Allen, PortiaBlagg, KirstenSingh, Meenakshi2023-11-212023-11-21https://hdl.handle.net/11124/178559https://doi.org/10.25676/11124/178559Thermal conductivity measurement techniques are extremely well established at room temperature, but become more challenging at cryogenic temperatures. The development of a dedicated thin film measurement platform for sub-Kelvin temperatures is explored here. Delicately suspended Si-N platforms ensure thermal isolation of the sample, while lithographically patterned Joule heaters provide a controllable temperature gradient across the platforms. A carbon-platinum (C-Pt) composite, fabricated using focused ion beam (FIB) assisted deposition, was patterned on the platforms as a local, resistive thermometer. These C-Pt thermometers are highly sensitive below 1K, and comparable to commercially available cryogenic thermometers. While suspended platforms have been used for thermal conductivity measurements before, the integration of highly sensitive, locally deposited cryogenic thermometers allows for more precise measurements over a wider temperature range.articlesengCreative Commons CC-BY License or the Creative Commons CC-BY-NC License.thermal conductivitycryogenicthin filmText