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 | magnetometer based on Nitrogen-Vacancy (NV) Centers in Diamond, combining confocal (CFM) and atomic force microscope (AFM) with microwave excitation |
| NV tips | QZabre QST: fully integrated sensor chip with a single NV at the tip, AFM-compatible force feedback and integrated microwave antenna |
| Modes of Operation | |
| imaging modes | NV-based: ODMR, quench mode, iso-B mode, pulsed protocols. Others: AFM (engaged in shear mode and fixed height), CFM, MOKE, widefield (non-scanning) |
| slope compensation | 2 axis scan plane correction |
| pulsed protocols | Rabi, Ramsey, Spin-Echo, CPMG, XY4, XY8, customizable pulsed protocols |
| NVM performance | |
| ODMR contrast at base temperature | > 8 % |
| magnetic field sensitivity | < 10 µT/(Hz)^1/2 |
| lateral magnetic resolution | < 70 nm |
| microwave generator | 0.7 – 6 GHz |
| single photon detector | high quantum efficiency (typically 80% at 670 nm, guaranteed > 60%) |
| AFM performance | |
| z feedback | AM-AFM (amplitude modulation), FM-AFM (frequency modulation); using PID feedback loops and PLL |
| RMS z-noise (BW = 200 Hz) | < 0.4 nm @ RT, < 2.5 nm @ LT |
| z bit resolution @ 4 K | 25 pm at 2 µm range |
| Confocal Unit | |
| configuration | compact and modular design, two optical channels: one excitation and one detection channel |
| key benefits | motorized steering mirror for combined beams, long-term stability: drift of < 100 nm/24h (within deltaT=2K in lab) |
| confocal excitation | 515 nm (others on request) |
| compatible LT-objective | LT-APO/Raman532 |
| inspection unit | sample/tip imaging with large field of view: ~55 µm |
| Sample Positioning | |
| total travel range | 2 mm x 3 mm x 2.5 mm (closed loop via resistive encoder), 3 degrees of freedom each for tip and sample |
| 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 |
| Suitable Operating Conditions | |
| temperature range | < 1.8 .. 300 K in quench mode (AFM scan with optical readout, MW off), < 4 .. 300 K in cw-ODMR |
| magnetic field range | 9/1/1 or 1/1/1 Tesla |
| atmosphere | designed for He exchange gas |
| Suitable Cooling Systems | |
| bore size requirement | designed for top-loading cryostat with 2" (50.8 mm) opening (Ti housing diameter of mic = 48 mm) |
| compatible cryostats | attoDRY2200 |
| Options and Upgrades | |
| MOKE | polar MOKE in H/V basis with a biased photodetector (BW=500 kHz), remotely controllable waveplate, integration into QS3 software |
| RF sample holder | 2 additional RF cables for the sample |
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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Merons, Antimerons and Bimerons
synthetic antiferromagnet
Merons, Antimerons and Bimerons
Meronic spin textures in synthetic antiferromagnet multilayer acquired by cw-ODMR at T=290 K, with the tip sample distance of 75 nm. Black and white circles represent merons and antimerons, respectively. Two adjacent white and black circles are identified as bimerons, highlighted by ellipses. The scan has pixel-pixel distance of 50 nm. Sample courtesy of Prof. Mathias Kläui (JGU, Germany)
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