Selected Applications
scanning gate microscopy at mK
PRODUCT KEY FEATURES
• dry dilution refrigerator, BF-XLD250, with 80 mm
toploading insert
• base temperature (DR): < 10 mK (typical 8 mK)
• cooling power (DR): >250 µW@100 mK (typical 300 µW@100 mK)
• cooling power (sample location in toploading probe): >100 μW @ 100 mK
• base temperature (microscope): < 20 mK
• turnaround time (empty toploading probe): 6-8 h (typical)
• turnaround time (toploading probe with AFM): 9-11 h (typical)
• magnet: 5 T/1 T/1 T
• customized attoAFM III for mK operation
• modular microscope also compatible with attoDRY1000/1100/2100
• sample holder for 20 pin leadless ceramic chip carriers (LCCC)
attoAFM I Mounted on Mixing Chamber
This scan above nicely demonstrates the stability of a complete system, an
attoAFM I together with a LD400 cryo-cooler from BluFors Cryogenics. For
this 25 x 25 μm² (800 x 800 pixel) scan, the pulse-tube cooler was enabled the
whole time. The temperature was stable at ~40 mK measured at the mixing
chamber – it was slightly higher due to the higher scan speed of close to 1 μm/s.
5 µm
(attocube applications in collaboration with BluFors Cryogenics, 2014)
attoAFM III in Toploading Insert
2 µm
This data was taken with a tuning fork attoAFM III specifically designed for mK
operation. The extremely sensitive microscope was mounted on a toploading
insert (see images and project description on the left page), which ensures
a much higher usability in terms of turnaround times upon tip and sample
exchange than if it were mounted directly on the mixing chamber. The sample
temperature in the toploading DR was 55 mK during the scan at 100 nm/s. The
images nicely demonstrates that the delicate microscope works reasonably well
even under these extreme conditions.
attoMICROSCOPY
Sophisticated Tools for Science
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