjacent pair of members (210), the second pair of coils (142) and the adjacent members (210) overlapping the first pair by one coil (142) and one member (210) respectively.

Abstract: A magnetic transfer method for magnetically transferring information signals such as servo signals from a master medium to a slave medium, capable of reducing a range of signal missing due to insufficient contact of the two mediums originating from an adhering substance, thus enhancing signal quality. When the master medium bearing an information signal and the slave medium are brought into close contact with each other, a transferring magnetic field is applied thereto, thus magnetically transferring the information signal from the master medium to the slave medium. An elastic member made of a material having an elastic property so as to deform in accordance with a surface shape of the slave medium during contact pressure application and to restore to an original surface shape thereof during release of the slave medium from the master medium can be interposed between a back of the slave medium and a pressing surface of a pressing support member.

Abstract: A method and apparatus for fabricating a rotor for an electric traction motor including forming cavities in the rotor, injecting magnetic material in a portion of the cavities, configuring an electrical winding in a portion of the cavities, and post-magnetizing the magnetic material.

Abstract: A handle for hand tools includes a body and a plug. The body has a front end and a rear end, and a seating hole adapted to hold a hand tool is defined in the front end. An inner cavity is defined in the rear end, and two magnets are mounted in the inner cavity. A magnetizing space and a demagnetizing space are formed between the two magnets and one magnet and a surface of the inner cavity, respectively. The plug is attached to the rear end of the body, and a magnetizing hole corresponding to the magnetizing space and a demagnetizing hole corresponding to the demagnetizing space are defined in the plug. A slot adapted to turn a cup hook is defined in the plug and crosses the magnetizing and the demagnetizing holes. Consequently, the handle has multiple functions.

Abstract: A method of magnetizing a magnetic sheet, said method able to magnetize a roll sheet conveniently at a high speed and stably including the steps of bringing a cylindrical permanent magnet having N-poles and S-poles multipolar-magnetized alternately along its circumference into contact with one surface of a long magnetic sticking sheet having an axis of easy magnetization oriented in a sheet longitudinal direction so that the sheet longitudinal direction is orthogonal to a shaft of the permanent magnet and multipolar-magnetizing the magnetic sticking sheet along the axis of easy magnetization by rotating the cylindrical permanent magnet due to the magnetic sticking sheet being rolled up, wherein the angle of contact of the magnetic sticking sheet fed to the cylindrical permanent magnet is made 45° or less, and a magnetization apparatus used for the method.

Abstract: 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.

Abstract: A permanent magnet radial magnetizer is provided for use in radially magnetizing a workpiece ring. This magnetizer includes a lower magic hemisphere and an upper magic hemisphere which have respective equatorial surfaces in oppositely facing relationship to form a gap wherein a work-piece ring can be radially magnetized. Toroidal flux and pathways pass in the magnetizer and a portion of each such pathway passes through a spherical cavity therein, between one of the hemispheres and the gap.

Abstract: A magnetic transfer method for magnetically transferring information signals such as servo signals from a master medium to a slave medium, capable of reducing a range of signal missing due to insufficient contact of the two mediums originating from an adhering substance, thus enhancing signal quality. When the master medium bearing an information signal and the slave medium are brought into close contact with each other, a transferring magnetic field is applied thereto, thus magnetically transferring the information signal from the master medium to the slave medium. An elastic member made of a material having an elastic property so as to deform in accordance with a surface shape of the slave medium during contact pressure application and to restore to an original surface shape thereof during release of the slave medium from the master medium can be interposed between a back of the slave medium and a pressing surface of a pressing support member.

Abstract: A magnetizing apparatus for magnetizing magnets including an assembly construction for easy maintenance and service which does not need to be completely disassembly for maintenance or service of magnetizing components and which does not require extension recalibration prior to resuming production.

Abstract: A method and system for driving a magnetizing fixture. A driving circuit produces in the conductor of a magnetizing fixture a first current whose magnitude increases substantially linearly with time, then produces a substantially constant current in the same direction, then produces a current in the same direction whose magnitude decreases substantially linearly with time, thereby forming a substantially trapezoidal magnetization current waveform having symmetrical sides. The circuit comprises a first energy storage device for supplying electrical energy to the magnetizing fixture, a second energy storage device for receiving electrical energy from the magnetizing fixture, and a commutator interconnecting the first energy storage device, the second energy storage device and the magnetizing fixture for stopping the flow of electrical energy into the magnetizing fixture from the first energy storage device and starting the flow of energy from the magnetizing fixture into the second energy storage device.

Abstract: A modular magnetic tool system utilizes one or more magnet modules and attachable components to enable selective assembly of a wide variety of magnetic tools. Channels of the magnet modules are connectable in series and in parallel, either by integral connectors or attachable components which can be selectively attached to the magnet modules singularly, in series, or in parallel to form different types of magnetic tools with different functions for different applications.

Abstract: A method and apparatus for fabricating toroidal rings having a magnetization that alternates or changes direction along its azimuthal axis. Such a toroidal ring is made by first placing an unmagnetized toroidal ring into a first magnetization fixture. The first magnetization fixture is operable to magnetize only given regions of the toroidal ring, where the magnetization in those regions is in the same radial direction along its azimuthal axis. The toroidal ring is then placed in a second magnetization fixture that is operable to magnetize only the regions of the toroidal ring the were substantially unmagnetized by the first magnetization fixture. The direction of magnetization by the second fixture is opposite that of the first fixture. The result is a toroidal ring having a magnetization that alternates direction along its azimuthal axis.

Abstract: An imaging apparatus, such as an MRI system, contains at least one layer of soft magnetic material between the yoke and each permanent magnet. This imaging apparatus may be operated without pole pieces due to the presence of the soft magnetic material. The permanent magnets may be fabricated by magnetizing unmagnetized alloy bodies after the unmagnetized alloy bodies have been attached to the yoke.