liquid helium based Helium-3 cryostats with superconducting magnet
he bath cryostat with 3He insert
temperature range: 0.3 . . 100 K
attoDAMP & base temp. operation with 1 K pot OFF
lowest vibration cryostat available for LT-SPM
fast 3He recondensing & long hold time
fast turnaround & extended base temp. operation
The attoLIQUID3000 is a liquid helium based cryostat with a 3He-insert for operation at temperatures from < 350 mK to 300 K. The system is equipped with special low resistance wiring for attocube positioners used in our microscopes, as well as a number of coaxial lines and twisted pairs for customer use. It can be equipped with your choice of superconducting magnet, be it a single solenoid, split coil or 2D/3D vector magnet including suitable magnet power supply. All necessary components needed for a convenient operation are included, such as the renowned attoDAMP anti-vibration cabinet with acoustic damping, a suitable pump for the 1 K pot, a multi-channel temperature controller, a liquid helium level meter and probe, a transfer line and all necessary vacuum fittings.
The most outstanding feature of this system is that the 1 K pot is only needed to be pumped during recondensation of the 3He. Afterwards, the unique design allows to turn off the pump at the 1 K pot, which minimizes the residual vibrations considerably. This is what enables the use of sensitive techniques such as scanning probe microscopy in this cryostat at mK temperatures with proven performance (see application section).
|technology||liquid helium bath cryostat with 3He insert, vacuum isolation, vapor shielded, LN2 shielded optional|
|liquid helium dewar||50 l capacity, liquid nitrogen shield (capacity 45l)|
|sample environment||cryogenic vacuum, sample cooled via braids|
|sample space||2" diameter probe bore fitting all attocube inserts|
|vibration & acoustic noise damping system||dewar isolated and suspended in attoDAMP cabinet|
|base temperature||approx. 270 mK (1 K pot ON, no load), approx. 350 mK (1 K pot OFF, incl. microscope).|
|estimated liquid helium static loss rate||< 0.35 l/h (incl. microscope and wiring)|
|cool down time of sample||approx. 3 h|
|cool down time of system (system incl. 9 T magnet)||approx. 6 .. 24 h|
|cool down time of system (system without magnet)||approx. 6 .. 24 h|
|³He regeneration time||typ. 30 min|
|temperature stability||± 3 mK for T < 1.2 K|
|cooling power at sample location||approx. 150 µW @ 350 mK for 12.5 hours(1 K pot ON, no load)|
|additional heat load when scanning||approx. 10-15 µW per µm/s scan speed|
|thermometry||control thermometer on charcoal sorption pump, thermometer on 1 K pot with standard calibration, RuO2 thermometer on ³He pot|
|Size and Dimensions|
|cryostat (width x depth x height)||800 x 800 x 1800 mm³ (including attoDAMP; depending on magnet choice)|
|required min. ceiling height||approx. 3.40 m plus crane (depending on magnet)|
|optional electronics rack (width x depth x height)||640 x 640 x 1350 mm³|
|Options and Upgrades|
|superconducting magnet||solenoids: 7, 9, 12 T, vector magnets: e.g.: 8/2 T, 9/3 T, 9/1/1 T, ...|
|bipolar magnet power supply||included (with optional magnet)|
|pumping kit||1 K pot pumping kit included|
|helium transfer line||included|
|helium lever meter||included|
|confocal microscopes||attoCFM II, attoCFM III|
|atomic force microscopes||attoAFM I , AFM upgrade options (MFM, KPFM, PFM, conductive-tip AFM), attoAFM III, attoAFM/STM|
|scanning Hall probe microscopes||attoSHPM|
|combined atomic and confocal microscope||attoAFM/CFM (on request)|
Fields of Applications
Imaging and scanning probe microscopy of surface properties on the nanoscale at variable temperatures down to milli Kelvin and combination with high magnetic fields.
Systems for microscopy and nanoscale analysis of material properties at ambient and low temperature and in high magnetic fields.
Magnetotransport measurements on mesoscopic structures at variable temperatures and in high magnetic fields.
Optics and Spectroscopy
Confocal microscopy and nanoscale spectroscopy at low temperatures and in high magnetic fields on quantum dots, NV centers, 2D materials, nanowires and other materials.
Quantized Conduction on Domain Walls of a Magnetic Topological Insulator
Dynamic Visualization of Nanoscale Vortex Motion using attoSTM in an attoLiquid3000
Imaging fractional incompressible stripes in integer quantum Hall effect
Imaging Fractional Incompressible Stripes in Quantum Hall Systems
Scanning Gate Microscopy at 300 mK
Scanning Tunneling Spectroscopy and Vortex Imaging on NbSe2 with attoAFM III / STM I at 315 mK
Dr. S. Heun
Instituto Nanoscienze-CNR and Scuola Normale Superiore, Pisa
The attoLIQUID3000 with the attoDAMP anti-vibration cabinet has been serving us very well as mK platform for scanning gate microscopy since 2008. Its handling is straightforward and easy, and due to the special 1 K pot design, vibrations are of no big concern even at base temperature.