A5101900668- Magnetic properties of thin films
- Magnetic Properties and Applications
- Magneto-Optical Properties and Applications
- Rocket and propulsion systems research
- ZnO doping and properties
- Fluid Dynamics and Heat Transfer
- Heusler alloys: electronic and magnetic properties
- Energetic Materials and Combustion
- Multiferroics and related materials
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Advanced Memory and Neural Computing
- 2D Materials and Applications
- Characterization and Applications of Magnetic Nanoparticles
- Particle Dynamics in Fluid Flows
- Magnetic Properties of Alloys
- Topological Materials and Phenomena
- Combustion and Detonation Processes
- Electromagnetic Launch and Propulsion Technology
- Theoretical and Computational Physics
- Quantum and electron transport phenomena
- Gyrotron and Vacuum Electronics Research
- Terahertz technology and applications
- Geomagnetism and Paleomagnetism Studies
- Heat transfer and supercritical fluids
Fudan University
2019-2023
China Aerospace Science and Industry Corporation (China)
2022
Yunnan University
2019
Northwestern Polytechnical University
2014-2017
Abstract Spintronic heterostructures consisting of ferromagnetic (FM) and nonmagnetic (NM) have become increasingly important devices for terahertz (THz) pulse generation, named as spintronic THz emitter (STE). The recycling the laser pump energy is known to a key impact on further improvement emission. Here, an efficient practical approach enhance manipulate generation based cascaded Pt/CoFe/Ta trilayer fabricated flexible polyethylene terephthalate (PET) substrate shown. Considering...
Spintronic materials with two-dimensional (2D) transition-metal dichalcogenide (TMD)/ferromagnet (FM) interfaces have received a great deal of interest recently due to strong modulation the magnetic properties, which provide attractive opportunities for information storage. Here, we demonstrate spin-orbit coupling (SOC) effect and interfacial tuning magnetization dynamics in $M{X}_{2}$/$\mathrm{Co}\text{\ensuremath{-}}\mathrm{Fe}\text{\ensuremath{-}}\mathrm{B}$ thin films by means...
Rapid manipulation of magnetization orientation by a femtosecond pulse laser is an efficient way for advanced information storage technology. We report comprehensive study the interlayer coupling effect on dynamics in [Ni/Co]4/Ru(tRu)/[Co/Ni]3 perpendicular magnetic films time-resolved magneto-optical Kerr approach. By controlling antiferromagnetic (AF) field Hex and external H, we demonstrate distinctly different dynamic behaviors upon excitation. First, three kinds demagnetization process,...
Understanding of ultrafast spin dynamics is crucial for future and energy efficient magnetic memory storage applications. We study the laser-induced magneto-optical response a CoFeB/MgO/CoFeB tunneling junction (MTJ), when exciting with short laser pulse, as function configuration pump fluence. The magnetization MTJ drops rapidly in timescale 0.33–0.37 ps, which driven by both electron-spin scattering transport mutually. Subsequently, from electron reservoirs transfers into lattice 1.5–2.0...
The recent advances of high spin-orbit torque efficiency in ferromagnetic/topological insulator (TI) structures hold great promise for the development high-performance spintronic devices. However, roles spin-momentum-locked Dirac surface states (SSs) and interfacial magnetic proximity effect (MPE) on dynamic properties are still under debate. Here, we quantitatively distinguish manipulation effects SSs MPE damping anisotropy TI/nonmagnet/CoFe heterostructures. We found that, addition to...
The magnetization precession dynamics is systematically studied in L10-FePt/NM/[CoNi]5 exchange-coupled films using the time-resolved magneto-optical Kerr effect technique, where nonmagnetic interlayer Ta or Pt. It demonstrated that frequency f decreases dramatically with increasing thickness of (tTa) Pt (tPt). By fitting ∼ H curves different tTa coherent model including interfacial coupling interaction, exchange strength as well orientations FePt and [CoNi]5 are determined. Meanwhile, it...
We report a comprehensive study of annealing treatment modulation on the laser-induced ultrafast magnetic behaviors in antiferromagnetically exchange-coupled [Ni/Co]4/Ru/[Co/Ni]3 multilayers with perpendicular anisotropy (PMA). Magnetic hysteresis loops indicate that uniaxial PMA field Hkeff decreases monotonously increase temperature Ta, but variation interlayer coupling Hex is rather complicated. Time-resolved magnetic-optical Kerr effect (MOKE) measurements demonstrate laser-excited...
The modulation of antiferromagnetic (AFM) material and thermal annealing treatment on the magnetic damping various AFM/CoFeB (CFB) samples have been systematically studied with time-resolved magneto-optical Kerr effect. It is found saturated factor αs increases considerably after introducing a thin MnIr or MnPt AFM layer. As Al spacer tAl = 0–2 nm inserted, to decrease rapidly, reaching nearly same value as that single CFB film at 2 nm. result suggests layer not good spin sink surprisingly...
High frequency magnetic precessions with strong intensity are strongly desired in material systems for high performance memory or nano-oscillator applications ultrafast manipulation speed. Here, we demonstrate an exchange-coupled asymmetric composite film structure of Ta/Pd/[Pd/Co]5/Cu(tCu)/[Co/Ni]5/Ta adjustable perpendicular anisotropy and interlayer coupling strength, which the dynamic properties systematically studied by using time-resolved magneto-optical Kerr effect spectroscopy. It is...
