The study of thermal effects, both classical and quantum, at cryogenic temperatures requires the use of on-chip, local, high-sensitivity thermometry. Carbon-platinum composites fabricated using focused ion beam (FIB) assisted deposition form a granular structure which is shown in this study to be uniquely suited for this application. Carbon-platinum thermometers deposited using a 24 pA ion beam current have high sensitivities below 1 K, comparable to the best cryogenic thermometers. In addition, these thermometers can be accurately placed to within 10s of nanometers on the chip using a mask-free process. Furthermore, they also have a weak magnetic field dependence, 3% change in resistance with applied magnetic fields from 0 to 8 T. Finally, these thermometers are integrable into a variety of nanoscale devices due to the existing wide spread use of FIB.
Blagg, Kirsten, et al. "Focused ion beam deposited carbon-platinum nanowires for cryogenic resistive thermometry." Carbon, vol. 169, Aug. 2020. https://doi.org/10.1016/j.carbon.2020.06.087
@article{osti_1650157,
author = {Blagg, Kirsten and Allen, Portia and Lu, Tzu-Ming and Lilly, Michael P. and Singh, Meenakshi},
title = {Focused ion beam deposited carbon-platinum nanowires for cryogenic resistive thermometry},
annote = {The study of thermal effects, both classical and quantum, at cryogenic temperatures requires the use of on-chip, local, high-sensitivity thermometry. Carbon-platinum composites fabricated using focused ion beam (FIB) assisted deposition form a granular structure which is shown in this study to be uniquely suited for this application. Carbon-platinum thermometers deposited using a 24 pA ion beam current have high sensitivities below 1 K, comparable to the best cryogenic thermometers. In addition, these thermometers can be accurately placed to within 10s of nanometers on the chip using a mask-free process. Furthermore, they also have a weak magnetic field dependence, 3% change in resistance with applied magnetic fields from 0 to 8 T. Finally, these thermometers are integrable into a variety of nanoscale devices due to the existing wide spread use of FIB.},
doi = {10.1016/j.carbon.2020.06.087},
url = {https://www.osti.gov/biblio/1650157},
journal = {Carbon},
issn = {ISSN 0008-6223},
volume = {169},
place = {United States},
publisher = {Elsevier},
year = {2020},
month = {08}}