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A method for studying the characteristics of magnetic memory signals

A signal feature and magnetic memory technology, which is applied in the field of magnetic memory signal feature research based on FLAPW algorithm, can solve the problem that there is no unified conclusion on the force-magnetic coupling mechanism of magnetic memory signal.

Active Publication Date: 2021-07-06
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The magnetic memory method can effectively judge the stress concentration area of ​​ferromagnetic metal components, but neither Newtonian mechanics nor Maxwell's equations have elaborated on the force-magnetic coupling. There is no unified conclusion on the force-magnetic coupling mechanism of the magnetic memory signal. The algorithm for the magnetic memory signal It is also the bottleneck problem in this field

Method used

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  • A method for studying the characteristics of magnetic memory signals
  • A method for studying the characteristics of magnetic memory signals
  • A method for studying the characteristics of magnetic memory signals

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Experimental program
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Embodiment Construction

[0088] The present invention comprises the following steps:

[0089] Step 1): Build a magnetic model

[0090] According to the electron spin theory and Hund's law, the process of ferromagnetic components reaching the yield limit under the action of external force is the process from when the electron shell is never filled to half to when the electron shell is filled to half, the total momentum moment quantum number in this process Expressed as:

[0091]

[0092] Among them, J is the quantum number of the total momentum moment, L is the total momentum moment of the orbit, S is the total spin moment, n is the number of electrons, and N is the total number of particles; from formula (1), it can be known that the charge density distribution can represent the total momentum moment Variety;

[0093] According to the gyromagnetic effect of ferromagnetic objects, the total magnetic moment and total momentum moment of the object have the following relationship:

[0094]

[009...

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Abstract

A method for researching the characteristics of magnetic memory signals belongs to the technical field of magnetic memory signal detection of ferromagnetic materials, and in particular relates to a method for researching the characteristics of magnetic memory signals based on the FLAPW algorithm. The invention includes the following steps: step 1): establishment of a magnetodynamic model; step 2): use of the FLAPW full potential linear plus plane wave method; and the calculation of charge density and atomic magnetic moment to verify the accuracy of the model.

Description

technical field [0001] The invention belongs to the technical field of magnetic memory signal detection of ferromagnetic materials, and in particular relates to a method for researching the characteristics of magnetic memory signals based on a FLAPW algorithm. Background technique [0002] Pipeline transportation is one of the main methods of international oil and gas transportation. It has the advantages of large transportation volume, not restricted by climate and other ground factors, continuous operation and low cost. [0003] The safety maintenance of long-distance oil and gas pipelines is the core issue of pipeline operation. Judging from the analysis of pipeline accidents in recent years, new pipeline accidents occur frequently, and at this time the macroscopic defects of the pipe body have not been fully formed. Conventional non-destructive testing techniques such as magnetic particle, magnetic flux leakage, eddy current and infiltration have played an important rol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/83G06F30/18G06F30/20G06F113/14G06F119/14
CPCG06F30/20G06F2119/06
Inventor 刘斌何璐瑶任建
Owner SHENYANG POLYTECHNIC UNIV