Spin-filter van der Waals Magnetic tunnel junctions (sf-vdW MTJs) formed by an interlayer antiferromagnetic (AFM) vdW semiconductor as a barrier have exhibited promising prospects in achieving a high tunneling magneto...
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Spin-filter van der Waals Magnetic tunnel junctions (sf-vdW MTJs) formed by an interlayer antiferromagnetic (AFM) vdW semiconductor as a barrier have exhibited promising prospects in achieving a high tunneling magnetoresistance (TMR) ratio in MTJs. Here, using first-principles calculations, we investigate the spin-dependent transport and the TMR effect of sf-vdW MTJs formed by sandwiching bilayer and trilayer NiBr2 barriers between two graphite electrodes (Gr/NiBr2/Gr sf-vdW MTJs). Similar to the experimental results of sf-vdW MTJs formed by a few-layer CrI3 barrier, the TMR ratios of the Gr/NiBr2/Gr sf-vdW MTJs increase first with the increase of bias voltage and decrease with the further increase of bias voltage after reaching the highest points because the conduction bands of the interlayer ferromagnetic (FM) NiBr2 barrier at the K points go into the bias window earlier than those of the interlayer AFM NiBr2 barrier with the increase of bias voltage. Compared to the TMR ratios of about 170% and 206% at zero bias voltage, the TMR ratios of the Gr/NiBr2/Gr sf-vdW MTJs with bilayer and trilayer NiBr2 barriers are largely increased about 34 and 67 times by the optimized bias voltage, respectively. Correspondingly, a giant TMR ratio of about 6000% and 14 000% can be achieved in the Gr/NiBr2/Gr sf-vdW MTJs with bilayer and trilayer NiBr2 barriers at 0.14 and 0.125 V bias voltage, respectively. Our results elucidate the mechanism of bias voltage induced giant TMR ratio in the Gr/NiBr2/Gr sf-vdW MTJs and provide promising routes for developing MTJs with a high TMR ratio.
We report on charge state measurements of laser-accelerated carbon ions in the energy range of several MeV penetrating a dense partially ionized plasma. The plasma was generated by irradiation of a foam target with la...
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Environmental pollution of heavy metal(loid)s (HMs) caused adverse impacts, has become one of the emerging concerns and challenges worldwide. Metal(loid)s can pose significant threats to living organisms even when pre...
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Drugs and other substances with psychoactive substances have the potential to alter body functioning and structure when ingested either for medical or recreational purposes. The study investigated the effects of ethan...
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ISBN:
(数字)9798350358155
ISBN:
(纸本)9798350358162
Drugs and other substances with psychoactive substances have the potential to alter body functioning and structure when ingested either for medical or recreational purposes. The study investigated the effects of ethanol with Nicotiana tabacum and Cannabis sativa on markers of brain function and hematological parameters through both an experimental and docking predictive approach. Thirty-five female Wistar rats with an average weight of 180 ± 0.5 g were randomly assigned to seven treatment groups of five rats each: ethanol, Nicotiana tabacum, Cannabis sativa, ethanol + Nicotiana tabacum, ethanol + Cannabis sativa, and ethanol + Nicotiana tabacum + Cannabis sativa. The dosage of the substance administered in each group includes 30 ml/kg body weight (BW) of 40% ethanol, 13.44 g/kg BW of Nicotiana tabacum, and 6.72 g/kg BW of Cannabis sativa. Smoke from Nicotiana tabacum and Cannabis sativa sativa was inhaled for five minutes while ethanol was given orally. At the end of the 28-day treatment, the rats were euthanized. Brain homogenates underwent biochemical assays and blood parameters were examined. There was a significant decrease (p<0.05) in malondialdehyde (MDA) concentration in the ethanol group in comparison to the treated groups and the control group. On the contrary, the groups exposed to Nicotiana tabacum and Cannabis sativa smoke, as well as the control group showed a significant increase (p<0.05) in total protein concentration compared to the ethanol group. There was a significant decrease (p<0.05) in catalase activity in the ethanol group compared to the treated groups and the control group. Furthermore, there was a significant increase (p<0.05) in HGB and RDW in groups exposed to Nicotiana tabacum and Cannabis sativa smoke respectively, and in the control group in comparison to the ethanol group. When compared to ethanol and nicotine, delt-9-tetrahydrocannabinol had the highest binding energy across receptor proteins. Ethanol, nicotine, and delt-9- tetrahydr
The structural and physical properties of two single-grain Au-Al-Gd 1/1 approximant crystals (ACs) with analyzed compositions Au73.67Al12.24Gd14.09 and Au74.67Al11.35Gd13.98 were thoroughly investigated. The two varia...
