attoDRY2200
automated toploading ultra-low vibrations cryostat for ultra-sensitive SPM measurements
the new benchmark in ultra-low vibration
makes liquid cryostat obsolete even for the sensitive AFM measurements
automated control via eNSPIRE electronics
web-server, live plotting & logging, versatile API
toploading probe with free-beam access in vector magnetic fields
versatile SPM platform for 2D materials research
A broader adoption of groundbreaking technologies and material systems like quantum sensing (ODMR), 2D magnets, and skyrmions, requires closed-cycle cryostats to reach a whole new level of evolution in vibration stability and to enable nanometer lateral resolution, while at the same time still offering variable magnetic fields.
The closed-cycle cryostat attoDRY2200 is attocube’s answer to those demanding requirements and will make the mentioned technologies more accessible to a broader community. Equipped with a proprietary ultra-efficient vibration-damping system, a choice of vector magnets, and an automated, user-friendly, variable temperature control, this cryostat is the best choice to implement state-of-the-art SPM measurements.
The attoDRY2200 offers a fully automated cooldown from 300K to a base temperature of down to 1.65K – and everything in between. Complimented by an automatic magnetic field control, the superconducting vector magnets make the maximum magnetic field over the whole temperature range easily accessible.
The unmatched cooling performance via exchange gas coupling provides an initial cooldown time of the complete system of around 15-20 hours, while the turn-around time during sample exchange is around 5-8 hours. The integrated touchscreen allows for conveniently setting the desired field (B) and temperature (T) without using a PC.
More elaborate measurement schemes such as programmable sweeps of B and T are easily possible via versatile application programming interfaces (APIs). The top-loading design enables a quick and easy sample exchange, while offering a generous sample space of 49.7 mm in diameter.
The closed-cycle cryostat attoDRY2200 constitutes a unique ultra-low vibration measurement platform for cryogenic scanning probe experiments without the need for liquid helium. By the additional damping system, the mechanical vibrations created by the pulse-tube coldhead are extremely efficiently decoupled from the sample space. Our internal application measurements have confirmed an extremely high lateral stability in our scanning probe microscopes. This allows for a lateral resolution in atomic force microscopy that matches or even outperforms the performance in previous liquid-helium-based variable-temperature magnet cryostats. The attoDRY2200 paves the way for ultra-sensitive SPM on hot topics such as 2D materials, domain walls, multiferroics or superconducting samples with nanostructures.
Selected Measurements
attoDRY2200 – the new benchmark for ultra-low vibration low-temperature SPM
High-resolution moiré pattern of twisted bilayer graphene (tBLG)
High-resolution moiré pattern of twisted bilayer graphene (tBLG)
To benchmark the performance of attoDRY2200, a conductive-tip AFM (ct-AFM) measurement on twisted bilayer graphene (tBLG) was conducted.
In our sample, two graphene sheets are twisted by an angle of 0.8°, which yields a moiré superlattice constant of 18 nm. The measurement clearly shows this moiré superlattice with lateral resolution at least as small as half of the distance between two superlattice nodes, i.e., in this case 9 nm.
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Vibrations on par with liquid cryostat
Vibrations on par with liquid cryostat
The comparison between attoDRY2200 and a liquid cryostat shows that the former outperforms the latter. The ct-AFM image of tBLG is even noisier in the liquid environment, confirming the excellent damping of vibrations in the attoDRY2200.
We would like to thank Jiacheng Zhu and Kin Fai Mak (Cornell University, USA) for preparing the sample, and Istvan Kezsmarki (University of Augsburg, Germany) for making his attoLIQUID2000 cryostat available to us.
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Ultra-sensitive measurements from 1.8 K to 300 K (hBN/graphene)
Ultra-sensitive measurements from 1.8 K to 300 K (hBN/graphene)
The attoDRY2200 is a variable temperature cryostat with maximum magnetic field being available at all temperatures.
Moreover, it features ultra-low vibrations in the entire temperature range. An example thereof is ct-AFM scan of hBN/graphene bilayer at 70 K.
One can see high-resolution moiré pattern with superlattice constant of 15 nm, and with lateral resolution of at least 7.5 nm.
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Ultra-sensitive quantum sensing
Ultra-sensitive quantum sensing
Nitrogen vacancy magnetometry (NVM) is a magnetic imaging technique providing ultimate magnetic field sensitivity via optical detection of magnetic stray fields. While the NV sensor is a single atomic-sized magnetic dipole, and therefore offers supreme sensing potential, in practice this potential can be harnessed only in a very stable environment.
The attoDRY2200 is the first dry cryostat that offers such an ultra-low-vibration environment, indispensable for low temperature NVM (LT-NVM).
To exemplify the performance of attoDRY2200 for ultra-sensitive quantum sensing, we show on the left a hyperspectral NVM image of magnetic domains in Ir/Fe/Co/Pt multilayer (sample courtesy of Prof. Anjan Soumyanarayanan, A*STAR, Singapore) at 2.8 K with a commercial NV tip from our collaborators QZabre.
Moreover, this measurement is the first LT-NVM measurement at cryogenic tempeartures, where an NV tip with the microwave antenna integrated in the same chip carrier has been used, which offers unique compactness and user-friendliness for ultra-sensitive cryogenic quantum sensing.
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Specifications
For a detailed definition of used terms and descriptions please visit our Closed-Cycle Cryostats Glossary
| General Specifications | |
|---|---|
| technology | ultra-low vibration, pulse-tube based closed-cycle cryostat, designed for scanning probe microscopy applications |
| sample environment | He exchange gas |
| sample space | 49.7 mm diameter probe bore fitting all attocube inserts |
| sample exchange | top loading system for quick access |
| usability | fully automated temp. and mag. field control via integrated touchscreen, web interface or LAN API |
| vibration & acoustic noise damping system | benchmark ultra-low vibration design |
| Performance Data | |
| temperature control | fully automated, including all pumps and valves, touchscreen & remote control via PC |
| temperature range | 1.8 .. 300 K (automated control) |
| base temperature | 1.65 .. 1.8 K (for standard inserts) |
| magnetic field control | via touchscreen, via remote control, via API |
| cool down time of sample | approx. 5 .. 8 h (depending on insert) |
| initial cool down time of system without insert (unattended) | 15 .. 20 h (system without magnet), 25 .. 30 h (incl. 9 T magnet) |
| Compressor | |
| power consumption | max. 9.0 kW, 7.2 kW steady state |
| cooling of compressor | water cooling (requires local infrastructure) |
| Size and Dimensions | |
| cryostat (width x depth x height) | 1450 x 793 x 1360 mm³ |
| required min. ceiling height | approx. 2.60 m (depending on magnet) |
| optional electronics rack (width x depth x height) | 640 x 640 x 1050 mm³ |
| weight | 420 .. 520 kg (depending on magnet) |
| Options and Upgrades | |
| superconducting magnet | solenoids: 9 T, vector magnets: 1/1/1 T, 5/1/1 T, 9/1/1 T |
| bipolar magnet power supply | included (with optional magnet) |
| temperature controller | included |
| pumping kit | turbomolecular pump with suitable backing pump for sample space preparation |
| Compatibility | |
| confocal microscopes | attoCFM I, attoCFM IV |
| atomic force microscopes | attoAFM I , AFM upgrade options (MFM, KPFM, PFM, conductive-tip AFM), attoAFM III |
| transport measurements | atto3DR |
Features
Dampers
next generation vibration damping optimized for sensitive LT-SPM
