Microscopic observation of magnetic materials helps to study the microstructure and formation mechanism of materials. With the development of scientific research, the scale of magnetic material research has tended to be at the sub micron or even nanometer level. Therefore, testing with ultra-high resolution and ultra-high sensitivity helps to study materials of these sizes.
The QSM system, developed by combining years of magnetic measurement technology for NV color centers with scanning imaging technology, can achieve high sensitivity and resolution magnetic imaging, and quantitative magnetic analysis, making it the next generation of scanning probe microscopes - super-resolution quantum magnetic microscopes based on NV color centers. Compared to traditional microscopic observation devices such as Kerr microscope (resolution~300 nm) and magnetic force microscope (resolution~50 nm), this device not only has a magnetic resolution better than 30 nm, but also can quantitatively test the surface magnetic field size of the sample. Moreover, as a single spin probe, the NV color center generates a magnetic field that does not disturb the test sample, which has significant advantages in magnetic microscopy imaging.
QSM Super Resolution Quantum Magnetic Microscope - Typical Applications
√ Analysis of magnetic nanostructures
√ Ferromagnetic/antiferromagnetic domain imaging
√ Analysis of magnetic domain walls
√ Current distribution imaging
Temperature measurement at the nanoscale
√ Multi iron material scanning
√ Time resolution of any waveform of magnetic field
QSM Super Resolution Quantum Magnetic Microscope - Introduction to Scanning Imaging Principles
The NV color center of diamond is a defect formed by a nitrogen atom replacing a carbon atom with a nearby vacancy in the diamond. Its electronic energy level is a spin triplet state, and its ground state ms=0 and ms=± 1 (degenerate state) exhibit zero field splitting at 2.87 GHz. Under the action of an external magnetic field B, ms=± 1 dissociates from the degenerate state and undergoes splitting. The spin state of the NV color center can be operated and detected by laser and microwave, usually using optical detection magnetic resonance (ODMR) to measure the external magnetic field. At this time, the NV color center is under the action of microwave, and resonance occurs when the microwave energy is exactly equal to the energy level difference between the ms=± 1 ground state electron and the ms=0 ground state electron. At this time, fluorescence detection shows a low valley. The energy level difference between the ground states of Ms=+1 and Ms=-1 is Δ f=2 γ B. △ f can be obtained from the two resonance peaks of the ODMR spectrum, γ The electron spin magnetic ratio of the NV color center, γ= 28 MHz/mT, this can calculate the magnitude of the external magnetic field B. By continuously detecting the magnetic field on the surface of the sample through a scanning probe, an imaging map of the magnetic field distribution on the sample surface can be obtained.
Schematic diagram of scanning imaging principle of super-resolution quantum magnetic microscope based on NV color center
QSM Super Resolution Quantum Magnetic Microscope - Main Features
√ Ultra high magnetic resolution and sensitivity
√ Quantitatively measure the size and spatial distribution of the surface magnetic field of the sample
√ Optimized optical systems achieve greater light transmittance
√ Multiple imaging modes
√ Turnkey system
√ Easy to replace probe design
√ Vector magnetic field option
QSM Super Resolution Quantum Magnetic Microscope - Technical Parameters
√ Operation modes: NV mode, NV queuing mode, AFM mode, MOKE mode;
√ NV mode: magnetic field spatial resolution: 30nm~70nm,
Magnetic field sensitivity: 1-10 μ T/Hz ^ (1/2), (depending on probe selection);
√ AFM mode: Use Qzabre probe resolution~250nm, use Akiyama probe resolution<30nm;
√ MOKE mode: Use polar Kerr microscopy mode to quickly obtain the region of interest, with a field of view of 150 μ M;
√ Scanning range: 90 μ M x 90 μ M x 15 μ M (closed-loop control, 0.15nm resolution)~ 6mm coarse tuning (100nm resolution);
√ Sample size can be placed: 25mm diameter (standard type), up to 50mm x 50mm (customized);
√ Drift rate: 6nm/h, 0.3 ℃ temperature stability;
√ Optimized optical system: NA=0.75, with a light transmittance of>87% (600-850nm), which increases the light transmittance by>10% compared to traditional confocal systems;
The vector electromagnet option provides a vector field height of 75 mT in any direction;
Customized sample holder with extended DC or microwave connection, heating function, etc.
