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/vHz @ 4 K and 40 µA Hall current, 80 nT/vHz @ 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

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

Compatibility with Electronics

scan controller and software

ASC500 (for detailed specifications please see attoCONTROL section)

Options and Upgrades

closed loop scanning & global sample coordinates

interferometric encoders for scan linearization and closed loop sample navigation

ultra-large scan range upgrade

80 x 80 µm² @ 300 K, 125 x 125 µm² @ 4 K

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, resolution approx. 20 µm (depending on cryostat

closed loop upgrade for coarse positioners

resistive encoder, range 5 mm, sensor resolution approx. 200 nm, repeatability 1-2 µm