308 results about "Magnetic media" patented technology

An apparatus, in accordance with one aspect of the present invention, includes a magnetic head having an array of transducers, the transducers comprising data elements, at least two first servo readers positioned toward a first end of the array and at least two second servo readers positioned toward a second end of the array. The array is symmetrical about a centerpoint of the array, such that a distance between a center of an innermost one of the first servo readers and a center of the data element closest thereto is the same as a distance between a center of an innermost one of the second servo readers and a center of the data element closest thereto, and such that a distance between a center of an outermost one of the first servo readers and the center of the data element closest thereto is the same as a distance between a center of an outermost one of the second servo readers and the center of the data element closest thereto.

The present disclosure describes aspects of codeword interleaving over magnetic media surfaces. In some aspects, segments of a codeword are spread or interleaved across multiple surfaces of magnetic storage media. Data for one or more codewords may be received by a read / write channel and, for each codeword, a respective index is selected, received, or generated. The index may indicate which sector partitions of the multiple surfaces that segments of one of the codewords are to be written. The data of the codewords can be segmented and then arranged in an interleaver based on the respective index to which the codeword corresponds. The codeword segments are written from the interleaver to sectors of the multiple surfaces of the magnetic media. By so doing, codewords may be spread across multiple surfaces, such that a loss of a portion of a segment track does not prevent readback and decoding of the codewords.

The invention provides a double-magnetic-source micro-nano magnetic medium sealing device and a gas turbine, and relates to the technical field of sealing devices.The double-magnetic-source micro-nano magnetic medium sealing device comprises an outer rotor, an inner rotor, a first sealing assembly and a second sealing assembly; the first sealing assembly and the second sealing assembly are matched with the cavity and comprise first pole shoes, permanent magnets and second pole shoes which are sequentially arranged in the first direction, and the magnetic pole direction of the permanent magnets and the direction where the pivoting axis of the inner rotor is located are the first direction. The polarity of the permanent magnet of the first sealing assembly and the polarity of the permanent magnet of the second sealing assembly are opposite, and the permanent magnet of the first sealing assembly and the permanent magnet of the second sealing assembly are spaced in the radial direction of the inner rotor. Micro-nano magnetic media are adsorbed between the first pole shoe of the first sealing assembly and the first pole shoe of the second sealing assembly and between the second pole shoe of the first sealing assembly and the second pole shoe of the second sealing assembly. According to the invention, the stroke of a magnetic loop is shortened by adopting double magnetic sources, the magnetic field intensity at a sealing gap is increased, and the pressure resistance of a micro-nano magnetic medium under a high-speed working condition is improved.

An apparatus, in accordance with one aspect of the present invention, includes a magnetic head having an array of transducers, the transducers comprising data elements, at least two first servo readers positioned toward a first end of the array and at least two second servo readers positioned toward a second end of the array. The array is symmetrical about a centerpoint of the array, such that a distance between a center of an innermost one of the first servo readers and a center of the data element closest thereto is the same as a distance between a center of an innermost one of the second servo readers and a center of the data element closest thereto, and such that a distance between a center of an outermost one of the first servo readers and the center of the data element closest thereto is the same as a distance between a center of an outermost one of the second servo readers and the center of the data element closest thereto.

The invention relates to a process for forming objects (1) that are intended to be placed in a culture medium, the process comprising: a) forming liquid droplets (12) from a sol-gel solution (2); b) depositing the liquid droplets on a receptacle (10); c) deforming the droplets deposited on the receptacle (10); d) solidifying the droplets by gelling and drying, so as to form solid objects; e) extracting the solidified objects from the receptacle (10); the process being characterized in that the sol-gel solution comprises particles that are sensitive to a magnetic field.

The invention provides a multi-waveform magnetic field generating device for magnetic hyperthermia. The multi-waveform magnetic field generating device comprises a power supply module, a BUCK voltage regulating circuit, a multi-waveform signal generating circuit, a power amplifying circuit, a series resonance inverter circuit, an induction coil, a water cooling module, a temperature acquisition module, a DSP microprocessor and a TFT display screen. The power supply module is combined with BUCK to supply power to the device; the multi-waveform signal generation circuit, the power amplification circuit and the series resonance inverter circuit are used for generating an alternating magnetic field to act on a magnetic medium to generate a heat effect and realize magnetic hyperthermia; the water cooling module is used for reducing the temperature of the induction coil; the temperature acquisition module acquires temperature data of a treatment area and performs output control on the Buck voltage regulation circuit by using the DSP microprocessor so as to regulate the output power of the power amplification circuit powered by the BUCK voltage regulation circuit and realize intelligent temperature control of the magnetofluid; the problems that in the prior art, a magnetic field generation device is single in induction waveform and poor in heat generation effect are solved.

