Yu Wang 교수

Magnetic skyrmions with a topological particle nature are considered as potential information carriers for future spintronics memory and logic devices. The stabilization of magnetic skyrmions at zero magnetic field in nanostructured components is a prerequisite for incorporating them into advanced nonvolatile memory devices. Here, using a real-space phase field model based on Ginzburg-Landau theory, we demonstrate that ferroelectric polarization can stabilize magnetic skyrmions at zero magnetic

Understanding the dynamic behaviors of magnetic skyrmions has great potential in the application of spintronics. This is especially the case for the interaction between two skyrmions. In the literature, the attractive and repulsive skyrmion-skyrmion interactions are demonstrated as strongly related to the distance of two skyrmions and external magnetic fields. However, as a natural property, the temperature effect on skyrmion-skyrmion interactions is unclear, which lacks understanding from therm

Discovery of non-trivial topological structures in condensed matters holds promise in novel technological paradigms. In contrast to ferromagnetics, where a variety of topological structures such as vortex, meron, and skyrmion have been discovered, only few topological structures can exist in ferroelectrics due to the lack of non-collinear interaction like the Dzyaloshinskii-Moriya interaction in ferromagnetics. Here, we demonstrate that polarization structures with a wide range of topological nu

Engineering the kinetic motion of magnetic skyrmions shows great potential in spintronics. Particularly, as a natural property, temperature plays a significant role in the dynamics of skyrmions. For instance, the nonlinear and the rectilinear motions of skyrmions driven by spin-transfer torque and local energy imbalance in temperature gradients, respectively, have been explored. Although existing studies have already implied the multiphysics field-controlled property of skyrmion thermal motion,

The topological magnetic structures in ferromagnetic thin films, such as magnetic skyrmions, are considered as the potential information carriers for future spintronics memory and logic devices due to their topological stability and controllability. In the application, ferromagnetic thin films often experience different temperatures, strains and magnetic fields. To understand the stability of topological magnetic structures in ferromagnetic thin films under different external conditions is not o

On the basis of the principle of caustics, a comprehensive experimental system for real imaging-virtual imaging was designed and established and then applied to dynamic fracture mechanics experiments. An explosion load experimental system was used to investigate the interaction between blast stress waves and prefabricated cracks. The virtual image information of the caustic spot of the crack tip under the radial compressive stress of the explosive load was captured and quantified. Combined with

Effective modeling of magnetization dynamics is key to understanding the nature of exotic magnetic structures and behaviors such as magnetic skyrmions and spin waves. Although the modeling of magnitude variation of magnetizations is crucial for magnets at finite temperatures (especially near the Curie temperature with the precursor effect), it is restrained in common micromagnetic simulations. Here, we propose an effective methodology for modeling the magnitude-fluctuated magnetization dynamics

Abstract Wood cell walls consist of a nano-scale ultrastructure, in which cellulose microfibrils are embedded within a hemicellulose-lignin matrix. Although this ultrastructure likely differs between softwoods and hardwoods, detailed comparative information remains limited. In our previous study, we investigated the thermal reactivity of cellulose and hemicellulose in the cell walls of Japanese cedar and Japanese beech, to explore their ultrastructural organization, based on the hypothesis that