attoAFM /STM
PAGE 130
Specifications
attoAFM/STM
General Specifications
type of instrument
tuning-fork based AFM with wire-type tip, capable of non-contact mode AFM and STM
sensor head specifics
etched metal wires, e.g. Pt/Ir or Tungsten wire
(also compatible with NaugaNeedles commercial tips)
Operation Modes
imaging modes
non-contact mode AFM, EFM, SGM, STM, STS
slope compensation
2 axis scan plane correction
z feedback
AFM: PI feedback loop for amplitude modulation (AM), phase modulation (PM) or frequency
modulation (FM) using included PLL
STM: constant current, cons
Resolution*
measured z-noise density
< 16 pm/√Hz
tunneling current noise
< 40 fA/√Hz @ 7 kHz bandwidth (out of contact)
z bit resolution @ 4 K
7.6 pm at 2 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
40 x 40 x 4.2 μm³ @ 300 K
9 x 9 x 2 μm³ @ 4 K
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
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 attoAFM /STM microscope stick