specs product brochure - specs surface nano analysis gmbh
TRANSCRIPT
Components for Surface Analysis
Tyto™
Applications � Atomic Scale SPM � Nano- & Quantum Devices � Extended and Combined SPM
Precision SPM Head
Features � Modular Design � Three Shielded Contacts to Sensor � Kinematic Sensor and Sample Mount � Direct Sensor Swapping � Extremely Rigid Titanium Casing � Thermally Compensated Design � Capacitive Position Sensor � Rigid and Precise Piezo Motors
Customized Systems and Solutions
Surface Analysis and Preparation Components
Nanostructures and Thin Film Deposition
Surface Science Applications
Modular SPM Head for Advanced Imaging and
Spectroscopy With Various Sensors
The new Tyto scan head from SPECS is a milestone in the
technology of Scanning Probe Microscopy. The modular
design allows for various experimental configurations
and for the usage of different sensors. A kinematic mount
is used for both the sample and sensor and this feature
is combined with accurate position sensors. For the first
time, this enables different sensors to access identical
locations on a sample and to repeat the procedure af-
ter successive sample preparation steps. This opens up
opportunities for new experiments and will advance the
research of surfaces at the nanometer scale.
Innovative Sensor Mount Design
The key feature of the new Tyto scan head is the pat-
ent pending sensor receptor: the Tyto-Claw™. Until now,
the means of mounting SPM sensors on a scan tube
has represented a significant challenge. Ideally, the
mount should be lightweight and non-magnetic with
good electrical, thermal, and mechanical contact, and
it should allow the sensor to be easily changed in UHV.
Solutions with magnetic holding have the drawback
that they are not compatible with magnetic fields and
have poor mechanical anchorage. The keyhole principle
to replace the sensor with a special carrier in the sample
insert is cumbersome as the sample has to be removed
and reinserted. Pushing the sensor under spring clamps
with a wobble stick creates the risk of breaking the scan
tube because of the associated high torque and results
in wear of the metallic springs.
The new Tyto-Claw provides a new and innovative solu-
tion: it has a rigid mount that allows precise kinematic
holding, three shielded electronic contacts and six solid
metal springs for grounding and thermalisation. The
sensor is well shielded from the piezo tube below and
insertion is performed without any friction from metallic
springs or contacts. The Tyto-Claw is completely non-
magnetic, lightweight and easy to replace when neces-
sary. The Tyto-Claw accepts any kind of electrical sensor
including tunneling tip, KolibriSensor, Tuning Fork Sen-
sors, Qplus and Akiyama as well as any piezoelectric or
piezoresistive sensors.
Kinematic Sample and Sensor Mount
The sensor and the sam-
ple are kinematically
mounted on three sap-
phire balls in three radial
grooves (Maxwell geome-
try). This greatly increases
the mechanical stability, avoids rattling the sample or
sensor plate and increases the performance of oscillat-
ing sensors. The biggest advantage for users is the abil-
ity to remove and replace a sample or sensor and to
return to the same spot on the sample within the area of
the scan field. This allows the investigation of the same
atom, molecule or defect following successive sample
preparation steps. In combination with the precise posi-
tion sensors, it also allows imaging of the same spot
on the sample with different sensors, once their relative
offsets are known.
1: The Tyto-Claw is mounted at the end of the scan tube. It features three ruby balls for a precise kinematic mount of the sensor plate, three spring contacts for the signals of the sensor, and solid metal springs for thermal and electrical ground contact
2: The precise Z motor with kinematically guided sapphire tube withdraws the scanner into the sensor exchanger cone.
3: The springs of Tyto-Claws are opened in the sensor exchanger cone.
4: The sensor plate can be placed into the cone with the wobble stick without risk of breaking the Tyto-Claw or the scan tube.
5: The z motor moves forward, the Tyto-Claw grabs the sensor plate which is then pressed onto the three ruby balls.
6: The sensor plate is now firmly mounted on the scan tube. The system is lightweight, non-magnetic, UHV, and low temperature compatible. It allows imaging the same atom after successive tip preparation steps.
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Position Sensors
Capacitive position sensors allow precise measurement
of the position of the coarse x-y piezo motors within a
few nanometers. This enables the retrieval of previously
imaged spots on a sample by simply recalling the stored
coordinates. This widens the scientific applicability of
SPM as it allows repetitive measurements to be made
on a larger set of spots on a sample.
Minimal Thermal Drift
The Tyto scan head is designed to deliver the lowest
rates of thermal drift. Materials with matching tempera-
ture expansion coefficients are used and the mechanical
path from tip to sample is thermally compensated. This
feature is important for achieving the highest stability
as well as the lowest drift.
Extremely Stable and Rigid
While every SPM is claims to be the most stable, in the
case of the Tyto scan head, every measure (derived from
extensive experience) has been applied to maximise its
mechanical stability and rigidity. The solid non-magnet-
ic titanium casing makes the tip-sample gap stiffer than
ever before.
