Membrane-based calorimetry for studies of sub-microgram samples
2009 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 150, 052256- p.Article in journal (Refereed) Published
We have developed a membrane-based microcalorimeter for general measurements of heat capacity and latent heat using a combination of ac steady-state and relaxation methods. The differential calorimeter is designed for sub-microgram samples studied over a wide range of temperatures and magnetic fields. The device is based on free-standing silicon nitride membranes of 150 nm thickness onto which thin film heaters and temperature sensors are fabricated. While production-line fabrication may benefit from back-etching as a final step, it is often easier to start with pre-etched membranes in a research laboratory. With selected nano-fabrication methods this is possible. Due to a robust heater and very low thermal conductance of the final calorimeter, the sample can be heated to more than 100 K above base temperature. This enables instantaneous calibration, and makes the device capable of being used for ultra-fast temperature control, relaxation studies, and measurements that combine good absolute accuracy, high resolution, and information on latent heat.
Place, publisher, year, edition, pages
2009. Vol. 150, 052256- p.
Condensed Matter Physics
Research subject Physics
IdentifiersURN: urn:nbn:se:su:diva-33661DOI: 10.1088/1742-6596/150/5/052256OAI: oai:DiVA.org:su-33661DiVA: diva2:283329