Vertical variable magnetic field device

Abstract

The invention relates to a vertical variable magnetic field device which is applied to a low-temperature probe station system. The device comprises a top permanent magnet, a bottom permanent magnet, a sample holder and a plurality of support screws; one end of each support screw is fixed on the sample holder; the top permanent magnet is arranged on each support screw; and the bottom permanent magnet is arranged on the sample holder. The device of the invention changes the surface magnetic line density through precisely adjusting the altitude of the top permanent magnet under the condition that the interior of a TTP4 low-temperature probe station system housing in the company of Lakeshore<R> maintains the original high vacuum, thereby achieving the effect of changing a magnetic field. The invention has the advantages of simple and feasible scheme, low cost, stability, reliability, large change range of the magnetic field, and best compatibility with the system. Furthermore, the invention is favorable for wide popularization and application.

Description

technical field [0001] The invention relates to a magnetic field device, in particular to a vertical variable magnetic field device with variable magnetic field strength applied to a cryogenic probe station system. Background technique [0002] existing based on The vertical variable magnetic field device of the company's TTP4 cryogenic probe station system has played an irreplaceable and practical role in this system. The vertical variable magnetic field device constitutes the magnetic field scheme of the low-temperature Hall effect test system, and becomes an important part of the low-temperature Hall effect test system based on this system. The magnetic field in optional accessories offered by the company for this cryogenic probe station system is achieved by applying it outside the chamber, either through an electromagnet (Model EM4 and Model EM7) or a low-temperature superconducting magnet. [0003] For the electromagnet, the above two electromagnets can achieve the...

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Problems solved by technology

[0003] For the electromagnet, the above two electromagnets can achieve the purpose of applying a variable magnetic field, but the electromagnet is placed outside the cavity and coupled to the sample through the outer wall of the cavity, which will inevitably change the magnetic field distribution and cause errors in the measurement. ;In addition, the direction of the applied magnetic field is parallel to the surface of the sample to be tested, so the Hall effect test cannot be completed, and a special sample stage needs to be customized for measurement

And this electromagnet device equipment is huge, takes up space

[0004] For the low-temperature superconducting magnet scheme, although the superconducting winding can be used to apply a variable magnetic field, it must provide an additional low-temperature environment, and the test cannot be completed at room temperature; and with the selection of specific winding materials, this scheme can achieve extremely accurate variable magnetic field. Magnetic field effect, but the equipment is expensive and costly

[0005] So far, there is no available The magnet device with variable magnetic field of the company's TTP4 cryogenic probe station system

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