A5100437993- Magnetic properties of thin films
- Quantum and electron transport phenomena
- Digital Holography and Microscopy
- Image Processing Techniques and Applications
- Physics of Superconductivity and Magnetism
- Force Microscopy Techniques and Applications
- Advanced X-ray Imaging Techniques
- Spectroscopy and Quantum Chemical Studies
- Photochemistry and Electron Transfer Studies
- Advanced Vision and Imaging
- Advanced MEMS and NEMS Technologies
- Photonic Crystals and Applications
- Magnetic and transport properties of perovskites and related materials
- Nanocluster Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Advanced Memory and Neural Computing
- Advanced Image Processing Techniques
- Crystallography and Radiation Phenomena
- Mechanical and Optical Resonators
- X-ray Spectroscopy and Fluorescence Analysis
- Laser-Matter Interactions and Applications
- Theoretical and Computational Physics
- Nuclear Physics and Applications
- Magneto-Optical Properties and Applications
- Micro and Nano Robotics
University of Otago
2024
MacDiarmid Institute for Advanced Materials and Nanotechnology
2015-2024
Victoria University of Wellington
2015-2024
Guangdong University of Technology
2021-2024
National Institute of Metrology
2023-2024
Wuhan Ship Development & Design Institute
2023
South China Normal University
2023
Institute of Semiconductors
2023
Xidian University
2023
Helmholtz-Zentrum Berlin für Materialien und Energie
2022
We report a large enhancement of thermally injected spin current in normal metal (NM)/antiferromagnet (AF)/yttrium iron garnet (YIG), where thin AF insulating layer NiO or CoO can enhance the from YIG to NM by up factor 10. The NM/AF/YIG, with pronounced maximum near Néel temperature layer, has been found scale linearly spin-mixing conductance at NM/YIG interface for NM=3d, 4d, and 5d metals. Calculations mixing are qualitatively consistent experimental results.
Self-consistent determination of the key parameters in spin-charge conversion via spin pumping–induced inverse Hall effect.
Spin pumping and related phenomena have been observed recently in heavy metals topological insulators, where the spin-orbit coupling plays an essential role. We developed a spin-pumping formalism that explicitly includes at interfaces disorder layers. across interface with attendant backflow are treated on equal footing. resolve some long-standing issues conflicting conclusions about spin-diffusion length for Pt, origin of spin-memory loss metals. In addition, we predict heretofore...
With the continuous miniaturization and integration of semiconductor industry, micro/nanoscale integrated photonics has received extensive attention as a key technology for optical communication, storage, interconnection. Here, two-in-one device is reported with both unidirectional blue light emission UV photodetection functions based on single trapezoidal PIN GaN microwire. By constructing Fabry-Perot resonator cavity structure, end-emitting light-emitting diode low turn-on voltage (≈0.97...
We theoretically study magnon transport in an insulating spin valve (ISV) made of antiferromagnetic insulator sandwiched between two ferromagnetic (FI) layers. In the conventional metal-based valve, electron spins propagate metallic layers, giving rise to giant magnetoresistance and transfer torque. Here, incoherent magnons ISV serve as angular momentum carriers are responsible for FI layers across spacer. predict phenomena presence temperature gradient: a magneto-spin-Seebeck effect which...
Spin pumping in a ferromagnetic (FM) and nonmagnetic (NM) metallic bilayer generates an electric voltage whose origins have been attributed to the inverse spin Hall effect (ISHE) NM layer. We show that or current from is not limited ISHE of layer; instead, there are two other previously unidentified contributions: one interface FM By using our newly developed formalism, we compute relative contributions these three sources induced voltages. When apply results NiFe/Pt bilayer, find...
Multichromophore perylene arrays were designed and synthesized to have extremely efficient resonance energy transfer. Using broadband ultrafast photoluminescence transient absorption spectroscopies, transfer timescales of approximately 1 picosecond resolved, corresponding efficiencies up 99.98%. The measurements also revealed spectra incoherent between localized states. Polarization resolved spectroscopy was used measure the dipolar angles donor acceptor chromophores, thereby enabling...
