5 results about "Magnetoelectric effect" patented technology

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.

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 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 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.