纳米接触点的变化对磁涡旋核极性反转的控制

Control of magnetic vortex polarity reversal by changing point contacts

通过微磁模拟的方法研究了纳米接触点的个数、尺寸以及位置对磁涡旋核极性反转的影响.模拟计算显示,与纳米接触点被设置在盘中央对比,如果纳米接触点被设置在偏离盘中央时,磁涡旋核极性反转的临界电流密度和反转时间都会大幅度减小.当设置两个纳米接触点时,如果改变半径小的接触点的位置,则仅对临界反转电流密度有明显影响;如果改变的是半径大的接触点的位置,则对临界反转电流密度和反转时间都有影响.所有的模拟计算都显示纳米接触点的个数、尺寸以及位置均不影响磁涡旋核的反转速度.

The effects of the number,size and position of point contacts on the magnetic vortex polarity reversal were studied by means of micromagnetic simulation.The simulation results show that the critical current density and reversal time are greatly reduced when the point contacts are set off-centered disk compared with the point contacts are set in the center of the disk.In the case of two point contacts,only the critical current density is significantly affected if the position of point contact with a small radius is changed,and the critical current density and reversal time are both affected if the position of point contact with a large radius is changed.All the simulation results show that the number,size and position of point contacts do not influence the velocity of reversal.