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Thermally stable Peltier controlled vacuum chamber for electrical transport measurements
Abstract
The design, manufacture, and characterization of an inexpensive, temperature-controlled vacuum chamber with millikelvin stability for electrical transport measurements at and near room temperature is reported. A commercially available Peltier device and a high-precision temperature controller are used to actively heat and cool the sample space. The system was designed to minimize thermal fluctuations in spintronic and semiconductor transport measurements, but the general principle is relevant to a wide range of electrical measurement applications. The main issues overcome are the mounting of a sample with a path of high thermal conductivity through to the Peltier device and the heat sinking of the said Peltier device inside a vacuum. A copper slug is used as the mount for a sample, and a large copper block is used as a thermal feedthrough before a passive heat sink is used to cool this block. The Peltier device provides 20 W of heating and cooling power, achieving a maximum range of 30 K below and 40 K above the ambient temperature. The temperature stability is within 5 mK at all set points with an even better performance above the ambient temperature. A vacuum pressure of 10−8 hPa is achievable. As a demonstration, we present experimental results from current-induced electrical switching of a CuMnAs thin film. Transport measurements with and without the Peltier control emphasize the importance of a constant temperature in these applications. The thermal lag between the sample space measurement and the sample itself is observed through magnetoresistance values measured during a temperature sweep.
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Cited by 3
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Metadata
- Authors
- Poole, S. F., Amin, O. J., Solomon, A., Barton, L. X., Campion, R. P., Edmonds, K. W., & Wadley, P.
- Venue
- Review of Scientific Instruments
- Publisher
- AIP Publishing
- Published
- 2024-03-01
- Volume
- 95
- Issue
- 3
- ISSN
- 0034-6748
- 1089-7623
- Cited by
- 3
- Language
- en
- Licence
- creativecommons.org/licenses/by/4.0/ (vor, 5 d)
- creativecommons.org/licenses/by/4.0/ (tdm, 5 d)
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- Poole, S. F., Amin, O. J., Solomon, A., Barton, L. X., Campion, R. P., Edmonds, K. W., & Wadley, P. (2024). Thermally stable Peltier controlled vacuum chamber for electrical transport measurements. Review of Scientific Instruments. https://doi.org/10.1063/5.0186155
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