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attoSPHERE
ultra compact scanning tunneling microscope, table-top ready
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The attoSPHERE is a scanning tunneling microscope, designed particularly for room temperature application in demanding conditions, including variable temperature environments and facilities with non-ideal mechanical damping. With its unique material combination, almost exclusively consisting of Invar and ceramics, and its thermally compensated cylindrical design, the attoSPHERE allows the user to obtain atomic resolution images in no time - even in non-ideal lab conditions. With its plug-andmeasure capabilities, the attoSPHERE is ideally suited for topographic and spectroscopic measurements, rapid process control, failure analysis in nanoelectronics, and fundamental research applications. The attoSPHERE is compatible with the highest class cleanrooms and high vacuum conditions.
Principle - The attoSPHERE consists of a cylindrical microscope head which rests self-centered on a sample platform. The microscope head can simply be lifted off for rapid sample exchange. A specifi cally developed coarse positioner allows to approach the STM tip with highly repetitive steps of 75 nm size towards the sample. A fast feedback loop and high repition rates allow to conduct this coarse approach in a matter of minutes.
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| Schematic drawing of the attoSPHERE |
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The attoSPHERE can simply be disassembled by
lifting off the self-aligning microscope head
from the sample platform |
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Tip and sample are magnetically fixed to the
sample platform and scan tube, respectively. |
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Tip and sample can be removed in a matter of
seconds. |
SPECIFICATIONS
| MICROSCOPE SETUP |
STM sensor unit
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cut or etched metal tip; optical access for tip-sample approach |
| STM tips |
Pt/Ir or W wire, typically 250-500 μm diameter |
| current detection |
low noise amplifier with variable gain and bandwidth |
| gain range |
1E3 .. 1E11 V/A |
| sample bias |
bias voltage applied to tip; current measured at the sample |
| bias voltage range |
±10 V |
| bias output noise (using ASC500) |
100 μVpp (10 Hz - 100 kHz)
20 μVpp (10 Hz - 1 kHz) |
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| OPERATION MODE |
| feedback modes |
constant current, constant height |
| spectroscopy modes |
current-distance (I/z), current-voltage (I/V), conductance (dI/dV),
point contact spectroscopy |
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| SAMPLE POSITIONING |
| positioners and scanners |
modified coarse positioner with piezo scan tube |
| coarse range |
5 mm |
| step size (300 K) |
0.05 .. 1.5 μm, 75 nm at 30 V during coarse approach |
| scan range |
1.4 x 1.4 μm² |
| sample monitoring |
sample / tip monitoring via CCD camera (optional) |
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| OPERATING CONDITIONS |
| temperature range |
300 .. 400 K |
| operating pressure range |
1E-6 mbar .. 1 bar |
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| DIMENSIONS |
| diameter x height (microscope head) |
32.5 mm x 43 mm |
| diameter x height (sample platform) |
35 mm x 7 mm |
| maximum sample size |
Ø 10 mm or 7 mm x 7 mmm |
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| SCAN CONTROLLER |
| ASC500 SPM controller |
for detailed specifications please see attoCONTROL section |
Request Quotation & Support : |
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| Product
Key Features
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compensated Invar/ceramics design for minimal
drift in variable temperature environments
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extremely high resonance frequencies due to
ultra compact size and rigid design |
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place-and-operate functionality |
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solid-liquid interface investigations |
| Benefits
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atomic resolution STM/STS measurements even under non-ideal environmental conditions |
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rapid sample exchange and coarse approach for ultra-fast turn-around times |
| Application Examples
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STM/STS measurements in fundamental
research applications |
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rapid process control for nanodevices and
nanoelectronics |
| STM topograph of highly oriented pyrolytic graphite (HOPG). Settings: bias = 10 mV,IT= 1.47 nA, 220 nm/s (26.2 s / frame) (attocube application labs 2010). |
| STM topograph of a supramolecular hostguest system at the liquid solid interface. Coronene molecules (COR, C24H12) are adsorbed within the porous of the host matrix which is comprised of trimesic acid molecules (TMA, C9H6O6). Settings: bias = 833 mV, IT = 61 pA, 475 nm/s (41.94 s / frame) (attocube application labs 2010).. |
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