Magnetic multilayers with perpendicular magnetic anisotropy (PMA) have significant advantages in the development of spintronic applications. However, currently, research on temperature (T) dependence magnetization dynamics is mainly focused in-plane magnetized ferromagnetic materials. In this work, properties effective PMA field Hkeff and intrinsic damping factor α0 were investigated at various T for nanoscale Cu(tCu)/[Co/Ni]N by time-resolved magneto-optical Kerr effect approach. It quite...
Static and dynamic magnetic properties of $\mathrm{Co}$-$\mathrm{Fe}$(10 nm)/$\mathrm{Ru}$$({t}_{\mathrm{Ru}}=0\ensuremath{-}3\phantom{\rule{0.25em}{0ex}}\mathrm{nm})$/$\mathrm{Co}$-$\mathrm{Fe}$(5 nm) asymmetric trilayers are systematically investigated. The interlayer exchange coupling (IEC) strengths bilinear $({J}_{1})$, biquadratic $({J}_{2})$, their equivalent $({J}_{\mathrm{eff}})$ terms determined; they show a weak nonmonotonic behavior with ${t}_{\mathrm{Ru}}$. Interestingly, the...
In conventional spintronic devices, ferromagnetic materials are used, which have a magnetization dynamics timescale of around nanoseconds, setting limit for the switching speed. Increasing speed has been one major challenges research. this work we take advantage ultrafast magnetic in ferrimagnetic instead ferromagnets, and use femtosecond laser pulses plasmonic photoconductive switch to create THz electrical by spin-orbit torque. By anomalous Hall magneto-optic Kerr effect (MOKE)...
The temperature (T) dependences of magnetization dynamics, especially for magnetic damping anisotropy, have been systematically investigated in well-ordered Co2FeAl films with a biaxial anisotropy. It is found that the anisotropy factor Q, defined as fractional difference between hard and easy axes, changes from 0.35 to −0.09 T decreases 300 80 K, performing distinctive reorientation transition at ∼ 200 K. Through thickness-dependent measurement results, verified originate competitions...
A Gilbert damping anisotropy with a maximum–minimum ratio of ∼150% in ordered Co<sub>2</sub>FeAl has been experimentally demonstrated, which is attributed to the in-plane crystalline and can be explained by anisotropic spin–orbit interaction.
Paraffin fuel has been found to have a regression rate that is higher than conventional HTPB (hydroxyl-terminated polybutadiene) and, thus, presents itself as an ideal energy source for hybrid rocket engine. The characteristics of paraffin-based and calculated by the method minimum free energy. thermal degradation were measured paraffin, pretreated in different working conditions using differential scanning calorimetry (DSC) thermogravimetric analyzer (TGA). rates tested rectangular...
Laser induced magnetization dynamic behaviors of SmxFe1–x thin films with tunable x (0.25 ≤ 0.5) are investigated by the time-resolved magneto-optical Kerr effect. It is found that demagnetization process accomplished a two-stage process, time stage I within 1.0 ps (t1) for all samples different x, while it increases from 0 to 16 at II (t2) due reduced exchange coupling. By introducing an additional magneto-elastic energy contribution, dispersion relation precession frequency deduced, which...
In this article, the method of constant volume burner was used to measure solid propellant burning rate under high pressure. The formula and heat loss equation were derived, effects four factors (pressure increasing rate, time, ignition, rate) on during operation carried out. Furthermore, testing reproducibility analyzed. It shown that sample size precision, moles per unit mass propellant, main for accuracy method. shorter faster pressure rate; less loss, appropriate ignition way reduce...
Injecting spin current from ferromagnetic metals into two-dimensional (2D) transition-metal dichalcogenide semiconductors is expected to trigger a revolution in the next generation of energy-efficient spintronic and valleytronic devices. By investigating transport properties perpendicularly magnetized ${\mathrm{Mo}\mathrm{S}}_{2}/\mathrm{Pt}/[\mathrm{Co}/\mathrm{Ni}{]}_{2}$ ${\mathrm{Mo}\mathrm{S}}_{2}/\mathrm{Pt}/\mathrm{Ni}/[\mathrm{Co}/\mathrm{Ni}{]}_{2}$ heterostructures, here we...
Abstract In this work, a correlation between propellant burning rate and strain was established. order to investigate the effects of pressure, measure composite propellants, novel apparatus designed prepared. Burning rates three formula propellants under different pressures strains were measured using such device. Based on measurements, model for analysis experimental results proposed. It demonstrated that corresponded with data if samples tensile increasing from 0 20%. ratio obeyed...
When an aluminum droplet impacts a solid wall in rocket motor, its rebound changes the droplets’ motion parameters, making it difficult to precisely predict internal flowfield parameters as well performance of motor. In this paper, process droplet/wall impact is investigated experimentally, and semi-empirical model for calculation established. The results show that normal incident velocity increases from 0.63 , coefficient decreases 0.81 0.49. At same time, angle 0 50°, 0.6 0.8. tangential...