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attoAFM/STM
combined low temperature atomic force and scanning tunneling microscope, tuning fork based
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In the attoAFM/STM, the two worlds of atomic force and scanning tunneling microscopy are genuinely combined. In contrast to the attoAFM III, the attoAFM/STM uses a horizontally aligned tuning fork to reduce unshielded tunneling current wire length to a minimum (several millimeters in this case).
With this instrument, scanning tunneling spectroscopy measurements on generally non-conductive samples with conductive patches finally become possible.
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01 LT and HV compatible feedthroughs
02
vacuum window
03 microscope insert
04 superconducting magnet (optional)
05 liquid He dewar (optional)
06 ultra stable Titanium housing
07 xyz coarse positioners
08 xy scanner
09 sample
10 tuning fork including LT compatible preamplifier |
Scheme of a cryogenic AFM/STM insert including cryostat and superconducting magnet.
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Principle - The attoAFM/STM typically uses an ultra-sharp etched tungsten tip as a probe. The tip is glued onto the tuning fork and electrically connected to a current/voltage amplifier located on top of the experiment. A low temperature, high-vacuum compatible coaxial cable is used for this connection, guaranteeing minimum noise pickup. The instrument can be operated in AFM, STM, or combined AFM & STM mode.
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Available
Controller for this Product:
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FPGA-based, fully digital SPM controller
with xy-scan generator incl. feedback control und phase locked loop (PLL)
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| ANC350 |
Piezo positioning controller
for attocube's encoded positioners| |
| ANC300 |
Piezo positioning controller
for attocube's open-loop positioners | |
Complete
System Solutions:
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Complete system
configurations for this product. |
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| Product
Key Features
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ultra compact SPM head with unprecedented stability
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AFM: highly sensitive, non-optical tuning fork sensor in horizontal alignment
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STM: low temperature compatible, low capacitance coaxial wiring for minimum noise pickup |
| Benefits
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ultra
high resolution imaging in non-contact mode |
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high Q factor
for highest sensitivity measurements |
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optimized S/N
ratio due to LT compatible preamplifier |
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ultra low-noise tunneling current (< 40 fA/Hz1/2 in a 7 kHz BW) |
| Tuning fork AFM image of SrTiO3 recorded at 350 mK with the attoAFM/STM (attocube application labs, 2009). |
| STS vortex imaging on NbSe2* at 315 mK and 1 T magnetic field. The image was recorded at a bias voltage of 1.4 mV (attocube application labs, 2009). |
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