A strong permanent magnet device for magnetizing materials under vacuum system
A technology of vacuum system and permanent magnet, which is applied in measuring devices, analyzing materials, and using wave/particle radiation for material analysis, etc. It can solve problems such as increasing equipment costs and experiment costs, difficulty in meeting extreme tests, and difficulty in achieving magnetic field strength. , to achieve the effect of improving repeatability, low cost of use, and small size
Active Publication Date: 2021-10-22
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology
However, the magnetic field strength of a simple permanent magnet is difficult to reach one Tesla (1T), and the magnetic field strength is limited to the surface of the magnet, which is difficult to meet the requirements of extreme tests
Using an electromagnet to achieve a strong magnetic field above one Tesla requires a very large copper coil, or even a superconducting coil, which requires the design of a larger vacuum chamber, which hinders the miniaturization of the equipment; and the electromagnet needs to be equipped with a large Power supply and magnet cooling device, further increasing equipment cost and experiment cost
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[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0029] 1. Permanent magnet array design
[0030] Such as figure 2 As shown, the present invention adopts the annular Halbach array to design the structure of the permanent magnet. 8 or 12 magnets with different magnetization directions are arranged in a ring, and their magnetic pole directions are already in the figure 2 given (arrow pointing to the South Pole). There are two options for the magnet material. N52 NdFeB magnets can obtain the strongest permanent magnetic field, but the working temperature cannot exceed 80 degrees Celsius; samarium cobalt magnets can also obtain a magnetic field strength exceeding 1T, and the working temperature can reach 180 degrees Celsius. Choose according to whether the equipment needs high temperature baking. The magnetic field intensity at the center of the 8th-order and 12th-order Halbach array rings ...
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Abstract
The invention discloses a strong permanent magnet device for magnetizing materials under a vacuum system, comprising: a permanent magnet structure, a vacuum chamber, and a sample holder, wherein the sample holder and the permanent magnet are installed inside the vacuum chamber, and are respectively responsible for cooling and heating the sample magnetic field. This device does not need to use large current (>100A) and heat insulation device to maintain the magnetic field, so there will be no additional current to cause additional interference to the measurement system, low cost of use, and stable performance. The magnetic field generated by the device exceeds 1T, which is much higher than the magnetic field strength of traditional magnets, and the magnetic field is evenly distributed in the magnetized area, which improves the repeatability of the experiment. Compared with the linear Halbach array magnets that have been widely used, the ring magnets are smaller in size, and the distribution of the strongest magnetic field points is reasonable, which is suitable for use in ultra-high vacuum environments.
Description
technical field [0001] The invention relates to the fields of vacuum technology, angle-resolved photoelectron energy spectrum characterization, and permanent magnet applications, in particular to a strong permanent magnet device for magnetizing materials under a vacuum system. Background technique [0002] Magnetic materials have always been a research hotspot due to their complex physical properties and broad application prospects. At present, the technical means of measuring the magnetic properties of materials in a normal pressure environment are relatively mature, and there are also commercial products for measuring instruments (physical property measurement system PPMS) (see references Lashley J C, Hundley M F, Migliori A, et al. Critical examination of heat capacity measurements made on a Quantum Design physical property measurement system [J]. Cryogenics, 2003, 43(6): 369-378.). However, it is very difficult to control and measure the magnetic properties of materials...
Claims
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IPC IPC(8): G01N23/2273G01N23/2204
CPCG01N23/2204G01N23/2273
Inventor 孙喆王鹏栋刘毅李昱良张国斌
Owner UNIV OF SCI & TECH OF CHINA