14 results about "Magnetoelectric effect" patented technology

The invention provides a flexible magnetoelectric piezoelectric switching device, a wearable patch and a preparation method and application of the wearable patch, and relates to the field of sensors. The device comprises a flexible film substrate, a transducer and a sensor, the transducer, the flexible thin film substrate and the sensor are sequentially coupled to form the flexible magnetoelectric piezoelectric switching device. According to the flexible magnetoelectric piezoelectric switching device prepared by the invention, the piezoelectric characteristic of the flexible film substrate is combined with the magnetoelectric effect of the MENPs, so that the device can accurately control the conversion between the magnetization state and the potential, and ultrahigh controllability is realized.

The invention belongs to the technical field of biomedical materials, and particularly relates to application of a HAp-MXene nano composite material in regulation and control of an osteogenesis immune microenvironment. The HAp and MXene nanocomposite is obtained by combining hydroxyapatite nanorods and MXene nanosheets, the HAp and MXene nanocomposite is interfered by adjusting an external magnetic field, so that the HAp and MXene nanocomposite shows one effect of regulating and controlling polarization of macrophage M1 or macrophage M2; then, the HAp-MXene nanocomposite is implanted into a bone defect area, and in the initial stage of the operation, the magnetoelectric effect of MXene is excited by applying a rotating magnetic field, polarization of M1 type macrophages is promoted, proinflammatory factors are generated, and bacterial infection is inhibited; then, in the middle stage, through removing a magnetic field, releasing calcium ions, promoting polarization of the M2 type macrophages, relieving inflammatory response and promoting bone regeneration, programmed regulation and control of the macrophages are achieved in different repair stages.

The invention relates to the technical field of detection sensors, and provides a high-sensitivity displacement sensor based on a magnetoelectric effect and a multi-dimensional sensing device.The high-sensitivity displacement sensor based on the magnetoelectric effect comprises a magnet yoke sleeve which is provided with a containing space, and an air gap is formed between the magnet yoke sleeve and a detected object; the magnetoelectric material assembly is configured in the accommodating space; the excitation coil provides active magnetic field excitation so that a closed magnetic circuit can be formed between the magnet yoke sleeve and a detected object or a closed magnetic circuit can be formed between the magnet yoke sleeve and a follow-up component arranged on the detected object. And when the detected object generates displacement, the air gap is changed, so that the magnetic field intensity acting on the magnetoelectric material assembly is changed, and the magnetoelectric material assembly generates an electric signal corresponding to the magnetic field intensity. According to the invention, high-sensitivity sensing detection of displacement is realized.

This invention discloses a magnetically tuned thin-film bulk acoustic resonator (FBAR), its fabrication method, and its applications. The FBAR comprises a first electrode, a piezoelectric material layer, and a second electrode stacked sequentially. The second electrode comprises at least one alternating layer of a first material layer and at least one layer of a second material layer, wherein the at least one first material layer is a magnetostrictive thin film, and the magnetostrictive thin film and the piezoelectric material layer cooperate to form a magnetoelectric heterojunction. This invention provides a magnetically tuned thin-film bulk acoustic resonator that uses a magnetically stretched composite thin film as the upper electrode. Utilizing the magnetoelectric effect of the magnetic and piezoelectric materials, the resonant frequency of the FBAR can be adjusted in the low-frequency, mid-frequency, and even high-frequency range under the influence of a magnetic field.

A magnetoelectric storage element based on a BZT-BCT ferroelectric / ferromagnetic composite film and a preparation method thereof, belonging to the field of semiconductor integrated circuit technology, wherein the storage unit uses a laminated magnetoelectric film as the medium, and an external electric field changes the polarization state of the ferroelectric layer, thereby affecting the magnetization state of the ferromagnetic layer through the magnetoelectric coupling effect to realize electric field control of the resistance state. The writing medium is the electric field, and the storage medium is the resistance state of the ferromagnetic layer. The change of the resistance state is based on the BZT-BCT and Fe 65 Co 35 The present invention adopts BZT-BCT with large piezoelectric coefficient and Fe with large magnetostrictive effect to realize the magnetoelectric effect of stress-strain mechanism. 65 Co 35 Fabricating memory elements in layers facilitates the electroresistance switching effect, offering advantages over traditional non-volatile memory, such as low power consumption and faster read / write speeds. Furthermore, the layered composite thin film devices are fabricated using magnetron sputtering, a simple process compatible with semiconductor technology.

The utility model discloses an oil pipeline cleaner based on the magnetoelectric effect and a pipeline. The pipeline cleaner comprises a shell, and a control device is arranged in the shell; the circumference of the detection device is arranged on the inner wall of the shell and is in signal connection with the control device; the cleaning device is of a spherical structure and is matched with the detection device, a plurality of rectangular pyramid convex nails are arranged on the outer wall of the cleaning device, and a magnetic unit is arranged in the cleaning device and is used for generating a magnetic signal source. When the pipe cleaner is blocked by oil dirt which is difficult to clean or passes through a dirt accumulation area, parameters such as intensity and frequency of magnetic signals can be correspondingly changed due to change of the environment in a pipeline, the detection device can accurately capture the change of the magnetic signals in real time, the control device analyzes and processes the detected signals, and the detection result is displayed. The specific position of blockage can be accurately judged, the continuity of petroleum conveying is guaranteed, and a large amount of cost is saved for enterprises.

