Cellule de mesure nanocalorimétrique par méthode alternative en parylène autosuspendu

Emmanuel Andre*, Aitor Lopeandia, Jean Luc Garden, Dominique Givord, Olivier Bourgeois

*Autor corresponent d’aquest treball

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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 contribucióParylene self-suspended measurement cell by nanocalorimetric alternative method
Idioma originalFrench
Pàgines (de-a)89-106
Nombre de pàgines18
RevistaInstrumentation Mesure Metrologie
Volum11
Número3-4
DOIs
Estat de la publicacióPublicada - 2011

Keywords

  • AC calorimetry
  • GdAl
  • Microcalorimetry
  • Microfabrication
  • Nanocalorimetry
  • Parylen
  • Sensors

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