49results about How to "Increased magnetic sensitivity" patented technology

A microelectromechanical modulating magnetic sensor comprising a base; a magnetic transducer associated with the base that provides an output in response to a magnetic field; a pair of movable flux concentrators positioned to move relative to the magnetic transducer; the pair of movable flux concentrators having a region of high flux concentration between the pair of movable flux concentrators; the pair of flux concentrators moving together in tandem with the distance between the pair remaining substantially constant during movement; support structure for supporting the pair of movable flux concentrators; a power source for causing the movable flux concentrators to move at a frequency within a predetermined frequency range; whereby when the pair of movable flux concentrators is in a first position the region of high flux concentration is in a first location, and when the pair of movable flux concentrators is in a second position, the region of high flux concentration is in a second position; such that as the flux concentrators move from the first position to the second position the intensity of the flux sensed by the transducer is modulated as the region of high flux concentration approaches and recedes from the location of the transducer.

A method for manufacturing magnetic sensing elements for use in magnetic sensors and hard disks. A ferromagnetic layer and a second antiferromagnetic layer are deposited on a nonmagnetic layer having a uniform thickness. The second antiferromagnetic layer is milled to form an indent. The resulting magnetic sensing element has a free magnetic layer reliably set in a single-magnetic-domain state in the track width direction.

A speaker includes a frame, a diaphragm, a cover, a magnetic device, and a voice coil. The cover and the diaphragm are both disposed on a first side of the frame, and the cover covers the diaphragm. The magnet device is disposed on a second side of the frame. The voice coil is disposed on the magnetic loop generated by the magnetic device and integrated with the diaphragm. The magnetic device includes a yoke, a magnet, and a pole piece. The yoke includes a protrusion by bending for the magnet and the pole piece to be mounted upon.

A method and system are presented for directing a charged particle beam towards and away from a sample. The system comprises a lens arrangement having an electrode formed with a beam opening for a charged particle beam passage therethrough; and a magnetic deflector. The magnetic deflector has a magnetic circuit formed by a core part for carrying excitation coils and a polepieces part. The polepieces of the magnetic deflector are in electrical communication with the electrode of the lens arrangement and are electrically insulated from the other part of the magnetic circuit.

The invention discloses a resonance-type magnetoelectric sensor for ferromagnetic material defect detection and a detection method thereof. According to the sensor, a magnetizing coil connected with a frequency-stabilization amplitude-stabilization excitation current source is wound at the middle position of the bottom section of a U-shaped soft magnetic piece; a magnetoelectric element and a permanent magnet are arranged between a left side section and a right side section; the magnetoelectric element consists of two identical magnetostrictive material blocks and a piezoelectric material block; the two magnetostrictive material blocks are respectively and fixedly adhered to the left and right side faces of the piezoelectric material block; the permanent magnet which is fixedly connected with the magnetoelectric element is arranged between the bottom end of the magnetoelectric element and the gap at the bottom section of the U-shaped soft magnetic piece, so that the frequency of an alternating current exciting signal is the same as the resonance frequency of the magnetoelectric element; and moreover, the tops of the left and right side sections of the U-shaped soft magnetic piece are tightly combined with the tested piece and move along the surface of the tested piece, the voltage of a silver electrode layer on the piezoelectric material block is monitored, and if voltage pulse exists, a defect exists at the position where the tested piece is opposite to the magnetoelectric element. An extremely weak magnetic field can be detected, and a magnetic field with moderate intensity can be detected.

A tunneling magnetic sensing element includes: a pinned magnetic layer whose direction of magnetization is pinned in one direction; an insulating barrier layer; and a free magnetic layer whose direction of magnetization changes in response to an external magnetic field. The pinned magnetic layer, the insulating barrier layer and the free magnetic layer are deposited in the named order. A first protective layer composed of a platinum-group element is disposed on the free magnetic layer, and a second protective layer composed of Ti is disposed on the first protective layer.

The invention discloses the synthesis and manufacturing of a novel core-shell nano-carrier with a drug-containing nanocomposite core surrounding with a single crystalline magnetic iron oxide shell. With a unique core-shell configuration, active agents such as drugs and biomolecules encapsulated in the core with an outer single-crystalline thin iron oxide shell can be perfectly protected from environmental damages and in the meantime, eliminating un-desirable release due to un-controllable diffusion of the active molecules from the nanocapsules during the course of delivery in patient's body, before reaching the disease sites.

A corrosion evaluation device for performing a quantitative evaluation of corrosion by measuring a quantity of decrease in the thickness of a magnetic material which is covered by a non magnetic material or a magnetic material which is not covered by a non magnetic material which includes: a magnetic field generating device for generating such a magnetic field that includes the magnetic material in a magnetic path, a Giant Magnet-Resistive effect (GMR) sensor provided with a GMR sensor for detecting a magnetic flux leakage with regard to the magnetic material and converts a change in the magnetic flux into an electrical signal, a thickness reduction calculation portion for calculating a quantity of decrease in the thickness of the magnetic material based on the electrical signal. The corrosion evaluation device precisely performs a quantitative evaluation of corrosion even when the magnetic material, which is to be evaluated, is covered by a non magnetic material.

