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Sample mounting

General

Several sample holders are available.

The base plate, which is the same for all sample holders, is grounded, but sample can is mounted on two insulated supports with electrical contacts, each of them is tightened by two Mo M1.2 nuts. It allows sample to be heated and/or grounded or biased.

The thermocouple (K-type, chromel-alumel) can touch the sample from the backside.

The design can be further developed depending on sample properties and user requirements (cooling, heating, thermocouple...).



Sample holder selection table


Sample requirements Plain mounting Crystals Silicon wafer Pocket with clamps Sapphire plates STM type
number of samples on one holder up to 12 1 1 1 1 1
can be grounded yes yes yes yes yes yes
can be biased no yes yes yes no yes
annealing up to 400 °C (700 K) no yes yes yes yes yes
annealing up to 1000 °C (1300 K) no yes yes yes no yes
measurement during annealing  ≤400 °C (700 K) no yes no yes yes yes
measurement during annealing  ≥400 °C (700 K) no no no no no yes
maximum annealing current 15 A 10 A 15 A 5 A 5 A

Sample mounting

  1. Mount the sample(s) on the selected holder.
  2. Check that all nuts are properly tightened. Do not exagerate with the force in order not to break the fragile ceramic insulators.
  3. Measure the distances in red circles in the above drawing for both heating pins and both thermocouple pins. At the moment (Nov 2017] the heating pins should be a bit higher than the indicated 3.5 mm, practically between 3.6 and 3.7 mm.
  4. Check electrical connections (if installed):
    • sample to ground: infinity resistance, depending on the cleanliness of the ceramic insulators, practically several kΩs
    • heating element contacts: low resistance, <1Ω for metals, higher for Si wafers
    • thermocouple contacts: low resistance, several Ωs at maximum
    • sample to thermocouple: low resistance, several Ωs at maximum
  5. Blow out any dust from the sample surface.
  6. Proceed with sample insertion.
Last Updated on Monday, 22 July 2019 14:10