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attoSHPM
low temperature scanning Hall probe microscope
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 attoSHPM+, 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 stray 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. The attoSHPM+ features an interferometric
encoder for closed loop operation with 1 nm resolution, and an
ultra large range scanner with 125 µm scan range at 4 K.
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01 vacuum window
02 LT and HV compatible feedthroughs
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03 microscope insert
04 superconducting magnet (optional)
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05 attoDRY1100 cryostat (optional)
06 attoFPSensor based closed loop sensors
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07 SHPM sensor (250 nm or 400 nm)
08 quick exchange sample holder with 8 electrical contacts
09 ultra-large range xyz scanner 125 μm x 125 μm x 15 μm @ 4 K
Schematic drawing of the low temperature attoSHPM
and the attoDRY1100 cryostat (optional)
10 xyz coarse positioners 5 mm x 5 mm x 5 mm
11 ultra stable titanium housing