Abstract

The influence of the parameters of the control pulse of a magnetic field with the shape of a rectangular trapezoid on the dynamics of domain walls in ferrite garnets and orthoferrites is studied. The calculation results are compared with experimental data obtained by the high-speed photography method. It is shown that the front edge of the control pulse with duration of less than 80 ns has a slight effect on the dynamics of the domain wall in materials in which the velocity of domain wall motion does not exceed several hundred meters per second. If the domain wall velocity is several kilometers per second, then a front edge with a duration of 50 ns leads to long acceleration of the domain wall to the maximum velocity and reduces the time required for the wall to move with this velocity, thereby limiting the possibility of additional control over the wall dynamics. It is shown that an excessively long front edge of the pulse can lead to a decrease in the maximum velocity of the domain wall and its mobility in the experimental measurements. An excessively short control pulse with a fixed amplitude leads to a decrease in the maximum displacement of the domain wall and, consequently, to a decrease in the time of motion with a constant velocity that corresponds to a given amplitude of the control pulse.

中文翻译：

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控制磁场脉冲参数对畴壁动力学的影响

摘要

研究了矩形梯形磁场控制脉冲参数对铁氧体石榴石和正铁氧体畴壁动力学的影响。计算结果与高速摄影法获得的实验数据进行了比较。结果表明，在畴壁运动速度不超过每秒几百米的材料中，持续时间小于 80 ns 的控制脉冲的前沿对畴壁的动力学有轻微的影响。如果畴壁速度为每秒几公里，那么持续时间为 50 ns 的前沿会导致畴壁长时间加速到最大速度，并减少畴壁以该速度移动所需的时间，从而限制了对壁动力学进行额外控制的可能性。结果表明，过长的脉冲前沿会导致畴壁的最大速度及其在实验测量中的迁移率降低。具有固定幅度的过短的控制脉冲导致畴壁的最大位移减小，因此，以对应于控制脉冲的给定幅度的恒定速度运动的时间减小。