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A method for measuring the spin polarizability of magnetic materials

A technology of magnetic materials and spin polarization, which is applied to the measurement of magnetic variables and magnetic properties of materials, can solve the problems of high cost, complicated synchrotron radiation experiments, and difficulty in popularizing laboratories, etc., to simplify the research process and facilitate experimental design Effect

Active Publication Date: 2022-06-07
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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  • A method for measuring the spin polarizability of magnetic materials
  • A method for measuring the spin polarizability of magnetic materials
  • A method for measuring the spin polarizability of magnetic materials

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Experimental program
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Embodiment 1

[0051] The first step is to use a focused ion beam to pair 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 current paths were formed on both sides of the sample and the chip by depositing Pt.

[0052] In the second step, the sample was inserted into a Lorentz transmission electron microscope, the temperature of the sample was controlled at 100K, and its magnetic domain structure was observed by Fresnel mode.

[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 I with a pulse length of 80ns 1 , by in-situ observation of the position of the magnetic domain movement of the recording stripe, 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 parame...

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Abstract

The invention relates to a method for measuring the spin polarizability of a magnetic material. First, the in-situ Lorentz transmission electron microscope test technique is used to measure the magnetic material at the pulse current I exp The actual moving speed v of the magnetic domain wall under the action exp , and then use the micromagnetic simulation to calculate the magnetic domain wall of the same magnetic material under the action of a completely spin-polarized current I the Theoretical speed of motion under v the , and then calculate the spin polarizability P of the magnetic material by comparing the actual data with the theoretical data. Compared with the traditional spin polarizability test method using synchrotron radiation and magnetic circular dichroism, the invention is simpler and more convenient, and provides a more convenient technical method for the spin polarizability analysis of new magnetic materials 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, the research on the electrical transport properties of magnetic materials has gradually deepened. In particular, with the continuous development of magnetic storage technology, memory devices related to the spin transfer torque effect and the spin-orbit torque effect have 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 of the current flowing through the material and the magnitude of the s...

Claims

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Application Information

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Patent Type & Authority Patents(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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