attoSHPM
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Specifications
attoSHPM
General Specifications
type of instrument
Scanning Hall Probe Microscope with STM tip for tip-sample distance control
sensor head specifics
MBE grown hall cross sensor (GaAs/AlGaAs heterostructure) on a 2-axis tiltable
sensor mount
Operation Modes
imaging modes
constant height
slope compensation
2 axis scan plane correction
z feedback
STM distance tracking (usually only for autoapproach)
Resolution*
size of Hall cross on sensor
400 nm (high resolution); 250 mm (ultra high resolution)
field sensitivity @ 4 K
1500 V/AT
noise-equivalent magnetic field (theoretical)
15 nT/√Hz @ 4 K and 40 μA Hall current
80 nT/√Hz @ 77 K and 40 μA Hall current
typical attainable field detection limit (measured)
15 μT typ. (bandwith 10 Hz @ frequency 277 Hz)
z bit resolution @ 4 K
57 pm at 15 μm scan range
Sample Positioning
total travel range
5 x 5 x 5 mm³ (open loop)
step size
0.05..3 μm @ 300 K, 10..500 nm @ 4 K
fine scan range
50 x 50 x 24 μm³ @ 300 K
30 x 30 x 15 μm³ @ 4 K
closed loop scanning
optional
sample holder
ASH/QE/4CX quick-exchange sample holder with 8 electrical contacts, integrated
heater calibrated temperature sensor
Suitable Operating Conditions
temperature range
1.5 K..300 K (dependent on cryostat); mK compatible setup available on request
magnetic field range
0..15 T+ (dependent on magnet)
operating pressure
designed for He exchange gas (vacuum compatible version down to 1E-6 mbar on
request)
Suitable Cooling Systems
titanium housing diameter
48 mm
bore size requirement
designed for a 2" (50.8 mm) cryostat/magnet bore
compatible cryostats
attoDRY1000/1100/2100
attoLIQUID1000/2000/3000/5000
Electronics
scan controller and software
ASC500 (for detailed specifications please see attoCONTROL section)
Options
closed loop upgrade for coarse positioners
resistive encoder, range 5 mm, sensor resolution approx. 200 nm, repeatability 1-2
μm
in-situ inspection optics
tip/sample monitoring via in-situ LT-LED for illumination, mirrors, lenses and CCD
camera (outside of cryostat)
field of view approx. 3 mm x 2 mm, res
closed loop scanning upgrade
interferometric encoders available
* Resolution may vary depending on applied tip, sample, and cryostat
The attoSHPM microscope stick