The invention relates to a magnetic medium box device and method for analyzing a high-gradient magnetic separation capture mechanism, and belongs to the technical field of high-gradient magnetic separation process mechanism research. The magnetic medium box device comprises a cooling chamber and a magnetic medium stack, the magnetic medium stack is formed by vertically stacking a plurality of freely detachable magnetic medium units, the cooling chamber is a hollow annular cavity, and a liquid nitrogen inlet and a liquid nitrogen outlet are formed in the top of the cooling chamber. When the magnetic medium box device is used for analyzing a high-gradient magnetic separation capturing mechanism, firstly, a plurality of magnetic medium rods and positioning pieces on the two sides of the magnetic medium rods form magnetic medium units, and after a plurality of magnetic medium units are placed into an inner ring space of a cooling chamber, the magnetic medium box device is assembled; putting the magnetic medium box device into a high-gradient magnetic separator, starting a magnetic separation test, after the test is finished, keeping a magnetic field unchanged, introducing a proper amount of liquid nitrogen into the cooling chamber through a liquid nitrogen inlet, disconnecting the magnetic field after particles captured on the surface of the magnetic medium are completely frozen, taking out the magnetic medium box device, and sequentially disassembling the magnetic medium units, and the particles captured on each magnetic medium rod are independently washed with clear water, collected, detected and analyzed. By means of the indirect heat transfer effect of the liquid nitrogen cooling chamber, rapid freezing and accurate collection of particles on the magnetic medium are achieved, and the device and method which are easy to operate are provided for high-gradient magnetic separation capture mechanism analysis experiments.

The invention belongs to the technical field of mechanical transmission, and provides a permanent magnet coupling three-dimensional magnetic field modeling method based on a molecular current theory, which comprises the following steps: firstly, according to a molecular current viewpoint, enabling a uniformly magnetized permanent magnet to be equivalent to a form that a plurality of current loops are tightly wound on the surface of the uniformly magnetized permanent magnet; secondly, correcting the Biosaval law, and solving the magnetic field intensity of an equivalent close winding current ring on the surface of the permanent magnet in vacuum; then, considering the influence of a soft magnetic medium on the magnetic induction intensity, and solving the magnetic induction intensity contribution of a single permanent magnet to a geometric space according to a magnetic medium constitutive equation; and finally, solving the total magnetic induction intensity distribution of the magnet array. According to the permanent magnet coupling three-dimensional magnetic field modeling method based on the molecular current theory, a simple and efficient magnetic field calculation method is provided for the field of optimization design and application of permanent magnet couplings.

The invention relates to a pressure and temperature multifunctional sensor for energy collection and a manufacturing method thereof, the pressure and temperature multifunctional sensor adopts a double-layer composite structure: an upper wire coil layer is composed of a liquid metal coil embedded in a PDMS substrate, silver paint and a wire connected with the silver paint, and a lower magnetic fiber network layer is formed by weaving magnetic liquid crystal elastomer LCE composite fibers; the two are structurally integrated through a bonding layer; a coil conductive loop in the upper wire coil layer is formed on the surface of the PDMS substrate through a direct-writing printing technology, and packaging protection is completed through secondary pouring of PDMS; the LCE composite fiber takes an LCE hollow fiber tube as an external carrier, magnetorheological fluid is filled in the LCE composite fiber to serve as a magnetic medium, and two ends of the LCE composite fiber are sealed and packaged by adopting a compound of neodymium iron boron magnetic particles and PDMS (Polydimethylsiloxane). The sensor provided by the invention not only can realize pressure and temperature sensing, but also can be used as an energy collection device, provides a new solution for sustainable development of wearable equipment and sensors, and has a wide application prospect.

