Magnetic vortex gyration mediated by point-contact position  

作　　者：Hua-Nan Li Zi-Wei Fan Jia-Xin Li Yue Hu Hui-Lian Liu 李化南;笵紫薇;李佳欣;胡月;刘惠莲(College of Physics, Jilin Normal University, National Demonstration Center for Experimental Physics Education,Jilin Normal University)

机构地区：[1]College of Physics, Jilin Normal University, National Demonstration Center for Experimental Physics Education,Jilin Normal University

出　　处：《Chinese Physics B》2019年第10期531-534,共4页中国物理B（英文版）

基　　金：Project supported by the Thirteenth Five-Year Program for Science and Technology of Education Department of Jilin Province,China(Grant No.JJKH20191007KJ);the Program for Development of Science and Technology of Siping City,China(Grant No.2016063)

摘　　要：Micromagnetic simulation is employed to study the gyration motion of magnetic vortices in distinct permalloy nanodisks driven by a spin-polarized current. The critical current density for magnetic vortex gyration, eigenfrequency, trajectory, velocity and the time for a magnetic vortex to obtain the steady gyration are analyzed. Simulation results reveal that the magnetic vortices in larger and thinner nanodisks can achieve a lower-frequency gyration at a lower current density in a shorter time. However, the magnetic vortices in thicker nanodisks need a higher current density and longer time to attain steady gyration but with a higher eigenfrequency. We also find that the point-contact position exerts different influences on these parameters in different nanodisks, which contributes to the control of the magnetic vortex gyration. The conclusions of this paper can serve as a theoretical basis for designing nano-oscillators and microwave frequency modulators.Micromagnetic simulation is employed to study the gyration motion of magnetic vortices in distinct permalloy nanodisks driven by a spin-polarized current. The critical current density for magnetic vortex gyration, eigenfrequency, trajectory, velocity and the time for a magnetic vortex to obtain the steady gyration are analyzed. Simulation results reveal that the magnetic vortices in larger and thinner nanodisks can achieve a lower-frequency gyration at a lower current density in a shorter time. However, the magnetic vortices in thicker nanodisks need a higher current density and longer time to attain steady gyration but with a higher eigenfrequency. We also find that the point-contact position exerts different influences on these parameters in different nanodisks, which contributes to the control of the magnetic vortex gyration. The conclusions of this paper can serve as a theoretical basis for designing nano-oscillators and microwave frequency modulators.

关 键 词：magnetic VORTEX SPIN-POLARIZED current POINT-CONTACT MICROMAGNETIC simulation 

分 类 号：O4[理学—物理]