调制磁晶各向异性优化斯格明子的赛道设计

发布时间：2018-03-15 20:58

本文选题：斯格明子　切入点：微磁学计算　出处：《四川师范大学》2017年硕士论文　论文类型：学位论文

【摘要】：磁性斯格明子,由于它的稳定性、小尺寸和所需相当低的驱动电流等优点,有望成为代替磁畴壁的下一代的数据存储的基本单元。然而,由于受到马格努斯力的作用,斯格明子会在偏离电流的方向运动,因此可能在赛道的边缘处湮灭,造成信息的丢失。本论文运用微磁学的方法理论,采用OOMMF软件进行三维模拟,计算了斯格明子在通过调制磁晶各向异性来优化的两种赛道中的运动情况,主要结果如下:1.提出了一种基于斯格明子的新型赛道结构,即在Co Pt赛道的两侧边缘对称地加上高K材料,该赛道能很好地将斯格明子限制在赛道的中间区域,并且还能解决斯格明子在赛道末端的堵塞和在边缘处的湮灭问题。此外,斯格明子在靠近赛道的边界处会发生横向和纵向的振荡行为,但赛道两侧边缘的DMI值对斯格明子的运动几乎无影响。另外,通过调节赛道的材料和几何参数优化赛道设计,能实现较小的驱动电流获得较大的斯格明子运动速度。2.提出了一种双通道的赛道结构,更新和优化了在赛道中二进制数据的表示方式。模拟结果显示,通过改变D、w_m、K_(uv)的值,可以调节斯格明子在单通道或双通道中运动。
[Abstract]:Because of its stability, small size and relatively low driving current, the magnetic spinner is expected to be the basic unit for the next generation of data storage in place of the magnetic domain wall. However, due to the effect of Magnus force, Schumminon will move away from the current, so it is possible to annihilate at the edge of the track, resulting in the loss of information. In this paper, we use the theory of micromagnetics and OOMMF software to carry out 3D simulation. The motion of Schumminon in two kinds of track optimized by magnetocrystalline anisotropy modulation is calculated. The main results are as follows: 1. A new circuit structure based on Schumminon is proposed. That is, adding high K materials symmetrically to both sides of the Co Pt circuit, the track can well limit the skimming in the middle of the track, and it can also solve the problem of skimming blocking at the end of the track and annihilation at the edge. Sgriminger oscillates horizontally and longitudinally near the edge of the track, but the DMI values on both sides of the track have little effect on the motion. In addition, the track design is optimized by adjusting the material and geometric parameters of the circuit. A two-channel circuit structure is proposed, which updates and optimizes the representation of binary data in the track. The simulation results show that by changing the value of DWM _ M _ T _ KT _ uv, the simulation results show that, by changing the value of DWM _ M _ T _ K _ T _ uv _ v, a two-channel circuit structure is proposed, and the expression of binary data in the circuit is updated and optimized. It can adjust the motion of Schumminon in single channel or double channel.
【学位授予单位】：四川师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP333;O441.2

【参考文献】