Higher Voltages for Stiffer Piezos
The high voltage devices in Nanonis Control Systems are
able to operate at voltages up to ±400 V. This is a big ad-
vantage for the mechanical stability of the piezo scanner
since the wall of the piezo tube can be made thicker and
stronger while continuing to provide a large scan range.
Ultra Precise Piezo Motors
The Nanonis high voltage and high current Piezo Motor
Driver (PMD) allows the construction of more rigid pi-
ezo motors with a stronger driving force, and finer step
size. The innovative and truly kinematical sliding bear-
ing made from sapphire results in a strong holding force,
good repeatability and a longer lifetime. The net result
is finally a sharper image at the atomic level and a better
efficiency in coarse positioning.
High Performance Cabling
Up to 30 cables are linked to the advanced Tyto scan
head. All of them are copper coaxial cables for lowest
crosstalk. The copper shields also serve as thermal links
to ensure the whole head and all its components espe-
cially sample and sensor are in thermal equilibrium.
Four Evaporation Ports
Four openings in the body
of the Tyto scan head al-
low for in-situ evaporation
onto the sample at an angle
of 30 degrees from the sam-
ple normal.
Laser Ports
For simultaneous optical ex-
periments, the Tyto scan head
has two specular ports at an
angle of 36 degrees from the
sample normal with the pos-
sibility to mount extensions
such as lenses or mirrors.
Once the laser is adjusted to
the tip, the sample can be
moved with the x-y motor
to access different locations
without the need to re-ad-
just the laser.
Visual Inspection From All Sides
A large front opening and
windows situated on each
side of the body and at the
back allow for broad visual
inspection of the sample
and sensor in-situ under an
angle of 70 to 80 degrees
from the sample normal.
Electronic Contacts to the Sample
Various sample receptors can be installed in the Tyto
scan head, with four or twelve electronic contacts to
the sample. Optional extra features include a calibrated
Cernox temperature sensor located directly under the
sample plate, and a small heater to control the sample
temperature to within 1 mK.
Innovation in Surface Spectroscopy and Microscopy Systems 3
SPECS Tyto Scan Head Specifications
Body Material Titanium (non magnetic)
Total Weight ~300 g
Diameter 50 mm
Operating Temperature 0.5 K – 400 K
Bake out Temperature 120 °C
UHV compatibility < 1 x 10-10 mbar
Scanner
Scanner Tube with five electrodes
Maximum Voltage ± 400 V
XY Scan Range 300K/4K ~22 µm/~4 µm
Z Scan Range 300K/4K ~2.3 µm/~0.42 µm
Coarse Positioning Piezo Motors
Sliding contact bearing Kinematic Sapphire-Sapphire contacts
Operating voltage ± 400 V
Maximum peak current 20 A
XY Motor
XY Coarse Positioning (Sample)
Orthogonal guided Inertial shear piezo motors
Travel Range ± 2.5 mm
Final position switches Four opening contacts
Z Motor
Z Coarse Positioning (Sensor)
Inertial piezo motor with concentric piezo tube
Travel Range 20 mm
XY Encoder (Optional)
Encoder Type Differential Capacitive Sensor
Sensor Resolution 5 nm
Repeatability 100 nm
JT-Tyto-Kolibri-Nanonis
The Tyto scan head fits perfectly into the JT-SPM plat-
form, a Joule Thomson cryostat with temperatures down
to 1K and magnetic fields up to 3 Tesla. It runs best with
the KolibriSensor and the Nanonis Control System. A su-
perior combination in every respect.
Ease of Maintenance
Due to the modular design, exchanging functional parts
of the Tyto scan head is straightforward whenever a dif-
ferent experimental configuration is required or a part
needs to be replaced. Standard parts for the scan head
are premanufactured and are readily available off the
shelf from SPECS. The up-time of the scan head can thus
be maximised and scientific output increased.
Highest Performance STM and ncAFM
The new and advanced features of the Tyto scan head
do not compromise traditional STM or NC-AFM perform-
ance. Rather, our long-standing experience with SPM
technology has resulted in a precision scan head with
the highest stability and best signal quality, which will
produce STM and ncAFM images of a quality never seen
before.
Tyto Starter Kit
In order to speed up the starting process, SPECS offers
the air station for mounting the Tyto scan head. With a
spring suspension and the standard SPECS SPM connec-
tor, it allows operation of the scan head in air in order to
gain experience. The Tyto head can be mounted subse-
quently in one of the SPECS SPM platforms, such as the
JT-SPM, for example.
SPECS Surface Nano Analysis GmbHVoltastrasse 513355 BerlinGermany
Tel. +49 30 46 78 24-0Fax +49 30 46 42 08-3Email [email protected] www.specs.com ISO 9001 Certificate
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Technical alterations reserved. The information in this document is provided with greatest care but SPECS does not assume any liability arising from the application or use of the information or product described here. SPECS is a registered trademarks of SPECS GmbH.
Other product and company names mentioned herein are trademarks or trade names of their respective companies.Printed in September 2010
Innovation in Surface Spectroscopy and Microscopy Systems