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We report experimental demonstration of the feasibility of reachingtemperatures below 1 mK using cryogen-free technology. Our prototype systemcomprises an adiabatic nuclear demagnetisation stage, based onhyperfine-enhanced nuclear magnetic cooling, integrated with a commercialcryogen-free dilution refrigerator and 8 T superconducting magnet. Thermometrywas provided by a current-sensing noise thermometer. The minimum temperatureachieved at the experimental platform was 600 {\mu}K. The platform remainedbelow 1 mK for over 24 hours, indicating a total residual heat-leak into theexperimental stage of 5 nW. We discuss straightforward improvements to thedesign of the current prototype that are expected to lead to enhancedperformance. This opens the way to widening the accessibility of temperaturesin the microkelvin regime, of potential importance in the application ofstrongly correlated electron states in nanodevices to quantum computing.

A microkelvin cryogen-free experimental platform with integrated noise thermometry