CN111398875A - Weak magnetic field detector based on magnetic particles and diamond nitrogen-vacancy color centers - Google Patents
Weak magnetic field detector based on magnetic particles and diamond nitrogen-vacancy color centers Download PDFInfo
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- CN111398875A CN111398875A CN202010345826.7A CN202010345826A CN111398875A CN 111398875 A CN111398875 A CN 111398875A CN 202010345826 A CN202010345826 A CN 202010345826A CN 111398875 A CN111398875 A CN 111398875A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
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- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The invention provides a weak magnetic field detector based on magnetic particles and diamond nitrogen-vacancy color centers. Applying a magnetic particle localization magnetic field such that the magnetic field in the vicinity of the magnetic particles is enhanced; and measuring the magnetic field near the magnetic particles, namely at the diamond position by using the fluorescence emission characteristic of the diamond nitrogen-vacancy color center, and finally determining the weak magnetic field to be measured according to the magnetic field intensity at the diamond particles. Because the magnetic particles have good localization effect on the incident magnetic field, the magnetic field near the magnetic particles can be greatly enhanced; in addition, the diamond nitrogen-vacancy color center magnetic measurement technology also has high sensitivity, so the invention can realize weak magnetic field detection and has the advantage of high magnetic field measurement resolution.
Description
Technical Field
The invention relates to the field of weak magnetic field detection, in particular to a weak magnetic field detector based on magnetic particles and diamond nitrogen-vacancy color centers.
Background
Weak magnetic field detection is very important in the fields of medical and environmental measurements. The traditional magnetic field detector based on elastic materials and magnetostrictive materials has low sensitivity and cannot realize weak magnetic field detection.
Disclosure of Invention
In order to solve the problems, the invention provides a weak magnetic field detector based on magnetic particles and diamond nitrogen-vacancy color centers. The magnetic particles and the diamond particles are located on a substrate. The magnetic particles and the diamond particles are in contact. The diamond particles all contain nitrogen-vacancy colour centres. And when a weak magnetic field is detected, laser with a preset wavelength is applied to excite the diamond particles. Meanwhile, a sweep frequency signal in a preset frequency range is emitted to the diamond particles, fluorescence emitted by the stimulated diamond particles is collected, the magnetic field intensity of the diamond particles is determined by analyzing the change rule of the fluorescence intensity along with the frequency of the sweep frequency signal, and the intensity of the weak magnetic field to be detected is finally judged through the magnetic field intensity of the diamond particles.
Further, the magnetic particles are ferroferric oxide nanoparticles.
Still further, the diamond particles have a particle size of less than 400 nanometers.
Furthermore, the particle size of the ferroferric oxide nano particles is 10-100 nanometers.
Further, magnetic particles are spaced apart from the diamond particles.
Further, diamond particles are located on an upper layer of the magnetic particles.
Further, the magnetic particles are in a monolayer; the diamond particles are in a monolayer.
The invention has the beneficial effects that: the invention provides a weak magnetic field detector based on magnetic particles and diamond nitrogen-vacancy color centers, which applies a magnetic particle localization magnetic field to enhance the magnetic field near the magnetic particles; and measuring the magnetic field near the magnetic particles, namely at the diamond position by using the fluorescence emission characteristic of the diamond nitrogen-vacancy color center, and finally determining the weak magnetic field to be measured according to the magnetic field intensity at the diamond particles. Because the magnetic particles have good localization effect on the incident magnetic field, the magnetic field near the magnetic particles can be greatly enhanced; in addition, the diamond nitrogen-vacancy color center magnetic measurement technology also has high sensitivity, so the invention can realize weak magnetic field detection and has the advantage of high magnetic field measurement resolution.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a weak magnetic field detector based on magnetic particles and diamond nitrogen-vacancy colour centres.
Fig. 2 is a schematic diagram of yet another weak magnetic field detector based on magnetic particles and diamond nitrogen-vacancy colour centers.
In the figure: 1. a substrate; 2. magnetic particles; 3. diamond particles.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description of the embodiments, structural features and effects of the present invention will be made with reference to the accompanying drawings and examples.
Example 1
The invention provides a weak magnetic field detector based on magnetic particles and diamond nitrogen-vacancy color centers, which comprises a substrate 1, magnetic particles 2 and diamond particles 3 as shown in figure 1. Magnetic particles 2 and diamond particles 3 are located on a substrate 1. The substrate 1 may be a non-magnetic material, such as a silicon dioxide material. The diamond particles 3 each contain a nitrogen-vacancy colour centre. The magnetic particles 2 and the diamond particles 3 are in contact so as to excite a strong magnetic field at the diamond particles 3. The magnetic particles 2 are ferroferric oxide nano particles. The particle size of the ferroferric oxide nano particles is 10-100 nanometers, so that the magnetic field can be better localized. The diamond particles 3 have a particle size of less than 400 nm, more preferably less than 200 nm, so as to be closer to the surface of the magnetic particles 2. When a weak magnetic field is detected, laser with a predetermined wavelength is applied to excite the diamond particles 3, and the wavelength of the excitation light is 532 nanometers. Meanwhile, a sweep frequency signal in a preset frequency range is transmitted to the diamond particles 3, and the sweep frequency range of the microwave is 2.8GHz-2.94 GHz; collecting the fluorescence emitted by the stimulated diamond particles 3, determining the magnetic field intensity of the diamond particles 3 by analyzing the change rule of the fluorescence intensity along with the frequency of the sweep frequency signal, and finally determining the intensity of the weak magnetic field to be detected by the magnetic field intensity of the diamond particles 3. Because the magnetic particles 2 have good localization effect on the incident magnetic field, the magnetic field near the magnetic particles 2 can be greatly enhanced; in addition, the diamond nitrogen-vacancy color center magnetic measurement technology also has high sensitivity, so the invention can realize weak magnetic field detection and has the advantage of high magnetic field measurement resolution.
