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Method for measuring spin polarizability of magnetic material

A magnetic material and spin-polarized technology, which can be used in the measurement of magnetic properties, material magnetic variables, etc., can solve the problems of complex synchrotron radiation experiments, high cost, hinder the progress of the exploration of new magnetic materials, etc., and achieve convenient experimental design and simplified research. effect of the process

Active Publication Date: 2021-07-16
FUDAN UNIV
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Problems solved by technology

However, synchrotron radiation experiments are more complicated, costly, and resources are scarce, and it is difficult to popularize them in ordinary laboratories, which seriously hinders the progress of the exploration of new magnetic materials.

Method used

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  • Method for measuring spin polarizability of magnetic material
  • Method for measuring spin polarizability of magnetic material
  • Method for measuring spin polarizability of magnetic material

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Experimental program
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Effect test

Embodiment 1

[0051] The first step is to use the focused ion beam on the selected material Fe 3 GeTe 2 After processing, a sample with a size of 12 μm×4 μm×0.1 μm was obtained, and the two sides of the sample formed a current path with the chip by depositing Pt.

[0052] In the second step, insert the sample into a Lorentz transmission electron microscope, control the temperature of the sample at 100K, and use the Fresnel mode to observe its magnetic domain structure.

[0053] The third step is to connect the current pulse source and the sample, and apply a current density of 5.3×10 at a frequency of 1 Hz. 10 A / m 2 , a current pulse with a pulse length of 80ns I 1 , through the in-situ observation of the moving position of the recorded stripe magnetic domain, the velocity of the magnetic domain movement can be obtained as v 1 = 0.76m / s.

[0054] The fourth step is to build a simulation system, the size of the grid is 2nm, and the Fe 3 GeTe 2 The material parameters of the material a...

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Abstract

The invention relates to a method for measuring the spin polarizability of a magnetic material. The method comprises the following steps that the actual movement speed vexp of a magnetic domain wall of the magnetic material is measured under the action of pulse current Iexp by using an in-situ Lorentz transmission electron microscope test technology; the theoretical movement speed vthe of the magnetic domain wall of the same magnetic material under the action of the complete spin polarization current Ithe is calculated through micro-magnetic simulation, and the spin polarizability P of the magnetic material is calculated through comparison between actual data and theoretical data. Compared with a traditional spin polarizability testing method utilizing synchrotron radiation and magnetic circular dichroism, the method is simpler and more convenient, and a more convenient technical method is provided for analyzing spin polarizability of a novel magnetic material in the future.

Description

technical field [0001] The invention belongs to the technical field of material parameter measurement, and relates to a method for measuring the spin polarizability of magnetic materials. Background technique [0002] In recent years, with the rapid development of spintronics, research on the electrical transport properties of magnetic materials has gradually deepened. In particular, the continuous development of magnetic storage technology has made storage devices related to spin-transfer torque effect and spin-orbit torque effect become the main direction of future development. Corresponding new magnetic materials, such as magnetic skyrmion materials, two-dimensional magnetic materials, etc., have been put into the exploration of deviceization. In many experiments, the spin polarizability of a magnetic material is a very important parameter, which determines the degree of spin polarization and the magnitude of the generated spin torque when the current flows through the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/12G01N27/72
CPCG01R33/12G01N27/72
Inventor 车仁超张瑞轩裴科王龙圆张捷
Owner FUDAN UNIV
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