Xi Zhang

Snow-like SnSe ₂ flakes were successfully synthesized via polymer-assisted deposition, with their morphological evolution and ferromagnetic properties effectively tuned through Fe doping.

By constructing stable 2D/2D GaN/HfS _x Se _{2− x} S-scheme heterojunctions, this study achieves suppressed recombination and preserved strong redox potentials, boosting solar-to-hydrogen efficiency from 0.28% to 50.64%.

This work provides the first experimental validation of the universality of the BMP scaling law, T _C ∝ ( xδ ) ^0.5 , and establishes aliovalent donor engineering as a powerful strategy for high-performance oxide spintronics.

Two-dimensional (2D) transition metal tetrafluoride materials usually demonstrate antiferromagnetic or altermagnetic ordering, exhibiting potential in spintronics applications. In this work, we systematically investigate the structural, electronic, and magnetic properties of osmium tetrafluoride (OsF4), a member of 2D transition metal tetrafluoride material family, through comprehensive hybrid functional theory calculations. Our data indicate the mechanical, dynamical, and thermodynamical stability of the 2D OsF4. Band structure calculations incorporating spin–orbit coupling reveal that 2D OsF4 behaves as an indirect bandgap semiconductor with a forbidden gap of 2.75 eV. Through detailed analysis of the non-collinear ferromagnetic ground state, we quantitatively determine the dominant magnetic interactions, including exchange coupling, Dzyaloshinskii–Moriya interaction, and magnetic anisotropy energy, demonstrating the prevalence of nearest-neighbor magnetic coupling. Monte Carlo simulations based on the derived Heisenberg model parameters predict a relatively low Curie temperature of 18 K in 2D OsF4. Furthermore, the emergence of a nonzero magnon gap at the Γ point in the calculated magnon spectrum provides direct evidence of significant magnetic anisotropy effects in this system.

Biomass carbon (BC) materials derived from agricultural waste have shown great potential in microwave absorption (MA). However, current research mainly focuses on high-frequency (8–18 GHz) MA, and much less effort has been spent on low-frequency (2–8 GHz) MA and other important functionalities such as energy storage. Herein, corn silk rich in carbon is utilized to prepare BC materials with uniform pores and large specific surface area through a straightforward chemical activation and carbonization process. Attributed to its optimized impedance matching, interfacial polarization and (N and O) heteroatom-induced dipole polarization, the optimal sample exhibits superior low-frequency MA capability, including a strong reflection loss (RL) of −75 dB at 6.88 GHz, an effective absorption bandwidth (EAB, RL ≤ −10 dB) down to 2.8 GHz, and excellent radar cross-section reduction. Furthermore, it achieves a high initial discharge specific capacity of 1015.54 mA·h g⁻¹ and stable cycling performance at 0.5 A g⁻¹ in lithium-ion batteries owing to its heteroatom-rich porous structure with a large specific surface area. Our study offers a simple and low-cost way to fabricate high-performance multifunctional BC materials for low-frequency MA and lithium-ion energy storage.

Fe-doped β-Ga ₂ O ₃ DMS film exhibits high M _s and low H _c (70 emu cm ⁻³ and 12 Oe at 300 K). The high M _s originates from the Ga vacancy-enhanced ferromagnetic coupling between the BMPs.

Two-dimensional (2D) intrinsic ferromagnetic (FM) materials with high Curie temperatures (Tc), large perpendicular magnetic anisotropy (PMA), and large spin polarization are desirable for atomically thin spintronic devices. Herein, we propose a 2D intrinsic FM material Mn2GeI2 monolayer with thermodynamical stability and outstanding FM properties using first-principles calculations. Our calculations show that Mn2GeI2 monolayer is a half-metal with a spin gap of 1.76 eV, which ensures 100% spin polarization ratio at the Fermi level. Importantly, Mn2GeI2 monolayer has a large PMA energy of 2.90 meV and a high Tc of 648 K, ideal for practical applications at room temperature. Further in-depth investigation of microscopic coupling in the Mn2GeI2 monolayer reveals that the robust ferromagnetism mainly resulted from the synthetic effect of Ruderman–Kittel–Kasuya–Yosida exchange interaction between the Mn ion layers and superexchange interaction within the Mn ion layers. Our results give insights into the structure and electronic and magnetic properties of Mn2GeI2 monolayer and provide a promising candidate for 2D spintronic devices.

Recently, it has been reported that the skyrmion Hall effect can be suppressed in an elliptical skyrmion-based device. Given that defects are unavoidable in materials, it is necessary and important to investigate the dynamics of an elliptical skyrmion in a defective racetrack device. In this work, the current-driven dynamics of an elliptical skyrmion in a defective racetrack device are systematically studied using micromagnetic simulations. The system energy analysis reveals that the magnetic parameters of the circular defect play critical roles in determining the type (repulsive or attractive) and the magnitude of the force on the elliptical skyrmion. The simulated trajectories show that the primary motion modes of the elliptical skyrmion in the defective racetrack can be divided into four types, which are dependent on the values of the Dzyaloshinskii–Moriya interaction (DMI) constant D_d, the perpendicular magnetic anisotropy constant K_d, the magnitude of the driving current density J, and the size d of the defect. Further investigation of the motion-mode phases of the skyrmion reveals the synthetic effects of D_d, K_d, J, and d. Finally, the minimum depinning current density J, which linearly depends on the parameters of D_d and K_d, is obtained for a skyrmion completely pinned in the defect. Our findings give insights into the dynamics of an elliptical skyrmion in the presence of a defect with different magnetic parameters in a racetrack device and may be useful for performance enhancement of skyrmion-based racetrack memory devices.