In the present invention, under the action of the incident magnetic field, the magnetic particles 2, such as ferroferric oxide nanoparticles, under the action of the magnetic field, the magnetic particles 2 also generate heat, and the heat is also transferred to the diamond particles 3, because the fluorescence effect of the diamond nitrogen-vacancy color center also depends heavily on the temperature of the diamond, and the detection sensitivity is further improved by the two actions.
Furthermore, as shown in fig. 1, the magnetic particles 2 and the diamond particles 3 are arranged at intervals, so that due to the gap effect, the diamond particles 3 are in the gathering region of the magnetic field, the magnetic field measured by the diamond nitrogen-vacancy color center is stronger, the test difficulty is reduced, and the measurement sensitivity is improved.
Example 2
On the basis of example 1, as shown in fig. 2, diamond particles 3 are located on the upper layer of magnetic particles 2. The magnetic particles 2 are a monolayer and the diamond particles 3 are a monolayer. The positional relationship of the magnetic particles 2 and the diamond particles 3 in the embodiment of fig. 1 ensures a strong magnetic field at the diamond particles 3, but is difficult to prepare. In this embodiment, a monolayer of magnetic particles 2 is first laid on a substrate 1, and then a monolayer of diamond particles 3 is provided on the magnetic particles 2. In this way, a uniform magnetic field is substantially ensured at the diamond particles 3. The uniform magnetic field shows a narrow valley in the frequency relation of the fluorescence with the sweep frequency, so that the measurement accuracy is improved, and the measurement sensitivity is also improved.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (7)
1. A weak magnetic field detector based on magnetic particles and diamond nitrogen-vacancy color centers, comprising: a substrate, magnetic particles, diamond particles;
the magnetic particles and the diamond particles are located on the substrate, and the magnetic particles and the diamond particles are in contact; the diamond particles all contain nitrogen-vacancy color centers;
when a weak magnetic field is detected, laser with a preset wavelength is applied to excite the diamond particles; meanwhile, emitting a sweep frequency signal in a preset frequency range to the diamond particles, collecting fluorescence emitted by the stimulated diamond particles, determining the magnetic field strength of the diamond particles by analyzing the change rule of the intensity of the fluorescence along with the frequency of the sweep frequency signal, and finally determining the intensity of the weak magnetic field to be detected by the magnetic field strength of the diamond particles.
2. The weak magnetic field sensor based on magnetic particles and diamond nitrogen-vacancy color centers of claim 1 wherein: the magnetic particles are ferroferric oxide nanoparticles.
3. The weak magnetic field sensor based on magnetic particles and diamond nitrogen-vacancy color centers of claim 2 wherein: the diamond particles have a particle size of less than 400 nanometers.
4. A weak magnetic field sensor based on magnetic particles and diamond nitrogen-vacancy colour centres according to claim 3, wherein: the particle size of the ferroferric oxide nano particles is 10-100 nanometers.
5. The weak magnetic field sensor based on magnetic particles and diamond nitrogen-vacancy colour centres of any one of claims 1 to 4, wherein: the magnetic particles are spaced apart from the diamond particles.
6. The weak magnetic field sensor based on magnetic particles and diamond nitrogen-vacancy colour centres of any one of claims 1 to 4, wherein: the diamond particles are located on an upper layer of the magnetic particles.
7. The weak magnetic field sensor based on magnetic particles and diamond nitrogen-vacancy color centers of claim 6 wherein: the magnetic particles are in a single layer, and the diamond particles are in a single layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010345826.7A CN111398875A (en) | 2020-04-27 | 2020-04-27 | Weak magnetic field detector based on magnetic particles and diamond nitrogen-vacancy color centers |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010345826.7A CN111398875A (en) | 2020-04-27 | 2020-04-27 | Weak magnetic field detector based on magnetic particles and diamond nitrogen-vacancy color centers |
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| CN111398875A true CN111398875A (en) | 2020-07-10 |
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| CN202010345826.7A Withdrawn CN111398875A (en) | 2020-04-27 | 2020-04-27 | Weak magnetic field detector based on magnetic particles and diamond nitrogen-vacancy color centers |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113777540A (en) * | 2021-09-18 | 2021-12-10 | 哈尔滨工业大学 | Diamond NV color center magnetometer containing magnetic flux collector |
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2020
- 2020-04-27 CN CN202010345826.7A patent/CN111398875A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113777540A (en) * | 2021-09-18 | 2021-12-10 | 哈尔滨工业大学 | Diamond NV color center magnetometer containing magnetic flux collector |
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Application publication date: 20200710 |