POLAR SPM Lab
Compact, Rigid and Low Helium Consumption Low Temperature SPM
- STM, QPlus®-AFM & Spectroscopy
- Integrated TRIBUS Head
- Excellent SPM Stability
- Minimum Temperature: T < 5 K
- Helium Holding Time: > 200h
- Vertical Magnetic Field: B = ± 5T
The Polar SPM Lab is a low-temperature Scanning Probe Microscope (SPM) for highest resolution STM, QPlus®-AFM, and spectroscopy experiments in a temperature range between < 5 K and 420 K and in high magnetic fields of up to 5T.
The ultra-compact design of the cryostat with a height of < 60cm ensures an immense mechanical stiffness and thus results in an excellent STM stability.
The hold time is optimised through a series of thermal decoupling stages to deliver an extremely low helium consumption of less than 1 litre per 24 hours and a hold time of > 200 hours at < 5 K.
The hold time is optimised through a series of thermal decoupling stages and thermal radiation shields, designed to deliver an extremely low helium consumption. With a liquid helium (LHe) consumption of less than 1 litre per 24 hours, the instrument achieves a hold time of > 200 hours at < 5 K before the cryostat needs to be reﬁlled. Alternatively, the SPM can be operated with liquid nitrogen (T < 79 K). Viewports and closable entry doors in the radiation shields allow for SPM in-situ tip/sample exchange, optical access or in-situ evaporation. The low helium consumption oﬀers both an economic beneﬁt and permits long term measurement sessions.
The heart of the multi -application POLAR SPM is the TRIBUS SPM head. It is integrated into a compact bath cryostat system and employs a spring suspension and eddy current damping system for optimum mechanical decoupling. The TRIBUS SPM has a 3D (X/Y/Z) motor for tip and sample navigation, is extremely mechanically stable and offers numerous access ports for optical observation, in-situ sample and probe exchange and evaporation onto the sample/ substrate. An effective thermal shielding in combination with the compact design and short mechanical loops, and a high symmetry within the STM head are responsible for a very low relative drift between sample and measurement probe. Up to 10 additional electrical contacts to the sample extend the range of possible measurement modes. The proven Omicron sample plate design ensures the compatibility with existing SPM instrumentation and transfer systems. As an option, a superconducting coil for vertical ﬁelds of ± 5T can be offered for the POLAR SPM. The UHV compatible dry magnet is mounted at the bottom of the helium cryostat. In combination with tip/sample preparation (heating, ion etching, evaporation…) the POLAR facilitates a wide range of SPM operation modes including STM, QPlusAFM, Spin Polarized Tunneling as well as related spectroscopy (STS, I/V, dI/dV, df(V), force spectroscopy, IETS, …) experiments.
Si(111) 7x7 @ 4.8 K
Au(111) @ 4.7 K
Pb(100) @ 4.5 K. Data courtesy of Thomas Gardenier and Ingmar Swart, University of Utrecht, NL
STM: Manipulation of CO molecules on Cu(111) @ 4.5 K. Data courtesy of Jesper Moes, Thomas Gardenier and Ingmar Swart, University of Utrecht, NL
QPlus AFM at high magnetic Fields
QPlus®: NaCl(001) @ B = 5T and @4.35 K
Variants of the POLAR SPM
Due to the unique and modular platform, the POLAR can be offered in several variants:
- POLAR: cost efficient entry model with > 100h helium hold time
- POLAR XT: premium cryostat with > 200h helium hold time
- POLAR 5T: Polar with vertical magnetic field of up to B =5T
An on-site upgrade from POLAR to POLAR XT or to POLAR 5T is always possible.
The rigid and compact cryostat has a height of less than 60cm. Tis unique concept enables a very compact UHV system design with extremely small foortprint and heigth.
Height of the Polar SPM Lab
Less than 2m total height makes the Polar SPM the most compact low temperature SPM on the market.
Sample Plates and Sensors
- Standard flag style sample plates (various sample plates available)
- Secure tip/sample handling and exchange via wobble stick
- QPlus® sensor or STM tip carrier
- Electrical sample plate with 10+1 electrical contacts
< 5 K
atomic resolution on Au(111) @ T < 5K
atomic resol. on NaCI or Si(111) 7x7 @ T < 5 K
< 0.2 nm/h
> 200 hours
BZ = ± 5T
4 or 10 electrical sample contacts
STM tip preparation tool
Customised preparation chamber
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