The advent of X-ray free-electron lasers (XFELs) has revolutionized fundamental science, from atomic to condensed matter physics, chemistry biology, giving researchers access X-rays with unprecedented brightness, coherence and pulse duration. All XFEL facilities built until recently provided pulses at a relatively low repetition rate, limited data statistics. Here, results the first megahertz-repetition-rate scattering experiments Spectroscopy Coherent Scattering (SCS) instrument European...
We theoretically study the structural, electronic, and optical properties of lithium niobate under pressure using plane-wave pseudopotential density functional theory by CASTEP code. It was found that there is a phase transition from R3c structure to Pnma at 18.7 GPa. The dynamically stable according calculation phonon dispersion. From charge distributions, exist covalent interactions along Nb–O bond. hybridization between O 2p Nb 4d orbital in increases with increasing pressure, while it...
This Letter presents a non-local means filter based on the Pearson correlation coefficient and Butterworth high-pass filter. In method, new gray value of denoising pixel is equal to weighted sum surrounding values. We use between pixels calculate weight pixel, then optimize. Experimental results show that method effectively reduces speckle noise digital holography image details are also very rich. At same time, its performance still better when compared with methods such as BM3D.
3D non-equilibrium molecular dynamics simulations are performed to investigate the friction heat dissipation and generation of high-speed sliding system. A simulation model with two blocks is built. The different materials, velocities studied. mechanism at interface investigated. partition system obtained. results show that more will be produced higher velocity. But in case plastic deformation, less generated. mainly influenced by material velocity ratio. which has similar thermodynamic...
The conventional spin-diffusion equation, based on the presence of spin-split local chemical potentials, has successfully described spin accumulation attendant to diffusive transport in spintronics. A recent experiment shows that far exceeds limit set by such spin-diffusive theory when mean free path is longer than dephasing length. By introducing momentum and dependent potential, we develop a generalized equation capable addressing systems where ballistic processes are embedded overall...
The tapping-mode atomic force microscope (TM-AFM) is widely used today; however, improper matching between the operating medium and sampling time may lead to inaccurate measurement results. relationship damping coefficient steady state of TM-AFM microcantilever investigated in this paper using multiple stability theory. Firstly, effects changes dimensionless linear coefficients piezoelectric film on motion system are examined bifurcation diagrams, phase trajectories, domains attraction....
The application of digital holography in several fields is limited since speckle destroys the original information reconstructed image. This paper proposes a neighborhood filter based on multiple sub-reconstructed images according to random distribution noise. In this method, denoised value equal weighted sum neighboring pixel values, and weight calculated by degree correlation between different positions sub-holograms. experimental results show that method can greatly reduce noise, its...
We formulate the law of conversion between spin current and charge in several classes materials including ferromagnetic, paramagnetic spin-orbit coupled systems. find that interpretation is highly non-trivial, we have identified pure composite currents. For an interfacial Rashba Hamiltonian, show transport much closer to ferromagnets than non-magnetic materials. In particular, in-plane layered structures will generate a flowing perpendicular interface, vice versa. Application spin-charge...
The Ka-band 100W radiation-cooled space TWT has been developed in Nanjing Sanle Group Co. LTD, which the bandwidth 2GHz, output power more than 103W, overall-efficiency 63% and weight less 950g. It's dimension is 344mm*135mm*135mm. passed qualification reliability tests, its proved by test results. development process of are introduced briefly this paper.
Alterations in the dynamical properties of an atomic force microscope microcantilever beam system tapping mode can appreciably impact its measurement precision. Understanding influence mechanism dynamic parameter changes on system’s motion characteristics is vital to improve accuracy (AFM-TM). In this study, we categorize mathematical model AFM-TM into systems 1 and 2 based actual working conditions. Then, analyze alterations both due external excitation variations using bifurcation...
Colloidal quantum dots (QDs) are heavily investigated for their applications in light emission such as emitting diodes and, more challenging, lasers. This is due to appealing processing conditions, compared e.g. epitaxy, resulting lowering cost. They can also be patterned and optical properties tuned. Using confined Cd-based QDs, several groups have shown amplification ensuing lasing action the red part of spectrum. Although impressive milestones were achieved, there date no single material...