Methods and apparatus of identifying a substrate suitable for a magnetic medium of a data storage device configured for magnetic recording are described. In an aspect, the method includes determining a roll-off value, a ski-jump value, and a radial-waviness value, each associated with an outer diameter (OD) edge region of a data surface of the substrate, and determining a calculated minimum fly height between a slider of the data storage device and a data surface of the substrate in the OD edge region based on the roll-off value, the ski-jump value, and the radial-waviness value. The method further includes comparing the calculated minimum fly height and a fly height threshold, and determining whether to utilize the substrate for the magnetic medium based on the comparison of the calculated minimum fly height and the fly height threshold.

A device component has a magnetorheological brake device with a static holder and with two brake components. A first brake component is rotationally fixedly to the holder and extends in an axial direction. A second brake component has a hollow, rotary part which is rotatable about the first brake component. An encircling gap between the first and second brake components is filled with a magnetorheological medium. The first brake component has a core of magnetically conductive material which extends in the axial direction. An electrical coil is wound axially around the core and spans a coil plane. A magnetic field of the coil extends transversely through the first brake component. A maximum outer diameter of the electrical coil in a radial direction within the coil plane is greater than a minimum outer diameter of the core in a radial direction transversely to the coil plane.

The utility model discloses a vertical magnetic cyclone precipitation combined device which comprises a secondary precipitation tank and a cyclone separator arranged in the secondary precipitation tank, the upper part of the cyclone separator is a cylindrical barrel, the lower part of the cyclone separator is of a conical structure, and an underflow outlet is formed in the bottom of the conical structure; a rotary magnetic system capable of generating spiral downward magnetic field force is arranged outside the cylindrical barrel; the inner wall of the cylindrical barrel is provided with a spiral magnetic conductive piece used for magnetism gathering and current stabilizing. A central overflow barrel is mounted in the cylindrical barrel, and an overflow discharge hole communicated with the secondary precipitation tank is formed in the top of the central overflow barrel; the side surface of the cylindrical barrel is connected with a tangential mud inlet pipe which is connected with a water inlet; a water outlet is formed in the top of the secondary precipitation tank. The device can be used for recovering a magnetic medium in magnetic coagulating sedimentation or a magnetic biofilm carrier in a magnetic biochemical system. The device has the characteristics of reasonable structural design, low energy consumption and wide application range, and is high in separation and recovery efficiency of the magnetic medium and the magnetic biofilm carrier.

The invention discloses a vertical ring magnetic separation device adopting a saddle-shaped coil and a magnetic separation method of the vertical ring magnetic separation device, and relates to the technical field of mine metallurgy, the vertical ring magnetic separation device comprises an integral support, a magnet system, a rotating ring, a feeding assembly and a discharging assembly, and the magnet system is fixedly arranged on the integral support and surrounds part of the rotating ring; the magnet system comprises at least one saddle-shaped coil, and the arc-shaped face, facing the rotating ring, of the saddle-shaped coil is matched with the ring face of the rotating ring. The saddle-shaped coil is adopted, the arc-shaped working face of the saddle-shaped coil is matched with the height space of the annular contour of the rotating ring, magnetic field distribution is fundamentally optimized, magnetic field energy is highly concentrated and accurately acts on a magnetic medium filled in the rotating ring, the field intensity far exceeding that of a traditional runway-shaped coil can be obtained, and the collecting capacity of weak magnetic minerals is remarkably improved; the optimization of the magnetic field further reduces the dependence on the magnetic conductive yoke, so that the overall structure weight of the magnet system is reduced, and the cost is reduced.

Mode hop detection is provided. A device includes circuitry to receive, from a reader element an indication of one or more properties of a magnetic medium detected by the reader element. The device includes circuitry to determine an envelope of the signal. The device includes circuitry to adjust, responsive to the envelope, a current provided to a laser configured to heat the magnetic medium.

