Resum
We report the microfabrication and operation of a highly sensitive ac-calorimeter designed to characterize small mass magnetic systems operating at very low frequencies (from 0.1 to 5 Hz) in a temperature range from 20 to 300 K. The calorimetric cell is built in the center of a 500 nm thick polymeric membrane of parylene held up by a Cu frame. With these characteristics the frequency of adiabaticity is typically around few hertz and energy exchanges as small as 1pJ can be detected. Measurements have been performed on Co/Au thin films and on the GdAl 2 microcrystal where the ferromagnetic phase transition is clearly evidenced.
Títol traduït de la contribució | Parylene self-suspended measurement cell by nanocalorimetric alternative method |
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Idioma original | French |
Pàgines (de-a) | 89-106 |
Nombre de pàgines | 18 |
Revista | Instrumentation Mesure Metrologie |
Volum | 11 |
Número | 3-4 |
DOIs | |
Estat de la publicació | Publicada - 2011 |
Keywords
- AC calorimetry
- GdAl
- Microcalorimetry
- Microfabrication
- Nanocalorimetry
- Parylen
- Sensors