Two-dimensional(2D) ferromagnetic materials have been discovered with tunable magnetism and orbital-driven nodal-line features. Controlling the 2D magnetism in exfoliated nanoflakes via electric/magnetic fields enab...
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Two-dimensional(2D) ferromagnetic materials have been discovered with tunable magnetism and orbital-driven nodal-line features. Controlling the 2D magnetism in exfoliated nanoflakes via electric/magnetic fields enables a boosted Curie temperature(TC) or phase transitions. One of the challenges, however, is the realization of high TC2D magnets that are tunable, robust and suitable for large scale fabrication. Here, we report molecular-beam epitaxy growth of wafer-scale Fe3+XGeTe2films with TCabove room temperature. By controlling the Fe composition in Fe3+XGeTe2, a continuously modulated TCin a broad range of 185–320 K has been achieved. This widely tunable TCis attributed to the doped interlayer Fe that provides a 40% enhancement around the optimal composition X = 2. We further fabricated magnetic tunneling junction device arrays that exhibit clear tunneling signals. Our results show an effective and reliable approach, i.e. element doping, to producing robust and tunable ferromagnetism beyond room temperature in a large-scale 2D Fe3+XGeTe2fashion.
*** Cemented carbides are composites of WC ceramic phases and metallic Co binders that endow them with superior hardness and excellent *** metals are widely used as metal cutting and rock drilling tools[1,2].Their har...
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*** Cemented carbides are composites of WC ceramic phases and metallic Co binders that endow them with superior hardness and excellent *** metals are widely used as metal cutting and rock drilling tools[1,2].Their hardness is believed to be inversely proportional to the sizes of WC grains^([3]).Grain growth inhibitors are widely employed to achieve smaller grain sizes.
One-dimensional nanostructures of organic semiconductors exhibit distinctive optical and electrical properties. In this study, thin films containing densely aggregated, uniaxially oriented zinc phthalocyanine (ZnPc) n...
One-dimensional nanostructures of organic semiconductors exhibit distinctive optical and electrical properties. In this study, thin films containing densely aggregated, uniaxially oriented zinc phthalocyanine (ZnPc) nanowires are fabricated through vapor deposition on polytetrafluoroethylene (PTFE) friction-transferred films as orientation-inducing templates. The aggregation behavior of the ZnPc molecules depends on the substrate temperature (Ts) during deposition and the film thickness. Full-coverage aggregated ZnPc nanowires aligned parallel to the friction direction are formed in a film with a thickness of 20 nm deposited at Ts = 120 °C. Within the ZnPc nanowires, α-ZnPc crystals are aligned with the b-axis along the direction of nanowire growth and the a-axis perpendicular to the substrate. This indicates that the longitudinal direction of the ZnPc nanowires corresponds to the π‒π stacking direction of ZnPc molecules. A model detailing the growth of ZnPc nanowires on a PTFE film is proposed, elucidating the crystal growth and orientation through graphoepitaxial and epitaxial-like mechanisms. The PTFE friction-transferred film is demonstrated to be an effective template for the growth of aligned ZnPc nanowires. The uniaxially oriented, full-coverage ZnPc nanowire thin film fabricated on the PTFE template showed anisotropic electrical properties.
Deep learning algorithm emerges as a new method to take the raw features from large dataset and mine their deep implicit relations,which is promising for solving traditional physical challenges.A particularly intricat...
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Deep learning algorithm emerges as a new method to take the raw features from large dataset and mine their deep implicit relations,which is promising for solving traditional physical challenges.A particularly intricate and difficult challenge is the energy loss mechanism of energetic ions in solid,where accurate prediction of stopping power is a longtime *** this work,we develop a deep-learning-based stopping power model with high overall accuracy,and overcome the long-standing deficiency of the existing classical models by improving the predictive accuracy of stopping power for ultra-heavy ion with low energy,and the corresponding projected *** electronic stopping power model,based on deep learning algorithm,could be hopefully applied for the study of ion-solid interaction mechanism and enormous relevant applications.
