Passive low-power-consumption microwave detection method and device, and preparation method
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A technology of microwave detection and passive detection, which is applied in the manufacture/processing of measurement devices, electromagnetic devices, and material analysis using microwave means, which can solve the problem of high power consumption of the system and achieve the effect of low power consumption
Active Publication Date: 2020-01-24
NANJING UNIV
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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 low-power-consumption microwave detection method and a passive low-power-consumption microwave detection device, and a preparation method. The passive low-power-consumption microwave detection method is characterized in that: an antiferromagnetic topological insulator layer is prepared, under microwave energy, spin precession occurs in the antiferromagnetic topological insulator layer to generate a spin current, due to a spin momentum locking feature of a topological surface state, a directional charge flow can be generated spontaneously on the surface if thespin current; and passive low-power-consumption detection of microwave can be achieved through detection of the charge flow by an electrode. The passive low-power-consumption microwave detection method of the invention has the beneficial effects that: multiple antiferromagnetic topological insulator layers can be regarded as being formed by periodic stacking of a double-layer structure consistingof an antiferromagnetic layer and a topological insulator layer, thus microwave detection sensitivity is increased in multiples; the topological surface state shows strong robustness and low-dissipation current transmission characteristic, thereby reducing power consumption of microwave detection; the passive low-power-consumption microwave detection method not only takes full advantage of the strong robustness and an unique electric transmission characteristic showed by the topological surface state, but also takes advantage of microwave resonance of the antiferromagnetic layer, thereby enabling the structure to achieve passive low-power-consumption microwave detection.
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. ...
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