磁性Skyrmions信息存储器的微磁学模拟

Micromagnetic Simulation of Magnetic Skyrmions Information Carrier

为了解决当前存储信息技术的发展问题,人们发现了一种新型的高密度信息载体——磁性Skyrmions.实现对磁性Skyrmions生成和输运的微观调控是完成其器件化过程中至关重要的一步.本文基于微磁学模拟方法,通过OOMMF软件首先在纳米盘模型中详细研究了自旋极化电流注入对磁性Skyrmions生成的影响.在局域电流注入过程中,调节自旋极化电流密度、电流注入时间和注入电流面积,得到了不同注入电流面积下阈值电流密度以及注入时间对Skyrmions拓扑数的影响;在全局电流注入中,实现了两种手性Skyrmions的生成,并讨论了模型尺寸对于Skyrmions拓扑数和尺寸的影响,对于低能耗、高密度新型Skymions信息存储器的研发提供了理论指导.

In order to solve the bottleneck in the development of information storage technology,a new high-density information carrier,magnetic skyrmions,have attracted considerable attention.It is an important step to realize the micro-control of the generation and transport of magnetic skyrmions for its applications in devices.Based on the micromagnetic simulation method,the spin polarized current beam is firstly studied in detail in the nano-disk model through OOMMF software.In the process of local current injection,we adjust the spin polarized current density,current injection time and injection current area,and get the effect of threshold current density and injection time on the topological number of skyrmions under different injection current areas.In the global current injection,we realize the generation of two kinds of chiral skyrmions,and discuss the model size effects.This work provides theoretical guidance for the research and development of new skymions information memory with low energy consumption and high density.