The combination of excellent thermal stability and outstanding electrical performance is of great sig-nificance for piezoelectric ***,we have prepared 0.11Pb(In_(0.5)Nb_(0.5))O_(3)-0.89Pb(Hf_(0.47)Ti_(0.53))O_(3)-Sb_(...
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The combination of excellent thermal stability and outstanding electrical performance is of great sig-nificance for piezoelectric ***,we have prepared 0.11Pb(In_(0.5)Nb_(0.5))O_(3)-0.89Pb(Hf_(0.47)Ti_(0.53))O_(3)-Sb_(2)O_(5)(PIN-PHT-x Sb)ceramics by solid-phase method and investigated the effect of oxygen octahedral lattice distortion on microstructure and macroscopic electrical *** distortion index of oxygen octahedra is studied by Rietveld refinement,showing that optimal octahedral distortion can soften B-O repulsion,disrupt long-range ordered ferroelectric domains,and enhance local heterogeneities,signifi-cantly increasing piezoelectric ***,outstanding thermal stability and ultrahigh piezo-electric response of PIN-PHT-1.2Sb ceramics are realized under the synergistic influence of octahedral distortion,excellent density,and large grain *** with PIN-PHT ceramics,PIN-PHT-1.2Sb ce-ramics exhibit ultrahigh piezoelectric responses(d_(33)=706 pC/N,k_(p)=0.68,ε_(r)=3244),a high Curie temperature(T C)of 300℃,excellent thermal stability,and anti-fatigue properties.
In the present study,samples of a titanium carbide nanoparticle-reinforced nickel alloy(Ni-TiC_(NP)composite)were irradiated with 1 MeV He ions at 700°*** evolution of He bubbles and nanohardness was characterize...
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In the present study,samples of a titanium carbide nanoparticle-reinforced nickel alloy(Ni-TiC_(NP)composite)were irradiated with 1 MeV He ions at 700°*** evolution of He bubbles and nanohardness was characterized using transmission electron microscopy(TEM)and nanoindentation,*** images showed that the size and number density of He bubbles in the grains were affected by the He ion *** number density first increased significantly and then decreased with increasing ion dose,while the size exhibited an inverse ***,the swelling induced by He bubbles continuously increased with increasing ion *** bubbles also formed in the grain boundaries,interior of the TiC nanoparticles,and interfaces between the TiC nanoparticles and Ni *** measurements indicated a decrease in nanohardness after irradiation,which is attributed to the disappearance of intrinsic dislocation lines caused by He ion irradiation.
In this paper, the Cr-coated accident tolerant fuel (ATF) cladding model with initial crack is developed to simulate mechanical behaviors when considering the multi-field coupling. Initial cracks with different length...
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Depending on the relative rates of coupling and dissipation, a light-matter coupled system is either in the weak- or strong-coupling regime. Here, we present a unique system where the coupling rate continuously increa...
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Depending on the relative rates of coupling and dissipation, a light-matter coupled system is either in the weak- or strong-coupling regime. Here, we present a unique system where the coupling rate continuously increases with an externally applied magnetic field while the dissipation rate remains constant, allowing us to monitor a weak-to-strong coupling transition as a function of magnetic field. We observed a Rabi splitting of a terahertz magnon mode in yttrium orthoferrite above a threshold magnetic field of ∼14 T. Based on a microscopic theoretical model, we show that with increasing magnetic field the magnons transition into magnon polaritons through an exceptional point, which will open up new opportunities for in situ control of non-Hermitian systems.
We experimentally demonstrate reduced dimensionality in a interacting ensemble of emitters. The well-known stretched exponential decay dynamics, (Equation presented) with β = 0.5 in 3D geometries, is strikingly modif...
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Gold nanoparticles (AuNPs) have attracted great interest in a variety of medical applications such as computed tomography (CT), nuclear imaging, therapy, photoacoustic, ultrasound, and magnetic resonance imaging (MRI)...
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