Ultralow Temperature On-chip Magnetic Refrigeration

Prance, Jonathan (2026) Ultralow Temperature On-chip Magnetic Refrigeration. In: 2026 10th IEEE Electron Devices Technology & Manufacturing Conference (EDTM) :. IEEE, MYS. ISBN 9798331585990

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Abstract

Recent experiments have shown that adiabatic demagnetization refrigerators can be miniaturized and integrated with small electronic devices to reach on-chip electron temperatures below 1 mK [1]–[4]. Magnetic cooling with an external refrigeration stage can also achieve similar temperatures for samples with very low contact resistances [5]. Alongside the possibility of studying electronic properties of devices and materials in a new regime, the ability to cool far below 10 mK will have practical benefits for quantum technologies, metrological standards and sensors.On-chip magnetic cooling has so far been applied to a small range of devices. For the technique to become widely applicable, more work is needed to understand the heat flows between materials and the thermal subsystems at the micro- and nanometer scale. On-chip cooling provides new ways to measure thermal properties such as electron-phonon coupling and boundary resistances [6]. Here we review the state-of-the-art in on-chip magnetic cooling and discuss recent progress towards making the technique more broadly applicable.