Magnetic cooling for microkelvin nanoelectronics on a cryofree platform

Palma, Mario and Maradan, Dario and Casparis, Lucas and Liu, Tai-Min and Froning, Florian N. M. and Zumb`uhl, Dominik. M.. (2017) Magnetic cooling for microkelvin nanoelectronics on a cryofree platform. Review of Scientific Instruments, 88. 043902.

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Official URL: https://edoc.unibas.ch/60895/

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We present a parallel network of 16 demagnetization refrigerators mounted on a cryofree dilution refrigerator aimed to cool nanoelectronic devices to sub-millikelvin temperatures. To measure the refrigerator temperature, the thermal motion of electrons in a Ag wire—thermalized by a spot-weld to one of the Cu nuclear refrigerators—is inductively picked-up by a superconducting gradiometer and amplified by a SQUID mounted at 4 K. The noise thermometer as well as other thermometers are used to characterize the performance of the system, finding magnetic field independent heat-leaks of a few nW/mol, cold times of several days below 1 mK, and a lowest temperature of 150 μK of one of the nuclear stages in a final field of 80 mT, close to the intrinsic SQUID noise of about 100 μK. A simple thermal model of the system capturing the nuclear refrigerator, heat leaks, and thermal and Korringa links describes the main features very well, including rather high refrigerator efficiencies typically above 80%.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Quantenphysik (Zumbühl)
UniBasel Contributors:Zumbühl, Dominik M
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:AIP Publishing
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:28 Feb 2018 14:02
Deposited On:28 Feb 2018 14:01

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