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

    Fingerprint

    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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    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.",
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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.

    PY - 2017/4/4

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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.

    AB - 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