The present invention provides a PUR hot melt adhesive for textile use and a preparation method thereof, wherein the adhesive comprises the following components in parts by weight: 88-102 parts of a polyurethane prepolymer, 10-20 parts of a hydroxy acrylate, 6.5-10 parts of a chain extender, 3-9 parts of a light-activated latent curing agent, 8-11 parts of a plasticizer, 1-2.8 parts of a cross-linking agent, 3-6 parts of a tackifier, 0.1-1 parts of a stabilizer, 0.01-0.03 parts of dibutyltin dilaurate, 1.3-2.2 parts of a photoinitiator, and 0.5-0.8 parts of a magnetic medium type absorbent; the polyurethane prepolymer is prepared by reacting a polyester polyol or a polyether polyol with a diisocyanate. The chain extender, the magnetic medium type absorbent, the plasticizer, the cross-linking agent, the tackifier, the stabilizer, and the photoinitiator are all selected from specific components or mixtures. The preparation method comprises generating a polyurethane prepolymer, preparing a polyurethane elastomer, forming a stable adhesive system, and finally preparing a PUR hot melt adhesive. The adhesive has good bonding properties and water-resistant properties and is suitable for the lamination of textile fabrics.

The present disclosure generally relates to a magnetic media drive comprising a magnetic recording head. The magnetic recording head comprises a main pole disposed at a media facing surface (MFS), a shield disposed at the MFS, a spin blocking layer disposed between the shield and the main pole, at least one non-magnetic layer disposed between the main pole and the shield, the at least one non-magnetic layer being disposed at the MFS, and at least one spin orbit torque (SOT) layer disposed over the at least one non-magnetic layer, the SOT layer being recessed a distance of about 20 nm to about 100 nm from the MFS. A ratio of a length of the SOT layer to a thickness of the SOT layer is greater than 1. The at least one SOT layer comprises BiSb.

The invention relates to the technical field of microwaves and antennas, particularly discloses a miniature ultra-wideband planar helical antenna based on a magnetic medium, and aims to solve the problem that indexes such as miniaturization, ultra-wideband, high gain and circular polarization are difficult to consider in the design of an existing helical antenna. The helical antenna structure comprises an antenna radiation unit, a metal stepped shielding inner cavity, a Balun feed structure, a feed connector, a circular metal reflection back cavity and a magnetic dielectric material. According to the invention, the magnetic dielectric material is arranged below the radiation circuit so as to regulate and control the surface current distribution at the tail end of the circuit and centrally regulate and control the size and direction of an electromagnetic field vector in a cavity, so that the reduction of the transverse and longitudinal dimensions of the antenna is effectively realized; the impedance matching bandwidth and the axial ratio bandwidth of the miniaturized antenna can be improved while the high gain of the antenna is kept, the extremely high impedance matching bandwidth can be realized, and the excellent circular polarization characteristic is kept in the bandwidth range.

The utility model discloses a medium box for fine fraction separation of a vertical ring high-gradient magnetic separator, which belongs to the technical field of magnetic mineral separation equipment and comprises two fixing plates. At least one supporting plate is located between the two fixing plates. The two ends of the multiple reinforcing medium rods are connected with the fixing plate and penetrate through the supporting plate. The multiple reinforcing medium rods are distributed along the edge and form a medium containing cavity with the fixing plate. A plurality of spaced medium rods are positioned in the medium accommodating chamber, and two ends of the spaced medium rods are connected with the fixing plate and penetrate through the supporting plate; the diameter of the spacing medium rod is not greater than that of the reinforcing medium rod; the magnetic medium is embedded in a gap between the adjacent interval medium rods; the reinforcing medium rods and the spacing medium rods penetrate through the supporting plate and are fixedly connected with the fixing plate, so that the structural strength can be improved; the reinforcing medium rods, the spacing medium rods and the magnetic medium are arranged in order, so that a compact mineral separation medium can be formed, and the recovery rate of fine-fraction minerals is increased; and the magnetic medium can be conveniently pulled out and cleaned, so that the cleaning difficulty is reduced.

The invention provides a high-pressure high-gradient magnetic separator and a magnetic separation method thereof, and relates to the technical field of magnetic separation. The exciting coil is embedded into the inner wall of the inner cavity of the magnet yoke; the high-pressure separation cavity comprises an outer cylinder body, an inner cylinder body and a magnetic medium, the outer cylinder body is fixedly arranged in the inner cavity, the inner cylinder body is embedded into the outer cylinder body in a sliding mode, and the magnetic medium is arranged in the inner cylinder body; and the ore feeding, water feeding and gas feeding device is communicated with the inner barrel through a pipeline, is used for inputting to-be-magnetically separated ore pulp containing high-pressure gas into the inner barrel, and can be connected with the discharging container for circulating high-pressure magnetic separation. The high-gradient magnetic separation device can be used for developing high-gradient magnetic separation test research under the high-pressure condition, liquid-solid ore pulp in a traditional magnetic separation cavity is changed into high-pressure gas-liquid-solid mutual soluble ore pulp, and the adsorption effect among particles under the high-gradient magnetic field effect is weakened through Van der Waals repulsive force of high-pressure gas dissolved in the high-pressure gas-liquid-solid mutual soluble ore pulp; the method can be used for efficient separation of micro-fine particle level weak magnetic minerals.

