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Method and apparatus for high-voltage Hall effect

A technology of Hall effect and measuring device, which is applied in the direction of measuring device, measuring magnetic variable, magnetic performance measurement, etc., can solve the problems such as the inability to realize Hall effect measurement of anvil

Inactive Publication Date: 2007-11-21
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the fact that the surface of the diamond anvil is too small, the gasket used between the press that generates high pressure and the two diamond anvils is made of steel, and the distance between the two magnetic heads of the electromagnet that generates the magnetic field is too large, etc., it cannot be realized. In-Situ Hall Effect Measurements at High Pressure on a Diamond-Anvil Anvil

Method used

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  • Method and apparatus for high-voltage Hall effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 illustrates the structure of the device of the present invention in conjunction with the accompanying drawings

[0029]1 to 3 show the structure of the device of the present invention. Among them, 1 is a spacer, placed between two diamond anvils, which can be made of metal rhenium with a purity of more than 99.9%; 2 is a sample cavity, which is surrounded by two diamond anvils and spacer 1 to place samples 3 is an electrode, which is deposited on a diamond anvil surface and four mutually insulated electrodes on the side, which can be made of platinum material; 4 is a protective layer, which is deposited on the diamond anvil surface and the side surface of the covering electrode 3 Aluminum oxide layer, however, has the terminal end of electrode 3 to expose respectively on diamond anvil anvil surface and side; The exposed ends of the electrodes 3 are electrically connected to the four connection points M, N, P and Q of the Hall automatic test system 8 respec...

Embodiment 2

[0030] Embodiment 2 illustrates the uniformity of the magnetic field,

[0031] Because the diameter of the shaking table 9 is 22mm, the middle is a small hole with a diameter of 1mm, the whole shaking table 9 is not an entity, therefore, the magnetic field generated between the two shaking tables 9 is not completely uniform, as shown in Fig. 4 Magnetic field distribution between out shaker 9. Because the present invention uses non-magnetic press 6 and spacer 1, uses the shaker 9 that contains ferromagnetic material, produces an almost uniform magnetic field region in the center of the shaker 9 with a diameter of 10mm. Fig. 5 provides the error comparison between the magnetic field strength at the position of the sample (sample cavity 3) and the magnetic field strength detected at the position of the gauss meter probe 7, and the calculation formula is: the measured value of the gauss meter probe-the magnetic field strength value at the position of the sample [that is The value...

Embodiment 3

[0033] Embodiment 3 test process and measurement result

[0034] The measuring method of the present invention adopts the van der Pauw method to measure, taking the HgTe sample as an example, the specific experimental steps are as follows:

[0035] Assemble the device into the form shown in Figure 1.

[0036] The test process is to place the gauss meter probe 7 on the gasket 1, and the top of the gauss meter probe 7 touches the side of the diamond anvil; apply current to the electromagnet 5, rotate the gauss meter probe 7 to detect the magnetic field strength, and when the gauss meter shows the maximum Fix the Gauss meter probe 7 at the same time; then connect the 4 electrodes 3 on the diamond anvil to the 4 connection points on the Hall automatic test system 8 according to the right-hand rule; turn on the Hall automatic test system 8 for data measurement .

[0037] During the test, if the direction of the magnetic field does not pass through the sample vertically, the gauss...

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Abstract

A measurement device of Hall effect is prepared as setting washer of Re material between two diamond press anvils, setting steel table between pressing machine of Ti alloy material and diamond head to head anvil, setting electromagnetic iron on said device, depositing four electrodes being insulated to each other and aluminium oxide protection layer on anvil surface and side surface of one diamond press anvil, exposing electrodes at end of anvil surface in sample cavity of diamond head to head anvil, exposing electrodes at end of side surface and connecting electrode lead wire on electrodes.

Description

technical field [0001] The invention belongs to the technical field of measurement methods under high pressure, and in particular relates to a method for in-situ measurement of the Hall effect under high pressure conditions and a supporting device. Background technique [0002] The Diamond Counter Anvil (DAC) is an ultra-high pressure device commonly used in the study of high pressure at present, and is suitable for in-situ measurement of physical quantities under high temperature and high pressure with a variety of test methods. The application and development of DAC technology enables people to study the structure and physical properties of substances under higher temperature and pressure conditions. Now, people have realized the in-situ measurement of various physical quantities by using DAC. [0003] In-situ Hall effect measurement under high pressure on DAC is an important experimental method for high-pressure physics research. It can obtain physical quantities such as...

Claims

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Application Information

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IPC IPC(8): G01R33/12G01R33/07
Inventor 高春晓胡廷静崔晓岩张洪林刘才龙彭刚李冬妹刘洪武邹广田
Owner JILIN UNIV
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