A nanocrystalline high-frequency magnetic characteristic detection device and measurement method under consideration of stress

Abstract

The invention discloses a detection system for high-frequency rotational magnetic properties of nanocrystals under stress, which includes a detection device for high-frequency rotational magnetic properties of nanocrystals under stress, a power amplifier, a differential amplifier circuit and a digital signal processing unit; The crystal high-frequency rotating magnetic characteristic detection device includes a magnetic circuit composed of two U-shaped magnetic cores interlaced at 90°. The magnetic core is cut from nanocrystalline strips and four square excitation windings are fixed on the magnetic At the top of the core, the lower magnetic core is fixed on the bracket by buckles. The sample to be tested is placed in the middle of the two magnetic cores, placed symmetrically, and hydraulic clamps are applied on both sides of the sample to apply stress to the sample. The height of the upper magnetic core can be adjusted by the buckle. Fixed on the bracket, the height of the magnetic core can be adjusted to adapt to samples of different sizes. Compared with the prior art, the system has a single structure, a clear and reasonable magnetic circuit, and simple manufacturing and processing of the magnetic core.

Description

technical field [0001] The invention relates to a novel magnetic characteristic detection device, in particular to a nanocrystal high-frequency magnetic characteristic detection device and a measurement method under consideration of stress. Background technique [0002] The two-dimensional rotating magnetic characteristic detection technology is to excite the sample through the yoke, so that the sample to be tested is in the rotating magnetic field, and then through the B-H composite coil attached to the sample surface, the B signal and the H signal on the sample surface are collected, and the digital The signal processing process generates the B-H curve of the sample, thereby obtaining the magnetic properties of the sample. [0003] In the prior art magnetic property detection device, the material constituting the magnetic yoke is a silicon steel sheet, which is relatively low in saturation magnetic permeability and low in saturation magnetic force. The excitation winding ...

AI Technical Summary

Problems solved by technology

The excitation winding is made of ordinary single-twisted copper wire, and the winding impedance is relatively large. When the current is excited, the core loss and winding loss are relatively high, and the magnetic characteristic detection of the sample under the high-frequency rotating magnetic field cannot be realized, which limits the magnetic properties. The scope of use of materials

[0004] The magnetic property detection device in the prior art does not have a stress applying device, and cannot detect the magnetic property of the sample under the condition of applied stress

The distance between the yokes cannot be adjusted arbitrarily, and the steps to replace the sample are cumbersome, which also limits the shape and size of the sample to be tested

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