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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.
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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