A5053438079- Diamond and Carbon-based Materials Research
- Semiconductor materials and devices
- Metal and Thin Film Mechanics
- Atomic and Subatomic Physics Research
- High-pressure geophysics and materials
- Force Microscopy Techniques and Applications
- Electronic and Structural Properties of Oxides
- Magnetic Field Sensors Techniques
- Physics of Superconductivity and Magnetism
- Analytical Chemistry and Sensors
- Silicon and Solar Cell Technologies
- Semiconductor materials and interfaces
- Magnetic properties of thin films
- Sensor Technology and Measurement Systems
- Geophysics and Sensor Technology
- Advanced Surface Polishing Techniques
Tokyo Institute of Technology
2017-2023
This study demonstrates imaging of the magnetic response to external pressure using a hybrid structure magnetostrictive (MS) layers and nitrogen-vacancy ($\mathrm{N}$-V) centers in diamonds. The MS layer facilitates pressure-to-magnetic field conversion, detected by $\mathrm{N}$-V centers. We use materials comprising in-plane magnetized ${\mathrm{Sm}\mathrm{Fe}}_{2}$ as diamond with perfectly aligned vertical [111] orientation effectively detect conversion. coefficient, defined change...
Various techniques have been applied to visualize superconducting vortices, providing clues their electromagnetic response. Here, we present a wide-field, quantitative imaging of the stray field vortices in thin film using perfectly aligned diamond quantum sensors. Our analysis, which mitigates influence sensor inhomogeneities, visualizes magnetic flux single YBa2Cu3O7−δ with an accuracy ±10%. The obtained vortex shape is consistent theoretical model, and penetration depth its temperature...
Nitrogen-vacancy (NV) centers in diamonds are expected for high-performance quantum sensing devices. The NV heteroepitaxial diamond films on Si substrates have more potential to enable low-cost and large-area sensors than typical single-crystal support the emergence of diamond/Si hybrid In this paper, were formed (111) with preferential atomic alignment [111] direction. addition, incorporation silicon-vacancy centers, which decrease sensitivity sensors, from 3C-SiC/Si substrate was...
We demonstrate a photoelectrical readout of negatively charged nitrogen-vacancy (NV−) centers by utilizing lateral diamond p–i–n diode structure. found that the photocarriers generated at NV are efficiently extracted in depletion layer even zero voltage. The transport mechanism for photoexcited minority carriers was investigated varying nitrogen ion implantation dose. carrier diffusion length decreased when passed through region, particularly high From photoelectrically detected magnetic...
Abstract Extending the spin‐dephasing time ( T 2 * ) of perfectly aligned nitrogen‐vacancy (NV) centers in large‐volume chemical vapor deposition (CVD) diamonds leads to enhanced DC magnetic sensitivity. However, NV is significantly reduced by stress distribution diamond film as its thickness increases. To overcome this issue, they developed a method mitigate CVD films, leading extension ensemble centers. films ≈60 µm with are formed on (111) substrates misorientation angles 2.0°, 3.7°,...
Abstract Thick CVD diamond film with perfectly aligned nitrogen-vacancy (NV) centers leads to highly sensitive quantum sensors. A misorientation angle ( θ mis ) of the (111) substrate is a key determine thickness. We investigated dependence growth rate and NV center properties on (0.4°–9.9°). The increased from 1.8 4.4 μ m h −1 yield (=[NV centers]/[Nitrogen]) 0.4% 1.1% by increasing . Finally, thickness ≈120 was obtained an area 300 × 400 using 9.9°.
Abstract The reduction of inhomogeneous stress in diamonds is crucially important for extracting excellent performance semiconducting diamonds. In this study, to investigate elastic deformation nitrogen doped (111) diamond films caused by stress, we evaluated the these using confocal Raman microscopy. was detectable when misorientation angle ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>θ</mml:mi> </mml:mrow> <mml:mi...
We present a wide-field imaging technique using perfectly-aligned diamond quantum sensors to accurately visualize superconducting vortices in thin film. Our results agree with theoretical models, validating our method’s precision and versatility characterizing superconductors.
Various techniques have been applied to visualize superconducting vortices, providing clues their electromagnetic response. Here, we present a wide-field, quantitative imaging of the stray field vortices in thin film using perfectly aligned diamond quantum sensors. Our analysis, which mitigates influence sensor inhomogeneities, visualizes magnetic flux single YBa$_2$Cu$_3$O$_{7-δ}$ with an accuracy $\pm10~\%$. The obtained vortex shape is consistent theoretical model, and penetration depth...
Extending the spin-dephasing time (T2*) of perfectly aligned nitrogen-vacancy (NV) centers in large-volume chemical vapor deposition (CVD) diamonds leads to enhanced DC magnetic sensitivity. However, T2* NV is significantly reduced by stress distribution diamond film as its thickness increases. To overcome this issue, we developed a method mitigate CVD films, leading extension ensemble centers. films approximately 50 \mu m with were formed on (111) substrates misorientation angles 2.0, 3.7,...
Abstract The magnetization process of a soft magnetic CoFeB-SiO 2 thin film was imaged using diamond quantum sensors with perfectly aligned nitrogen-vacancy centers along the [111] direction formed by CVD. Around edge, easy and hard axes directions exhibited different responses to external field, consistent ones observed magneto-optical Kerr effect microscopy. Moreover, imaging could observe discontinuous domain walls as non-uniform charges (MCs). Quantum would help in visualization through...