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The structural and physical properties of two single-grain Au-Al-Gd 1/1 approximant crystals (ACs) with analyzed compositions Au73.67Al12.24Gd14.09 and Au74.67Al11.35Gd13.98 were thoroughly investigated. The two variants are isostructural (cubic, space group: Im3¯), undergoing sharp antiferromagnetic (AFM) transitions at TN=9.6 K and TN=8.3 K, respectively. Specific-heat measurements in both samples evidenced sharp jump at TN, associated with the AFM transition, accompanied by broad Schottky-type anomalies at lower temperatures. Strikingly, the two 1/1 ACs exhibited markedly different responses to applied magnetic fields: one displayed a pronounced metamagnetic anomaly while the other did not. In this regard, variational calculations with adiabatic transformation of the magnetic field in realistic structural models identified the existence of two possible AFM phases: the cuboc phase with a metamagnetic anomaly and the cluster Néel phase without it, thereby clearly revealing the possible magnetic structures of the present AFM variants. These findings have led to the establishment of a comprehensive magnetic-phase diagram for Heisenberg-type 1/1 ACs. This work not only advances our understanding of magnetic-phase transitions in these complex systems but also suggests the existence of a broader spectrum of unexplored magnetic states in Tsai-type materials.
ABACUS (Atomic-orbital Based Ab-initio Computation at USTC) is an open-source software for first-principles electronic structure calculations and molecular dynamics simulations. It mainly features density functional t...
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One-dimensional(1D)metal halide perovskite nanowire(NW)arrays with high absorption efficiency,emission yield and dielectric constants,as well as anisotropic optoelectronic properties have found applications in energy ...
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One-dimensional(1D)metal halide perovskite nanowire(NW)arrays with high absorption efficiency,emission yield and dielectric constants,as well as anisotropic optoelectronic properties have found applications in energy harvesting,flexible electronics,and biomedical imaging ***,a modified two-step solvothermal method is developed for the synthesis of self-assembled cubic CsPbBr_(3) NW *** method provides facile access to continuous and uniform ultrafine perovskite NWs and well-aligned pure perovskite NW arrayed *** excitation at 365 nm,the CsPbBr_(3) NWs give a strong blue emission observable to the naked *** CsPbBr_(3) NWs also exhibit strong two-photon excited luminescence under the irradiation with an 800 nm pulse *** rotating the polarization angle of the 800 nm laser,strong polarization dependence with a polarization degree up to~0.49 is demonstrated in the selfassembled CsPbBr_(3) NW array,although the CsPbBr_(3) NWs have an isotropic cubic *** on density functional theory(DFT)calculations,this polarization-dependent emission is correlated with the anisotropic charge density distribution of the perovskite *** findings suggest that the ultrafine CsPbBr_(3) NWs with a well-defined self-assembled architecture could be applied as next-generation polarizationsensitive photoelectronic detection materials.
An improved quantum trajectory Monte Carlo method including the Stark shift of the initial state, Coulomb potential, and multielectron polarization-induced dipole potential is adopted to revisit the origin of the low-...
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An improved quantum trajectory Monte Carlo method including the Stark shift of the initial state, Coulomb potential, and multielectron polarization-induced dipole potential is adopted to revisit the origin of the low-energy interference structure in the photoelectron momentum distribution of the xenon atom subjected to an intense laser field, and resolve the different contributions of these three effects. We found that the Stark shift plays an essential role on the low-energy interference structure, which moves the ringlike constructive interference structure to the lower momentum region. The formation of the low-energy interference structure is a result of the combined effects of Stark shift, laser, and Coulomb fields, while the multielectron polarization mainly enhance the probability of the low energy photoelectron spectrum. Our finding provides insight into the electron dynamics of atoms and molecules when driven by the intense laser fields.
Piezo-photocatalysis of ZnO nanostructures had recently well attracted due to their exceptional potential in degrading the antibiotics and scalable hydrogen production. Here, we have synthesized the Ce3+ doped ZnO nan...
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