A design and implementation of "in-cell" magnetic refrigeration to achieve sub-10 mK temperatures T in cryogen-free dilution refrigerators is presented. The ultra low temperatures below 5 mK are attained in finite magnetic fields B up to 1 T. The holding time below 5 mK varies between about 3 to 30 hours, depending on the final magnetic field after demagnetization process. The developed technique can be used to study low dimensional devices at ultra low electron temperatures in the High B/T regime.
@article{arxiv.2605.20462,
title = {Sub-10 mK "In-cell" Magnetic Refrigeration for Cryogen-free Cryostats},
author = {Alexander M. Donald and Nicolas Silva and Christopher J. Ollmann and Roch Schanen and Chao Huan and Sangyun Lee and Dominique Laroche and Richard P. Haley and Mark W. Meisel and Rasul Gazizulin},
journal= {arXiv preprint arXiv:2605.20462},
year = {2026}
}