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A passive low-power microwave detection method and its device and preparation method

A microwave detection and passive detection technology, which is applied in the manufacturing/processing of measuring devices, electromagnetic devices, and material analysis using microwave means, can solve the problem of high system power consumption and achieve the effect of low power consumption

Active Publication Date: 2021-11-05
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the ferromagnetic metal system is mainly used here, so the power consumption of the system is very high

Method used

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  • A passive low-power microwave detection method and its device and preparation method
  • A passive low-power microwave detection method and its device and preparation method
  • A passive low-power microwave detection method and its device and preparation method

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Embodiment 1

[0044] A method for preparing a passive low-power microwave detection device, comprising the following steps:

[0045] S1. Single crystal silicon is selected as the substrate, and acetone, ethanol, and deionized water are used for ultrasonic cleaning in sequence.

[0046] S2. Prepare an antiferromagnetic topological insulator single crystal by high-temperature melting method, put Mn, Bi, Te powder into a quartz tube at a molar ratio of 1:2:4, and then put the quartz tube vertically into a muffle furnace, Rise to 950°C for 12 hours, keep the temperature for 12 hours, then drop to 585°C for 3000 minutes, keep the temperature for 24 hours, then drop to room temperature to obtain MnBi 2 Te 4 blocks;

[0047] S3, the MnBi obtained in the step S2 2 Te 4 Blocks were obtained by mechanical exfoliation to obtain nanosheets, and MnBi was dissociated using adhesive tape 2 Te 4 block material, obtain a thin layer antiferromagnetic topological insulator, and transfer it to a single c...

Embodiment 2

[0050] A method for preparing a passive low-power microwave detection device, comprising the following steps:

[0051] S1. Single crystal silicon is selected as the substrate, and acetone, ethanol, and deionized water are used for ultrasonic cleaning in sequence.

[0052] S2. Prepare an antiferromagnetic topological insulator single crystal by high-temperature melting method, put Mn, Bi, Te powder into a quartz tube at a molar ratio of 1:2:4, and then put the quartz tube vertically into a muffle furnace, Rise to 950°C for 12 hours, keep the temperature for 12 hours, then drop to 585°C for 3000 minutes, keep the temperature for 24 hours, then drop to room temperature to obtain MnBi 2 Te 4 blocks;

[0053] S3, the MnBi obtained in the step S2 2 Te 4 Blocks were obtained by mechanical exfoliation to obtain nanosheets, and MnBi was dissociated using adhesive tape 2 Te 4 Block material, obtain thin layer antiferromagnetic topological insulator, and transfer it to the single c...

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Abstract

The invention discloses a passive and low-power microwave detection method and its device and preparation method. An antiferromagnetic topological insulator layer is prepared. Under microwave energy, the spins in the antiferromagnetic topological insulator layer precess to generate spins. Due to the characteristic of spin-momentum locking of topological surface states, spin current will spontaneously generate directional charge flow on the surface. The charge flow is detected by electrodes, enabling passive low-power detection of microwaves. Since the multilayer antiferromagnetic topological insulator layer can be regarded as a periodic stacking of the double-layer structure of the antiferromagnetic layer and the topological insulator layer, the microwave detection sensitivity is doubled. The topological surface states exhibit strong robustness and low-dissipation current transport properties, reducing the power consumption of microwave detection. The invention not only makes full use of the strong robustness and unique electrical transmission characteristics of the topological surface state, but also utilizes the microwave resonance of the antiferromagnetic layer, so that the structure can realize passive microwave detection with lower power consumption.

Description

technical field [0001] The invention belongs to the technical field of spintronic devices, and in particular relates to a passive low-power microwave detection method, a device and a preparation method thereof. Background technique [0002] Spintronics not only makes use of knowledge about electron charge, but also some theory about electron spin. The advantages of spintronics include low power consumption, less energy requirements, competitive data transmission capabilities, and large storage capacities. It has been used in various information processing equipment, memory and memory devices—especially in ultra-high-density hard disk drives and non-volatile memory. [0003] As early as 1940, people realized the existence of spin resonance. On an external magnetic field, the magnetic moment will precess, just like a top. This kind of spin resonance is understood from a quantum perspective, that is, under the action of a magnetic field, the spin undergoes Zeeman splitting. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N22/00H01L43/08H01L43/10H01L43/12H10N50/01H10N50/10
CPCG01N22/00H10N50/85H10N50/10H10N50/01
Inventor 张敏昊宋凤麒曹路张同庆
Owner NANJING UNIV