attoNVM
cryogenic NV microscope
unmatched magnetic field sensitivity & photon count rate
breakthrough in magnetic imaging & fully quantitative
ultra-low vibrations and drift tuned for quantum applications
ultimate stability over long measurement cycles
swiftly and safely exchangeable NV tips with integrated MW antenna
advanced user-friendliness for advanced scanning microscopy
The ability to measure magnetic fields at nanoscale in cryogenic environment is key for understanding magnetism on the quantum level and for designing materials for novel data storage devices or quantum computers. Nitrogen vacancy magnetometry (NVM) is a quantum sensing technique particularly suitable for applications where high magnetic field sensitivity is required.
attocube and QZabre combine forces to bring to the market the first commercial cryogenic scanning NV magnetometer in a dry cryostat. The seamless integration between attocube and QZabre state-of-the-art hardware and software enables users to efficiently perform magnetic imaging at various temperatures and truly quantitatively. There is no need for the calibration of the sensor, because of using its quantum properties for imaging.
Specifications
| General Specifications | |
|---|---|
| type of instrument | combined confocal (CFM) and atomic force microscope (AFM) with microwave excitation for scanning optically detected magnetic resonance (ODMR) |
| scanning protocols | NV scanning mode (cw-ODMR), quench mode, iso-B mode, AFM in contact and fixed height |
| pulsed protocols | Rabi, Ramsey, Spin-Echo, CPMG, XY4, XY8 |
| Modes of Operation | |
| imaging modes | optically detected magnetic resonance (ODMR), AFM, CFM, widefield, MOKE |
| slope compensation | 2 axis scan plane correction |
| z feedback | AFM: PI feedback loop for amplitude setpoint (AM) or frequency modulation (FM) using included PLL |
| RMS z-noise (BW = 200 Hz) | < 0.4 nm @ RT, < 2.5 nm @ LT |
| Resolution | |
| z bit resolution @ 4 K | 25 pm at 2.4 µm scan range |
| Confocal Unit | |
| configuration | compact and modular design, two optical channels: one excitation and one detection channel |
| key benefits | motorised steering mirror for combined beams. long-term stability: drift of < 100 nm//24h within deltaT=2K |
| compatible LT-objective | LT-APO/Raman532 |
| inspection unit | sample imaging with large field of view: ~55 µm |
| Illumination | |
| excitation wavelength range | default 515 nm (others on request) |
| Detection | |
| detection mode | e.g. optically detected magnetic resonance (ODMR), fluorescence |
| ODMR contrast at base temperature | > 8 % |
| Sample Positioning | |
| total travel range | independent degrees of freedom for tip and sample of 2 mm x 3 mm x 2.5 mm (closed loop) |
| fine scan range | 30 x 30 x 4.3 µm³ @ 300 K, 18 x 18 x 2 µm³ @ 4 K (open loop) |
| sample holder | Ti plate with integrated heater and calibrated temperature sensor |
| step size | 0.05 .. 3 µm @ 300 K, 10 .. 500 nm @ 4 K |
| Options and Upgrades | |
| closed loop upgrade for coarse positioners | resistive encoder, range 3 mm, sensor resolution approx. 200 nm, repeatability 10 µm |
| Suitable Operating Conditions | |
| magnetic field range | 9/1/1 or 1/1/1 Tesla |
| operating pressure | designed for He exchange gas |
| temperature range | < 1.8 .. 300 K in quench mode (AFM scan with optical readout, MW off), < 4 .. 300 K in cw-ODMR |
| Suitable Cooling Systems | |
| titanium housing diameter | 48 mm |
| bore size requirement | designed for a 2" (50.8 mm) cryostat/magnet bore |
| compatible cryostats | attoDRY2200 |
Selected Measurements
Magnetic Domains
metalic multilayer Ir/Fe/Co/Pt
Magnetic Domains
Magnetic field map of a Ir/Fe/Co/Pt multilayer sample acquired by CW-ODMRM at T=2.9 K, with the tip sample distance of 50 nm. The pixel-pixel distance is 20 nm. No post-processing was performed. Sample courtesy of Prof. Anjan Soumyanarayanan (A*STAR, Singapore).
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Abrikosov vortices
BSCCO
Abrikosov vortices
Magnetic vortices in BSCCO-2212 sample acquired by cw-ODMR at T=71 K, measured in tip-sample contact. The sample was field-cooled at Bz=3.7 mT and measured in bias field of B=7 mT projected along the NV axis. The scan has pixel-pixel distance of 66 nm. Measurement time was 2h and 40min. The scan shows 26 vortices, which is in good agreement with the expected value of 28.6 vortices.
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van der Waals Magnet
twisted double bilayer CrSBr
van der Waals Magnet
Image of magnetic domains in twisted double bilayer CrSBr acquired by cw-ODMR at T=70 K, with the tip sample distance of 100 nm. The scan with resolution of 75 x 100 pixels took 6h. Sample courtesy of Prof. Alexander Högele (LMU, Munich).
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Abrikosov vortices
YBCO
Abrikosov vortices
Magnetic vortices in YBCO thin film acquired by cw-ODMR at T=3 K, measured in tip-sample contact. The sample was field-cooled at Bz=1.18 mT and measured in bias field of B=1.84 mT projected along the NV axis. The scan has pixel-pixel distance of 66 nm. Measurement time was 4h. The scan shows 9 vortices, which is in good agreement with the expected value of 9.14 vortices.
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Magnetic Domains
metalic multilayer Ir/Fe/Co/Pt
Magnetic Domains
Magnetic field map of a Ir/Fe/Co/Pt multilayer sample acquired by cw-ODMR at T=3 K, with the tip sample distance of 30 nm. Measurement done by the group of Prof. Cristian Bonato (Heriot-Watt University, UK).
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Antiferromagnetic Domain Walls
CrSBr
Antiferromagnetic Domain Walls
Image of domain walls in an antiferromagnetic sample CrSBr acquired by CW-ODMR at T=115 K, with the tip sample distance of 70 nm. Measurement done by the group of Prof. Cristian Bonato (Heriot-Watt University, UK).
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