The invention provides a heat dissipation type magnetic medium sealing device, and relates to the technical field of sealing devices.The heat dissipation type magnetic medium sealing device comprises a shell, a rotating shaft and a magnetic sealing assembly; the rotating shaft is pivotally connected with the cavity, at least one end is located outside the shell, the rotating shaft is provided with a heat exchange channel, and at least part of the heat exchange channel is located outside the shell; the magnetic sealing assembly is matched with the cavity and sleeves the rotating shaft, a sealing gap is defined between the inner circumferential surface of the magnetic sealing assembly and the outer circumferential surface of the rotating shaft, and a magnetic medium is adsorbed in the sealing gap; the heat exchange channel is arranged adjacent to the sealing gap, a phase change medium is arranged in the heat exchange channel, the phase change medium has a first state and a second state, and the phase change medium can be switched between the first state and the second state so as to exchange heat with the magnetic sealing assembly. Magnetic medium sealing heat exchange can be enhanced, the heat dissipation effect is good, and the linear speed and the working temperature of magnetic medium sealing can be improved.

The invention discloses a dredging device for an ore unloading water pipe of a vertical ring high-gradient magnetic separator, which belongs to the technical field of flushing ore unloading equipment, and comprises a separation rotating ring capable of rotating, and a magnetic medium box is arranged on the circumferential surface of the separation rotating ring; a plurality of water spraying holes are formed in the bottom of the ore discharging water pipe; the movable cross beam is arranged in the ore unloading water pipe, a plurality of conducting columns are arranged on the movable cross beam, and a high-pressure air channel is formed in the movable cross beam; an air injection hole communicated with the high-pressure air channel is formed in the conduction column, and a first valve is arranged between the air injection hole and the high-pressure air channel; the movable cross beam can move between a first position and a second position; at the first position, the conducting column is separated from the water spraying hole; at the second position, the conducting column extends into the water spraying hole, and the first valve is in an open state; the conducting column can extend into the water spraying hole to directly eject impurities in the water spraying hole, meanwhile, ore unloading water quickly flows through the gap, high-pressure gas is sprayed out of the gas spraying hole, and the impurities on the inner wall of the water spraying hole are thoroughly removed through the combined action of the two.

To provide a magnetic head with improved spintronic devices.SOLUTION: The present invention relates to a magnetic recording head having a local or non-local SOT spintronic device for a magnetic medium, such as a magnetic media drive. In the case of the magnetic recording head having a local SOT spintronic device, a main pole, a shield, a buffer layer disposed on the main pole, a spin Hall layer disposed on the buffer layer, and an intermediate layer disposed on the spin Hall layer are included, and the buffer layer is made of a predetermined material. In the case of the magnetic recording head 1300 having a non-local SOT spintronic device, a main magnetic pole 1302, a shield 1304, a spin blocking layer 1310, a non-magnetic layer, and a spin-orbit-torque (SOT) layer 1308 are included, and the SOT layer is recessed from a medium facing surface (MFS) by a distance of about 20 nm to about 100 nm. The ratio of the length of the SOT layer to the thickness of the SOT layer is greater than 1. The SOT layer consists of BiSb.SELECTED DRAWING: Figure 10A

The invention discloses an integrated treatment process for heavy metal wastewater. The integrated treatment process comprises the following steps: step 1, pretreatment; 2, biological agent treatment; step 3, air flotation and magnetic separation; step 4, precipitation and separation; step 5, post-processing; step 6, magnetic medium separation and recovery; wherein in the second step, a biological agent adding unit and a hydrolysis reaction unit are included, the biological agent treatment unit comprises a stirrer, an agent adding ring and a guide cylinder, the stirrer comprises a stirring motor and a stirring impeller, the stirring impeller is connected with the stirring motor and inserted into the guide cylinder, and the agent adding ring is connected with the stirring impeller and synchronously rotates with the stirring impeller; the flow guide cylinder is provided with a turbulent flow ring, the turbulent flow ring comprises a ring body and cutting teeth, the ring body is installed in the flow guide cylinder, and the cutting teeth are arranged on the ring body. Compared with the prior art, the purposes of efficient treatment, stable water outlet, land occupation and cost saving and convenience in installation and extension are achieved.

