Magnetic sensor and its application method for suppressing low-frequency noise by using magnetic flux electric control

Abstract

The invention discloses a magnetic sensor for suppressing low-frequency noise through magnetic power-on regulation and an application method of the magnetic sensor. A first magnetic force line aggregator and a second magnetic force line aggregator are arranged on an insulating substrate of the magnetic sensor; a magnetic resistance sensitive unit is arranged in a gap, between the first magnetic force line aggregator and the second magnetic force line aggregator, in the insulating substrate; a magnetic power-on regulation unit is arranged on the upper side of the gap and comprises an electrically adjustable magnetic film, a piezoelectric substrate bottom electrode, a piezoelectric substrate and a piezoelectric substrate top electrode which are sequentially arranged in a stacked mode from bottom to top; and the piezoelectric substrate bottom electrode and the piezoelectric substrate top electrode constitute a driving electrode of the piezoelectric substrate. The magnetic conductivity ofa micro-magnetic structure is periodically regulated through an alternating-current electric field, high-frequency modulation of a detected magnetic field in the gap is achieved, then the influence ofthe low-frequency noise of the sensor is suppressed through a high-pass filter, the low-frequency and weak-magnetism detection ability of a traditional magnetic resistance sensor is greatly improved,and the magnetic sensor has the advantages of being low in power consumption, good in stability, high in anti-jamming capability and capable of effectively suppressing the low-frequency noise.

Description

technical field [0001] The present invention relates to a weak magnetic field signal detection technology, in particular to a magnetic sensor and an application method for controlling and suppressing low-frequency noise by using magnetic flux and electricity, which are used to control the permeability of a micro-magnetic structure by using an electric field to suppress the influence of low-frequency noise on the sensor, and greatly improve the traditional magnetoresistance Sensor weak magnetic detection capability. Background technique [0002] Weak magnetic field detection is widely used in aerospace, intelligent transportation, resource exploration, biomedicine and other fields, especially in key technical fields related to national security such as magnetic target detection, geomagnetic matching navigation, and space environment monitoring. At this stage, there are many types of sensors that can be used to detect weak magnetic fields. Among them, magnetoresistive sensors ...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a low-frequency noise suppression method based on magnetic flux modulation for the existing magnetic sensor based on mechanical vibration flux modulation, which has problems such as difficult control, easy to be disturbed by the environment, and insufficient stability. The magnetic sensor and its application method, the invention utilizes the electric field to regulate the magnetic permeability of the micro-magnetic structure, suppresses the influence of the 1 / f noise of the sensor, greatly improves the weak magnetic detection ability of the traditional magnetoresistive sensor, has low power consumption, good stability, and anti-interference The advantages of strong ability and efficient suppression of 1 / f noise

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