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Method of measuring magnetic polarizability of film based on low-frequency impedance analyzer

A low-frequency impedance and analyzer technology, applied in the direction of material impedance, preparation of test samples, etc.

Inactive Publication Date: 2017-06-13
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for measuring thin-film magnetic polarizability based on a low-frequency impedance analyzer for the defects existing in complex magnetic polarizability

Method used

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  • Method of measuring magnetic polarizability of film based on low-frequency impedance analyzer
  • Method of measuring magnetic polarizability of film based on low-frequency impedance analyzer
  • Method of measuring magnetic polarizability of film based on low-frequency impedance analyzer

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Experimental program
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Effect test

Embodiment

[0020] (1) Synthesis of naked γ-Fe 2 o 3 Nanoparticles and α-Fe 2 o 3 nanoparticles.

[0021] (2) The above nanoparticles were assembled on a glass slide with a diameter of 1 cm by a layer-by-layer self-assembly method based on the principle of electrostatic adsorption. The thickness of the assembled film is about 300nm.

[0022] (3) the α-Fe described in step (2) 2 o 3 The impedance of thin films composed of nanoparticles is measured with a low-frequency impedance analyzer, such as figure 1 As shown, the electric susceptibility was calculated using classical electromagnetic theory.

[0023] (4) the γ-Fe described in step (2) 2 o 3 The impedance of thin films composed of nanoparticles is measured with a low-frequency impedance analyzer, such as figure 1 As shown, using the electric susceptibility obtained in step (3), the magnetic susceptibility is calculated by classical electromagnetic theory.

[0024] (5) Analysis of measurement principle

[0025] According to t...

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Abstract

The invention discloses a method of measuring magnetic polarizability of a film based on a low-frequency impedance analyzer. The method comprises the following steps of: measuring impedance of a non-magnetic film under frequency conversion through the low-frequency impedance analyzer to derive electric polarizability; and then measuring the impedance of a magnetic film under frequency conversion through the low-frequency impedance analyzer to derive corresponding plural magnetic polarizability by means of the electric polarizability. Based on the low-frequency impedance analyzer and a classical electromagnetic magnetic polarizability formula, the method determines measuring constant items by measuring the non-magnetic alpha-Fe2O3 film and solves the plural magnetic polarizability according to derivation formulae. The method disclosed by the invention can be applied to other magnetic film materials at the same time, is simple and feasible, and has a certain engineering application prospect.

Description

technical field [0001] The invention relates to a method for measuring the magnetic polarizability of a magnetic particle film based on a low-frequency impedance analyzer, and also relates to a method for measuring the electric susceptibility of a nonmagnetic thin film. Background technique [0002] With the popularization and development of electronic materials, magnetic materials are widely used in information storage, magnetic sensors, industrial automation control, and various security systems. The further miniaturization of electronic equipment requires that the measurement frequency of magnetic materials is also increasing. Traditional methods for measuring magnetic susceptibility at high frequencies include resonance perturbation method, single coil method, strip line method, etc. These methods are suitable for dielectric loss and hysteresis loss materials. These measurement methods are in the development stage. [0003] Thin-film magnetic materials are easily defor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/02G01N1/28
CPCG01N1/28G01N27/02
Inventor 孙剑飞范凤国张韬敏王鹏马思雨顾宁
Owner SOUTHEAST UNIV