A magnetic sensor device includes a piezoelectric substrate and an IDT electrode disposed on the piezoelectric substrate. At least a portion of the IDT electrode is made of a ferromagnetic metal and the duty ratio of the IDT electrode is higher than about 0.5 and lower than or equal to about 0.99.

A magnetometer provides a newly designed signal processing circuit that can reduce noise and increase the magnetic sensitivity by means of reducing the noise of GND electrode potential occurred at the timing when the pulse current passes through the magnetic wire. It is characterized by preparing a differential element with a neutral coil electrode, a differential sample holding circuit and a differential amplifier circuit.

A vertical Hall element having an improved sensitivity and reduced offset voltage includes: a second conductivity type semiconductor layer formed on a semiconductor substrate and having an impurity concentration that is distributed uniformly; a second conductivity type impurity diffusion layer formed on the semiconductor layer and having a concentration higher than in the semiconductor layer; a plurality of electrodes formed in a straight line on a surface of the impurity diffusion layer, and each formed from a second conductivity type impurity region that is higher in concentration than the impurity diffusion layer; and a plurality of first conductivity type electrode isolation diffusion layers each formed between two electrodes out of the plurality of electrodes on the surface of the impurity diffusion layer, to isolate the plurality of electrodes from one another.

The invention discloses a pressure/two-dimensional magnetic field single chip integrated sensor, which comprises a first magneto diode MD1, a second magneto diode MD2, a third magneto diode MD3, a fourth magneto diode MD4, a first varistor R1, a second varistor R2, a third varistor R3, a fourth varistor R4, a first load resistor Rx1, a second load resistor Rx2, a third load resistor Ry3, and a fourth load resistor Ry4, wherein the positive electrode of the first magneto diode MD1 and the positive electrode of the second magneto diode MD2 form a differential output, the positive electrode of the third magneto diode MD3 and the positive electrode of the fourth magneto diode MD4 form a differential output, and due to the two differential outputs, two-dimensional magnetic field detection is realized; and the first varistor R1 and the fourth varistor R4 are serially connected to form a first output voltage Vout1, the second varistor R2 and the third varistor R3 are serially connected to form a second output voltage Vout2, and the two output voltages form a differential output to realize pressure detection.

The invention relates to the field of medical diagnostics and can be used in magnetic resonance imaging (MRI) and magnetic resonance spectroscopy (MRS) for increasing the quality of diagnostics of the internal organs of humans and animals. By virtue of a metamaterial, which is used as an electromagnetic field amplifier, being made from a set of advantageously oriented conductors, it becomes possible to spatially rearrange magnetic and electric fields operated at radio frequencies. In particular, in the examined object area, the radio frequency magnetic field is resonantly amplified, which makes it possible to increase the signal/noise ratio in MRI and to obtain better quality images and/or to perform the MRI examinations more quickly as there is no need to accumulate the signal. The proposed design of the metamaterial makes it possible to distance the radio frequency electric field from the area where the examined object is located, therefore enhancing safety of MRI scanning.

A magnetic sensor of the present invention has an elongate element portion having a magnetoresistive effect and a pair of elongate soft magnetic bodies that are arranged along the element portion on both sides of the element portion with regard to a short axis thereof. Each soft magnetic body includes a central portion that is adjacent to the element portion from one end to another end of the element portion with regard to a long axis direction thereof and a pair of end portions that protrude from the central portion in the long axis direction. A width of at least one of the end portions gradually decreases in a direction away from the central portion in at least a part of the end portions in the long axis direction thereof.

The invention relates to a magnetometer and a magnetometer detection method. A laser module is used for emitting a first laser beam. A beam splitting module is arranged on a light path of the first laser beam. A linear polarization module is arranged on a light path of the second laser beam. An acousto-optic modulation module is arranged on a light path of the linearly polarized light beam with adjustable light intensity. A diffracted light selection module is arranged on a light path of the diffracted light. A circular polarization module is arranged on a light path of the first-stage diffracted light. An atomic gas chamber is arranged on a light path of the circularly polarized light. A photoelectric detection module is arranged on a light path of the detection light. The output end of a signal generation module is connected with the control end of the acousto-optic modulation module. The input end of a lock-in amplification module is connected with the output end of the photoelectric detection module and the output end of the signal generation module. The input end of a control module is connected with the output end of the lock-in amplification module, and the output end of the control module is connected with the control end of the signal generation module.

The present invention relates to a magnetorheological fluid composition and a process for preparing the same, which has excellent magnetorheological properties. The fluid composition exhibits change in rheological characteristics in the presence of an external magnetic field. Further, the magnetorheological characteristics of the fluid composition can be optimised for the improved magnetic sensitivity to external magnetic field and negligible magnetic retentivity after removal of the external magnetic field. The sensitivity of the fluid to external magnetic field can be varied by varying the pure iron content of the magnetic sensitive particles composition while, the magnetic retentivity of the fluid (after removal of external magnetic field) can be varied by varying the ferrite alloy content of the same. The fluid composition utilises a magnetic sensitive particles stabiliser or surfactant, which is synthesised from the carrier fluid used in the fluid composition. The fluid composition, prepared according to this process, does not suffer from the rapid settling of the magnetic particles as it utilises a carrier fluid based surfactant, which improves the homogeneity of the fluid composition.