Modal oscillation control in internally patternedNi80Fe20thin film microstructures
Modal oscillation control in internally patternedNi80Fe20thin film microstructures
复制标题
内部图案Ni80Fe20薄膜微结构中的模态振荡控制
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
M. R. Freeman
中科院分区：
文献类型：
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作者：
M. Belov;Zhigang Liu;R. Sydora;M. R. Freeman
采用时间分辨扫描克尔显微镜和微磁模拟方法对光刻多晶铁磁薄膜Ni 80 Fe 20元素的宽带磁化动力学进行了实验研究。在微弱的面内静态偏置场的作用下，研究了小的面外瞬变磁脉冲对磁化极化分量的时空响应。在均匀的方形板中，空间响应受到与偏置场方向横向闭合域相关的非均匀静态磁化分布的强烈控制。一个圆形的针孔图案在一个正方形的血小板中心，表明空间模式的磁化振荡响应也敏感地依赖于弱变化的静态磁化。Landau - Lifshitz - Gilbert模型再现了观测到的模态振荡对称性，并详细揭示了实验中观测到的空间非均匀阻尼是在畴边界附近能量向较短波长的模态转换的结果。
The broadband magnetization dynamics (MD) of lithographic, polycrystalline thin film ferromagnetic Ni 8 0 Fe 2 0 elements is studied experimentally using time-resolved scanning Kerr microscopy and numerically via micromagnetic simulation. The spatiotemporal evolution of the polar component of magnetization in response to a small out-of-plane transient magnetic pulse is imaged in the presence of a weak in-plane static bias field. In a uniform square platelet the spatial response is strongly controlled by the nonuniform static magnetization distribution associated with the closure domains transverse to the bias field direction. A circular pinhole is patterned in the center of a square platelet to show that the spatial pattern of magnetization oscillation response also depends sensitively on weaker variations of the static magnetization. The Landau Lifshitz Gilbert model reproduces the observed modal oscillation symmetry and reveals in detail that the observation of spatially nonuniform damping in the experiment is a result of conversion of energy into shorter wavelength modes in the vicinity of the domain boundaries.