Large amplitude magnetization dynamics and the suppression of edge modes in a single nanomagnet
Large amplitude magnetization dynamics and the suppression of edge modes in a single nanomagnet
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DOI：
10.1063/1.3560457
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发表时间：
2011-02
影响因子：
4
通讯作者：
P. Keatley;P. Gangmei;M. Dvornik;R. Hicken;J. Childress;J. Katine
中科院分区：
文献类型：
--
作者：
P. Keatley;P. Gangmei;M. Dvornik;R. Hicken;J. Childress;J. Katine
利用时间分辨克尔显微镜研究了单个正方形纳米磁体的大振幅磁化动力学。实验光谱表明，只有一个单一的模式被激发的所有偏置场值。微磁模拟表明，在较大的脉冲场振幅的中心模式占主导地位的动态响应，而边缘模式几乎完全抑制。单个纳米磁体中的边缘模式的受控抑制在纳米级自旋转移扭矩振荡器和MEMS开关器件的操作中具有潜在的应用，对于所述纳米级自旋转移扭矩振荡器和MEMS开关器件，磁化轨迹的幅度通常较大并且期望更均匀的动态响应。
Large amplitude magnetization dynamics of a single square nanomagnet have been studied by time-resolved Kerr microscopy. Experimental spectra revealed that only a single mode was excited for all bias field values. Micromagnetic simulations demonstrate that at larger pulsed field amplitudes the center mode dominates the dynamic response while the edge mode is almost completely suppressed. Controlled suppression of edge modes in a single nanomagnet has potential applications in the operation of nanoscale spin transfer torque oscillators and bistable switching devices for which the amplitude of the magnetization trajectory is often large and a more uniform dynamic response is desirable.