A magnetic medium is described which includes a thin film magnet structure formed of a ferromagnetic alloy or compound. The thin film magnet structure includes one or more ferromagnetic domains and is coupled to one or more optical structures. Each of the one or more ferromagnetic domains have a magnetization that is switchable between two or more states. Each of the one or more optical structures is configured to increase absorbance of light at a target wavelength in the thin film magnet structure, such that in response to illumination of a ferromagnetic domain with continuous-wave light including the target wavelength, that ferromagnetic domain undergoes all-optical magnetic switching.

A lubricant for magnetic media is synthesized using click chemistry. In one aspect the lubricant is according to general formula (I):where Rc is a fluorinated or non-fluorinated divalent linking segment; where each Re1 and Re2 is a click linker moiety that can be triazole or sulfone; n is from 2 to 50; where each Rb1 and Rb2 is an optionally non-fluorinated divalent linking segment optionally comprising at least one least one first anchoring functional group engageable with a protective overcoat of a magnetic recording medium; and where each of Rv1 and Rv2, when present, independently comprises a moiety having at least one second anchoring functional group engageable with the protective overcoat of the magnetic recording medium. The click linker moiety may also functional as an anchoring functional group.

The magnetic separation column comprises an ore feeding hopper, a tailing overflow groove, a separation column body, an electromagnetic system, a concentrate opening and a water feeding pipe, the ore feeding hopper is arranged at the top of the separation column body, the lower portion of the separation column body is communicated with the separation column body, the tailing overflow groove is formed in the upper portion of the separation column body, the concentrate opening is formed in the bottom of the separation column body, and the electromagnetic system is arranged outside the separation column body in a sleeved mode. The water supply pipe is inserted into the lower part of the sorting column; the device is characterized by further comprising a magnetism gathering medium body, the magnetism gathering medium body is fixedly arranged in the separation column, and the top of the magnetism gathering medium body corresponds to the uppermost electromagnetic system. According to the utility model, the phenomenon that fine-particle magnetite moves upwards along with rising water flow and enters tailings to cause black running is effectively avoided, so that the recovery rate of iron ore concentrate is increased, and the grade of the tailings is reduced.

The present invention relates to a piston dry superconducting magnetic separator and a dry magnetic separation and impurity removal method thereof, wherein the piston dry superconducting magnetic separator comprises a piston-magnetic medium structural assembly, a precision tube assembly, and a superconducting magnet; the precision tube assembly passes through the superconducting magnet and is relatively fixed in position; a piston-magnetic medium structural assembly capable of reciprocating along an axial direction is installed in the precision tube assembly; three groups of inlets and outlets are provided on the precision tube; the piston-magnetic medium structural assembly is provided with two separation zones along the axial direction, and the two separation zones are connected together; a separation zone central axis is provided in the separation zone, piston flanges are provided at both ends of the separation zone central axis, and magnetic medium is filled between the two piston flanges; a sliding fit is formed between the outer wall of the piston flange and the inner wall of the precision tube. The dry magnetic separation and impurity removal method, namely, using the above-mentioned piston dry superconducting magnetic separator to dryly remove impurities from high-purity powder, shortens the impurity removal process of the high-purity powder, and improves production efficiency.

The present disclosure generally relates to a magnetic recording head for a magnetic media drive. The magnetic recording head comprises a main pole, a waveguide disposed adjacent to the main pole, a near field transducer (NFT) coupled between the main pole and the waveguide at a media facing surface (MFS), a thermal shunt disposed on the NFT, the thermal shunt being recessed from the MFS, and a stable material disposed on the NFT at the MFS. In some embodiments, the stable material is wedge-shaped or triangular-shaped. In another embodiment, the stable material comprises a first portion and a second portion, where the first and second portions may each by linear, or where the first portion is triangular-shaped and the second portion is square-shaped. The stable material may be in contact with the thermal shunt, or spaced from the thermal shunt.