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attoSHPM
low temperature scanning Hall probe microscope
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The attoSHPM is a compact scanning Hall probe microscope,
designed particularly for operation at low temperature and
high magnetic fields. At the heart of the SHPM, a molecular
beam epitaxy (MBE) grown GaAs/AlGaAs Hall sensor measures
magnetic fields with unrivalled sensitivity. Local measurements
of the magnetization of a sample are obtained by scanning the
sample underneath the Hall sensor and simultaneously recording
the Hall voltage, directly yielding the local magnetic field.
While other local probes may outperform the Hall sensor with
respect to its lateral resolution, its ability to non-invasively
obtain quantitative values for the local magnetic field makes
the Hall sensor a unique tool for the study of superconductors
and magnetic materials.
Principle - The microscope uses a set of xyz-positioners for
coarse positioning of the sample over a range of several mm.
The scanning motion of the sample is provided by an attocube
piezo scanner, yielding
a scan range of up to
30 x 30 μm² at 4.2 K. The
adjustment of the Hall sensor
is performed outside of the
cryostat prior to cooling the
microscope. The exceptional
combination of materials
allows absolutely stable
high resolution imaging of
surfaces and local magnetic
fields.
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01 LT and HV compatible feedthroughs
02
vacuum window
03 microscope insert
04 superconducting magnet (optional)
05 liquid He dewar (optional)
06 sample
07 xyz scanner
08 xyz coarse positioners
09 ultra stable Titanium housing
10 Hall probe sensor head |
Scheme of a cryogenic SHPM insert including cryostat and superconducting magnet.
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Request Quotation & Support : |
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Available
Controller for this Product:
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FPGA-based, fully digital SPM controller
with xy-scan generator incl. feedback control und phase locked loop (PLL)
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| ANC350 |
Piezo positioning controller
for attocube's encoded positioners| |
| ANC300 |
Piezo positioning controller
for attocube's open-loop positioners | |
Complete
System Solutions:
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Complete system
configurations for this product. |
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Key Features
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ultra
compact SHPM head |
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low temperature quantitative & non-invasive magnetic
measurements down to the mK range |
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STM tracking distance detection |
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min. detectable field: ~ 10 μT @ 4 K |
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ultra-high resolution |
| Benefits
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fits
standard cryogenic and magnet sample spaces |
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highest measurement
sensitivity |
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compatible with high magnetic fields (15 T+) |
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large cryogenic scan range available (30 x 30 μm2 @ 4 K) |
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easily exchangable SPM heads |
SHPM image of BaFeO, recorded at 4.2 K in constant height mode.
The color scale spans 106 mT (black to yellow), while the field
detection limit of this measurement is 20 μT. |
| Close-up of the MBE grown SHPM chip, showing its Hall-sensor/STM leads and the bond wires for electrical connection to the
chip carrier. The Hall sensors are available as high resolution and
ultra-high resolution versions, featuring an active Hall area of
400 nm and 250 nm, respectively. |
attoSHPM microscope head,
showing the Hall chip & carrier. |
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