Effect of a magnetic field pulse on ultrafast magnetization reversal in a submicron elliptical Permalloy thin film
Effect of a magnetic field pulse on ultrafast magnetization reversal in a submicron elliptical Permalloy thin film
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磁场脉冲对亚微米椭圆坡莫合金薄膜超快磁化反转的影响
DOI：
10.1063/1.2424526
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
G. Donohoe
中科院分区：
文献类型：
--
作者：
Q. Xiao;B. Choi;J. Rudge;Yang;G. Donohoe
利用微磁学模拟方法研究了磁场脉冲的大小、方向和上升、下降时间对超快磁化反转机制的影响。考虑具有400nm长轴、112nm短轴和3.2nm厚度的尺寸的椭圆形坡莫合金薄膜。磁场脉冲分量的图描述了三种类型的反转行为，准相干，非相干和非反转。在非相干旋进区，通过寻找脉冲截止时刻的最低反射总能量，找到了抑制磁化振铃的最佳磁场脉冲。脉冲的上升和下降时间仅在非相干旋进区对反转行为有显著影响。在该区域中，是否会发生反转取决于脉冲的上升时间。在非相干旋转区，延长脉冲的上升和下降时间并不导致总反射率的明显变化。
The characteristics of a magnetic field pulse, its magnitude, direction, and rise and fall time on the mechanism of ultrafast magnetization reversal have been studied by micromagnetic simulations. An elliptically shaped, Permalloy thin film, having dimensions of 400nm long axis, 112nm short axis, and 3.2nm, thickness, was considered. A plot of the magnetic field pulse components describes three types of reversal behaviors, quasicoherent, incoherent, and nonreversal. The optimum magnetic field pulse for the suppression of magnetization ringing is found in the incoherent precession area by finding the lowest remanent total energy at the moment the pulse is cut off. The rise and fall time of the pulse has a significant effect on the reversal behavior only in the incoherent precession region. In this region, whether a reversal can occur depends on the rise time of the pulse. Extending the rise and fall time of the pulse, in the noncoherent rotation region, does not lead to a clear change of the remanent total...