Thermal Transport in Nanoelectronic Devices Cooled by On-Chip Magnetic Refrigeration

Autti, S. and Bettsworth, F. C. and Grigoras, Kestutis and Gunnarsson, D. and Haley, R. P. and Jones, A. T. and Pashkin, Yuri and Prance, J. R. and Prunnila, M. and Thompson, M. D. and Zmeev, D. E. (2023) Thermal Transport in Nanoelectronic Devices Cooled by On-Chip Magnetic Refrigeration. Physical review letters, 131 (7): 077001. ISSN 1079-7114

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Abstract

On-chip demagnetization refrigeration has recently emerged as a powerful tool for reaching microkelvin electron temperatures in nanoscale structures. The relative importance of cooling on-chip and off-chip components and the thermal subsystem dynamics are yet to be analyzed. We study a Coulomb blockade thermometer with on-chip copper refrigerant both experimentally and numerically, showing that dynamics in this device are captured by a first-principles model. Our work shows how to simulate thermal dynamics in devices down to microkelvin temperatures, and outlines a recipe for a low-investment platform for quantum technologies and fundamental nanoscience in this novel temperature range.