The utility model discloses a magnetic knob based on a Hall element, and relates to the technical field of induction cooker appliances. The knob turncap is installed on the knob base, the knob base is arranged above the panel, a magnet hole and two sensor holes are formed in the upper end of the support, a second positioning magnet is installed in the magnet hole, Hall sensors are installed in the two sensor holes, the support is arranged below the panel, and the second positioning magnet and the first positioning magnet are attracted; according to the utility model, the magnetoelectric effect between the magnet and the Hall sensor is utilized to realize the control of an electric appliance and the setting of parameters, when the magnet is close to or far away from the Hall sensor, the Hall sensor can output a square wave signal, and the man-machine interaction is realized through the processing of the square wave signal; the magneto-electric effect is separated from objects, so that the problem of panel trepanning is solved, and the completeness and the sealing performance of the panel are ensured; and compared with wireless communication or detection processing on touch variation, the stability is high, and the development difficulty is lower.

The invention relates to the technical field of medical instruments, and discloses a nasointestinal tube system and a positioning and safety monitoring method thereof, and the system comprises a catheter body, a positioning beacon, a multi-mode positioning module, an integrated sensing module and an intelligent decision terminal. The positioning beacon emits an ultrasonic positioning signal under the excitation of an alternating magnetic field based on a magnetostriction or magnetoelectric effect; the multi-mode positioning module works cooperatively with an ultrasonic receiving array through a magnetic field excitation unit, and real-time three-dimensional coordinates of the tail end of the catheter are calculated by a positioning calculation processor; the integrated sensing module monitors the pressure and the pH value of fluid in the pipe cavity in real time; the intelligent decision-making terminal carries out fusion processing on the positioning data and the sensing data, and dynamic mapping of a catheter path, abnormal event recognition alarm and prospective early warning of complications are achieved in sequence. The positioning and safety monitoring method corresponds to the system. The real-time, accurate and integrated intelligent monitoring and safety management of the position and the function of the nasointestinal tube, especially the nasointestinal tube for children in the indwelling period are achieved.

The invention relates to the field of polymer nano composite materials, in particular to a polymer nano composite material with a magnetoelectric effect and a preparation method of the polymer nano composite material with the magnetoelectric effect, raw materials of the composite material comprise vanadium, selenium, carboxyl diazonium salt and polyvinylidene fluoride, and the orientation factor of the composite material is 0.55-0.71. Based on the total mass of polyvinylidene fluoride in the composite material, the content of the beta phase is 78-86%, and the composite material has good ferromagnetic performance, ferroelectric performance and mechanical strength.

The invention discloses an electromagnetic imaging method, device and equipment based on a composite excitation magnetic field and a medium, and relates to the technical field of biomedical engineering.The method comprises the steps that under work of a uniform magnetic field and a symmetrical zero magnetic field generated through alternate excitation, signal collection is conducted on a measuring electrode on a vascular tissue phantom, and a periodic initial voltage signal is obtained; preprocessing the initial voltage signal to obtain a voltage digital signal; according to the voltage digital signal, the upper computer is used for analyzing the corresponding relation between the voltage digital signal and the blood flow in the blood vessel tissue phantom, and blood vessel image representation of the blood vessel tissue phantom is obtained. The method is suitable for blood flow measurement and imaging scenes of the magnetoelectric effect of arterial blood flow.

The invention discloses a cobalt terbium alloy modified gallium nitride nanowire heterojunction ultraviolet detector and a preparation method thereof, and belongs to the technical field of ultraviolet light detection. The detector comprises a gallium nitride nanowire array located on a substrate, one end, far away from the substrate, of the gallium nitride nanowire array is loaded with cobalt terbium alloy through a magnetron sputtering method, and a heterojunction is formed. The cobalt terbium alloy nano-particles are accurately loaded and wrapped on the top of the gallium nitride nano-wire through the magnetron sputtering method, the process controllability is high, compatibility is good, and the method is suitable for large-scale production. On the aspect of a performance improvement mechanism, on the basis of the magnetic characteristics of cobalt terbium alloy, through the synergistic effect of three core mechanisms including the magnetoelectric effect, interface charge regulation and control and catalytic auxiliary surface state optimization, the problems that a traditional gallium nitride detector is high in carrier recombination rate, low in response speed, insufficient in stability and the like are solved. In the aspect of application value, the performance limitation of a traditional gallium nitride detector is broken through, and the gallium nitride detector can be widely adapted to high-end scenes such as transient ultraviolet signal detection and extreme environment monitoring.

The present invention provides an inertial energy recovery assembly and a vehicle; wherein the inertial energy recovery assembly includes a housing, an inertial body, and a battery; the housing includes two parts with opposite magnetic properties to form a magnetic field within the housing; the inertial body is a magnetic conductor and is slidably mounted within the housing, and can move along the direction of magnetic flux lines that cut the magnetic field under the action of inertia; the battery is electrically connected to the inertial body to form a closed circuit. The present invention installs the inertial energy recovery assembly on the vehicle and utilizes the vehicle's starting and braking actions, including changes in vehicle speed during operation, and even the inertial potential energy caused by ground vibration when the vehicle is static, to move the inertial body within the housing, charging the vehicle's battery through the magnetoelectric effect, thereby solving the problems of insufficient energy utilization and battery life for the vehicle.

Embodiments of the present disclosure integrate magnetoelectric nanowire arrays within antenna assemblies to form ultra-compact antennas. An exemplary method comprises using a dielectrophoretic force to orient a magnetoelectric nanowire across an electrode gap separating a pair of electrodes; and transmitting or receiving electromagnetic waves through a magnetoelectric effect of the magnetoelectric nanowire. Other methods, apparatuses, and systems are also presented.