On-chip magnetic cooling of a nanoelectronic device

D. I. Bradley, A.M. Guénault, D. Gunnarsson, R.P. Haley, S. Holt, A.T. Jones, Yu.A. Pashkin, J. Penttilä, J.R. Prance, M. Prunnila, L. Roschier

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

We demonstrate significant cooling of electrons in a nanostructure below 10 mK by demagnetisation of thin-film copper on a silicon chip. Our approach overcomes the typical bottleneck of weak electron-phonon scattering by coupling the electrons directly to a bath of refrigerated nuclei, rather than cooling via phonons in the host lattice. Consequently, weak electron-phonon scattering becomes an advant-age. It allows the electrons to be cooled for an experimentally useful period of time to temperatures colder than the dilution refrigerator platform, the incoming electrical connections, and the host lattice. There are efforts worldwide to reach sub-millikelvin electron temperatures in nanostructures to study coherent electronic phenomena and improve the operation of nanoelectronic devices. On-chip magnetic cooling is a promising approach to meet this challenge. The method can be used to reach low, local electron temperatures in other nanostructures, obviating the need to adapt traditional, large demagnetisation stages. We demonstrate the technique by applying it to a nanoelectronic primary thermometer that measures its internal electron temperature. Using an optimised demagnetisation process, we demonstrate cooling of the on-chip electrons from 9 mK to below 5 mK for over 1000 seconds.
Original languageEnglish
Article number45566
JournalScientific Reports
Volume7
DOIs
Publication statusPublished - 4 Apr 2017
MoE publication typeA1 Journal article-refereed

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magnetic cooling
chips
demagnetization
electrons
electron energy
cooling
refrigerators
thermometers
scattering
dilution
baths
phonons
platforms
copper
nuclei
silicon
thin films
electronics

Cite this

Bradley, D. I., Guénault, A. M., Gunnarsson, D., Haley, R. P., Holt, S., Jones, A. T., ... Roschier, L. (2017). On-chip magnetic cooling of a nanoelectronic device. Scientific Reports, 7, [45566]. https://doi.org/10.1038/srep45566
Bradley, D. I. ; Guénault, A.M. ; Gunnarsson, D. ; Haley, R.P. ; Holt, S. ; Jones, A.T. ; Pashkin, Yu.A. ; Penttilä, J. ; Prance, J.R. ; Prunnila, M. ; Roschier, L. / On-chip magnetic cooling of a nanoelectronic device. In: Scientific Reports. 2017 ; Vol. 7.
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Bradley, DI, Guénault, AM, Gunnarsson, D, Haley, RP, Holt, S, Jones, AT, Pashkin, YA, Penttilä, J, Prance, JR, Prunnila, M & Roschier, L 2017, 'On-chip magnetic cooling of a nanoelectronic device', Scientific Reports, vol. 7, 45566. https://doi.org/10.1038/srep45566

On-chip magnetic cooling of a nanoelectronic device. / Bradley, D. I.; Guénault, A.M.; Gunnarsson, D.; Haley, R.P.; Holt, S.; Jones, A.T.; Pashkin, Yu.A.; Penttilä, J.; Prance, J.R.; Prunnila, M.; Roschier, L.

In: Scientific Reports, Vol. 7, 45566, 04.04.2017.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Bradley, D. I.

AU - Guénault, A.M.

AU - Gunnarsson, D.

AU - Haley, R.P.

AU - Holt, S.

AU - Jones, A.T.

AU - Pashkin, Yu.A.

AU - Penttilä, J.

AU - Prance, J.R.

AU - Prunnila, M.

AU - Roschier, L.

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N2 - We demonstrate significant cooling of electrons in a nanostructure below 10 mK by demagnetisation of thin-film copper on a silicon chip. Our approach overcomes the typical bottleneck of weak electron-phonon scattering by coupling the electrons directly to a bath of refrigerated nuclei, rather than cooling via phonons in the host lattice. Consequently, weak electron-phonon scattering becomes an advant-age. It allows the electrons to be cooled for an experimentally useful period of time to temperatures colder than the dilution refrigerator platform, the incoming electrical connections, and the host lattice. There are efforts worldwide to reach sub-millikelvin electron temperatures in nanostructures to study coherent electronic phenomena and improve the operation of nanoelectronic devices. On-chip magnetic cooling is a promising approach to meet this challenge. The method can be used to reach low, local electron temperatures in other nanostructures, obviating the need to adapt traditional, large demagnetisation stages. We demonstrate the technique by applying it to a nanoelectronic primary thermometer that measures its internal electron temperature. Using an optimised demagnetisation process, we demonstrate cooling of the on-chip electrons from 9 mK to below 5 mK for over 1000 seconds.

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Bradley DI, Guénault AM, Gunnarsson D, Haley RP, Holt S, Jones AT et al. On-chip magnetic cooling of a nanoelectronic device. Scientific Reports. 2017 Apr 4;7. 45566. https://doi.org/10.1038/srep45566