The skyrmion generator is one of the indispensable components for the future functional skyrmion devices,but the process of generating skyrmion cannot avoid mixing with other magnetic textures,such as skyrmionium and ...The skyrmion generator is one of the indispensable components for the future functional skyrmion devices,but the process of generating skyrmion cannot avoid mixing with other magnetic textures,such as skyrmionium and nested skyrmion bags.These mixed magnetic textures will inevitably lead to the blockage of skyrmion transport and even the distortion of data information.Therefore,the design of an efficient skyrmion filter is of great significance for the development of skyrmion-based spintronic devices.In this work,a skyrmion filter scheme is proposed,and the high-efficiency filtering function is demonstrated by micromagnetic simulations.The results show that the filtering effect of the scheme depends on the structure geometry and the spin current density that drives the skyrmion.Based on this scheme,the polarity of the filtered skyrmion can be controlled by switching the magnetization state at the output end,and the“cloning”of the skyrmion can be realized by geometric optimization of the structure.We believe that in the near future,the skyrmion filter will become one of the important components of skyrmion-based spintronic devices in the future.展开更多
Field-driven magnetic domain wall propagation in ferromagnetic nanostrips with trapezoidal cross section has been systematically investigated by means of micromagnetic simulation. Asymmetric dynamic behaviors of domai...Field-driven magnetic domain wall propagation in ferromagnetic nanostrips with trapezoidal cross section has been systematically investigated by means of micromagnetic simulation. Asymmetric dynamic behaviors of domain wall, depending on the propagation direction, were observed under an external magnetic field. When the domain walls propagate in the opposite direction along the long axis of the nanostrip, the Walker breakdown fields as well as the average velocities are different. The asymmetric landscape of demagnetization energies, which arises from the trapezoidal geometry, is the main origin of the asymmetric propagation behavior. Furthermore, a trapezoid-cross-section nanostrip will become a nanotube if it is rolled artificially along its long axis, and thus a two-dimensional transverse domain wall will become a three-dimensional one. Interestingly, it is found that the asymmetric behaviors observed in two-dimensional nanostrips with trapezoidal cross section are similar with some dynamic properties occurring in three-dimensional nanotubes.展开更多
Fast in situ switching of magnetic vortex core in a ferromagnetic nanodisk assisted by a nanocavity,with diameter comparable to the dimension of a vortex core,is systematically investigated by changing the strength as...Fast in situ switching of magnetic vortex core in a ferromagnetic nanodisk assisted by a nanocavity,with diameter comparable to the dimension of a vortex core,is systematically investigated by changing the strength as well as the diameter of the effective circular region of the applied magnetic field.By applying a local magnetic field within a small area at the nanodisk center,fast switching time of about 35 ps is achieved with relatively low field strength(70 mT)which is beneficial for fast data reading and writing.The reason for this phenomenon is that the magnetic spins around the nanocavity is aligned along the cavity wall due to the shape anisotropy when the perpendicular field is applied,which deepens the dip around the vortex core,and thus facilitates the vortex core switching.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.12364020)the Scientific and Technological Development Plan of Jilin Province,China(Grant No.20240101295JC)+1 种基金the Science and Technology Research and Planning Project of Jilin Provincial Department of Education(Grant No.JJKH20230611KJ)the Applied Foundation Research Project(Talent Funding Project)of Yanbian University(Grant No.ydkj202241).
文摘The skyrmion generator is one of the indispensable components for the future functional skyrmion devices,but the process of generating skyrmion cannot avoid mixing with other magnetic textures,such as skyrmionium and nested skyrmion bags.These mixed magnetic textures will inevitably lead to the blockage of skyrmion transport and even the distortion of data information.Therefore,the design of an efficient skyrmion filter is of great significance for the development of skyrmion-based spintronic devices.In this work,a skyrmion filter scheme is proposed,and the high-efficiency filtering function is demonstrated by micromagnetic simulations.The results show that the filtering effect of the scheme depends on the structure geometry and the spin current density that drives the skyrmion.Based on this scheme,the polarity of the filtered skyrmion can be controlled by switching the magnetization state at the output end,and the“cloning”of the skyrmion can be realized by geometric optimization of the structure.We believe that in the near future,the skyrmion filter will become one of the important components of skyrmion-based spintronic devices in the future.
基金Project supported by the National Key R&D Program of China(Grant Nos.2017YFB0903700 and 2017YFB0903702)Yichang Government Fund(Grant No.A19-402-a05)+1 种基金the Korea Research Foundation(NRF)(Grant No.2018R1A2B3009569)Korea Basic Science Institute(KBSI)(Grant No.D39614).
文摘Field-driven magnetic domain wall propagation in ferromagnetic nanostrips with trapezoidal cross section has been systematically investigated by means of micromagnetic simulation. Asymmetric dynamic behaviors of domain wall, depending on the propagation direction, were observed under an external magnetic field. When the domain walls propagate in the opposite direction along the long axis of the nanostrip, the Walker breakdown fields as well as the average velocities are different. The asymmetric landscape of demagnetization energies, which arises from the trapezoidal geometry, is the main origin of the asymmetric propagation behavior. Furthermore, a trapezoid-cross-section nanostrip will become a nanotube if it is rolled artificially along its long axis, and thus a two-dimensional transverse domain wall will become a three-dimensional one. Interestingly, it is found that the asymmetric behaviors observed in two-dimensional nanostrips with trapezoidal cross section are similar with some dynamic properties occurring in three-dimensional nanotubes.
基金Supported by the Fund of Key Laboratory of Advanced Materials of Ministry of Education(Grant No.ADV21-20)。
文摘Fast in situ switching of magnetic vortex core in a ferromagnetic nanodisk assisted by a nanocavity,with diameter comparable to the dimension of a vortex core,is systematically investigated by changing the strength as well as the diameter of the effective circular region of the applied magnetic field.By applying a local magnetic field within a small area at the nanodisk center,fast switching time of about 35 ps is achieved with relatively low field strength(70 mT)which is beneficial for fast data reading and writing.The reason for this phenomenon is that the magnetic spins around the nanocavity is aligned along the cavity wall due to the shape anisotropy when the perpendicular field is applied,which deepens the dip around the vortex core,and thus facilitates the vortex core switching.
