34results about How to "Fast magnetization" patented technology

A magnetic memory is provided with a memory cell. The memory cell includes a magnetic recording element, an interconnection to generate a radio-frequency current-induced magnetic field and a ground line. The magnetic recording element is provided with a first magnetic layer whose magnetization direction is substantially fixed, a magnetic recording layer whose magnetization direction is substantially reversed by spin-polarized electrons passing through the magnetic recording layer and a first nonmagnetic layer provided between the first magnetic layer and the magnetic recording layer. The interconnection is provided above the magnetic recording element to generate a radio-frequency current-induced magnetic field acting in a direction substantially perpendicular to a magnetization easy axis of the magnetic recording layer. The ground line is provided on a side opposite to the magnetic recording element with respect to the interconnection.

A Halbach array is radially disposed in an environment optimized for efficiency and controlled for efficient generation and use of power in order to generate, establish, and maintain a desired level of rotational energy with enhanced efficiency.

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.

The invention provides non-oriented electrical steel for a variable-frequency air conditioner and a manufacturing method of the non-oriented electrical steel. The non-oriented electrical steel is prepared from the components: less than or equal to 0.0020% of [C], 0.20%-0.50% of [Mn], less than or equal to 0.0025% of [S], less than or equal to 0.020% of [P], 2.80%-3.4% of [Si], 0.20%-1.20% of [Al],less than or equal to 0.0025% of [N], 0.01-0.10% of [Sn], the balance of Fe and inevitable residual elements. The manufacturing method comprises the steps: steelmaking, continuous casting, heating, hot rolling, normalizing, acid pickling, cooling, annealing, cooling and coating. The product thickness is 0.25-0.30 mm, the product iron loss P1.5/50 is less than or equal to 2.15 W/kg, the magnetic polarization intensity J5000 is greater than or equal to 1.65 T, the magnetizing velocity is high, the iron loss is low, the non-oriented electrical steel is suitable for the working conditions of a compressor of the variable-frequency air conditioner, the size and the weight of the variable-frequency air conditioner can be reduced, power consumption is reduced, and resources and energy are saved.

A method of forming a bottom-pinned magnetoresistive element comprising a composite recording structure that includes a first magnetic free layer and a second magnetic free layer containing Ni atoms, separated by an oxide spacing layer. The first magnetic free layer is Ni-free and the first magnetic free layer and the second magnetic free layer are magnetically parallel-coupled. A magnetic STT-enhancing structure is further provided atop the cap layer, wherein the magnetic STT-enhancing structure comprises a first magnetic material layer atop the cap layer and having a perpendicular magnetic anisotropy and an invariable magnetization anti-parallel to the magnetization direction of the reference layer, a second anti-ferromagnetic coupling (AFC) layer atop the first magnetic material layer, and a second magnetic material layer atop the second AFC layer.

The invention discloses a device for rapidly measuring the grain size and magnetic domain wall width of an oriented silicon steel sheet. The device comprises a sample platform and a developing component, wherein the developing component comprises a display window and a contact layer; the display window is a transparent glass plate or a transparent hard plastic plate; a liquid storage cavity used for containing a developing suspension liquid is formed between the display window and the contact layer; the display window is provided with a suspension liquid injection hole used for injecting the developing suspension liquid into the liquid storage cavity and a liquid storage cavity closed hole used for balancing the internal pressure of the liquid storage cavity; the suspension liquid injection hole and the liquid storage cavity closed hole can be opened or closed as needed; a magnet yoke is arranged in the sample platform and is provided with a magnetizing winding; after being electrified, the magnetizing winding is capable of magnetizing the oriented silicon steel sheet put on the sample platform. By virtue of adopting the powder pattern method theory, the device is capable of rapidly measuring the grain size and magnetic domain wall width of the oriented silicon steel sheet.

New prods. are (a) magnetic particles with an external glass surface that is nonporous or has pores with a dia. below 10 nm and (b) ferromagnetic particles with a glass surface.

The invention discloses a novel magnetic fluid bearing which comprises a bearing inner ring, a permanent magnet retainer, a rolling element and a bearing outer ring sequentially arranged from inside to outside. The bearing inner ring is arranged in the bearing outer ring; the permanent magnet retainer is arranged on an outer wall of the bearing inner ring; the rolling element is arranged on the permanent magnet retainer; bearing sealing covers are further arranged on two sides of the magnetic fluid bearing; the upper ends of the bearing sealing covers are connected with an inner wall of the bearing outer ring; the lower ends of the bearing sealing covers are connected with an outer wall of the bearing inner ring; a sealed cavity is formed among the bearing sealing covers, the inner wall ofthe bearing outer ring and the outer wall of the bearing inner ring; and a magnetic fluid is injected into the cavity. In addition, the invention further provides a manufacturing method of the novelmagnetic fluid bearing. The novel magnetic fluid bearing provided by the invention realizes magnetic fluid rolling friction without dry friction, is small in friction force, good in lubricating effectand high in sealing performance so as to be non-impact, stable, silent or noise-lowest during rotating, and is particularly suitable for high-rotating-speed and dusty environments.

A Halbach array is radially disposed in an environment optimized for efficiency and controlled for efficient generation and use of power in order to generate, establish, and maintain a desired level of rotational energy with enhanced efficiency.

A magnetic head includes a coil, a main pole, a write shield and first and second yokes. The first and second yokes are connected to the write shield. The coil includes a main coil portion for driving the main pole, a first sub-coil portion for driving the first yoke, and a second sub-coil portion for driving the second yoke. A magnetic field produced in the main pole by the main coil portion and a magnetic field produced in each of the first and second yokes by the first and second sub-coil portions are in directions opposite to each other.

The invention belongs to the technical field of nuclear power station ferromagnetic thin-walled tube inward-passing electromagnetic nondestructive test and other ferromagnetic thin-walled tube electromagnetic nondestructive test and relates to a ferromagnetic thin-walled tube circumferential AC magnetization magnetic flux leakage detection array probe. The array probe comprises two rows of giant magneto resistive sensors and excitation coils uniformly distributed along a pipe circumferential direction, in each row, the giant magneto resistive sensors and excitation coils are arranged at intervals and the giant magneto resistive sensors and excitation coils in the two rows are staggered. When a pipe is detected, the two adjacent excitation coils in the first row of the coils are excited, then other excitation coils in the first row are orderly excited, after all the coils in the single row are excited, the two excitation coils in the second row close to the excitation coils in the first row are excited and then other excitation coils in the second row are orderly excited. The array probe realizes detection of small caliber sample pipe axial defects.

The invention discloses a permanent magnet comprising the following components in percentage by weight: 8-12.5% of nickel, 55.5-60.5% of cobalt, 1.6-2.4% of aluminum, 0.6-1.3% of titanium and 26-32% of iron. The invention also discloses a manufacturing method of the permanent magnet. The manufacturing method comprises the steps of fully mixing the raw materials in proportion to form a pre-melting material; performing vacuum melting and casting to melt the pre-melting material and cast the pre-melting material into an ingot; forging and rolling the ingot to prepare a section material; drawing the section material to ensure that the section material is greatly deformed; performing texture orientation; performing heat treatment. The permanent magnet has the residual magnetism Br of 1400-1500mT and the coercive force Hc of 2.0-3.2kA/m, has higher residual magnetism and lower coercive force compared with the conventional magnetic material, can be applied to high-precision relays, has the characteristics of rapid magnetization and demagnetization, and can meet requirements for the development of aerospace products.