Multiple low-energy excitation states in FeNi disks observed by broadband ferromagnetic resonance measurement
Multiple low-energy excitation states in FeNi disks observed by broadband ferromagnetic resonance measurement
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通过宽带铁磁共振测量观察到 FeNi 盘中的多个低能激发态
DOI：
10.1103/physrevb.94.184421
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发表时间：
2016-11
影响因子：
3.7
通讯作者：
Wu Y. Z.
中科院分区：
文献类型：
--
作者：
Huo Y.;Zhou C.;Sun L.;Chui S. T.;Wu Y. Z.
通过宽带铁磁共振（FMR）测量研究了不同直径微米级 FeNi 圆盘的磁化激发。除了主要的 FMR 峰外，还观察到能量较低的附加吸附峰。微磁模拟和量子自旋波计算都证实低能激发态归因于反向体积静磁（BVM）自旋波。在直径大于500 nm的50 nm厚的Py盘上系统地研究了低能态的尺寸依赖性，发现第一BVM态的线宽明显小于FMR吸收峰的线宽。通过与实验结果的定量比较，量子自旋波计算被证明是一种可靠的磁化率计算方法，并且比经典的微磁模拟快得多。
Magnetization excitation in micron sized FeNi disks with different diameters is studied by broadband ferromagnetic resonance (FMR) measurement. Except the main FMR peak, additional adsorption peaks with lower energies are observed. Both micromagnetic simulation and quantum spin wave calculation confirm that the low-energy excitation states are attributed to backward volume magnetostatic (BVM) spin waves. The size dependence of the low-energy states is systematically studied in 50-nm-thick Py disks with diameters larger than 500 nm, and the linewidth of the first BVM state is found to be obviously smaller than that of the FMR absorption peak. Through a quantitative comparison with experimental results, the quantum spin wave calculation is proven to be a reliable method to get the susceptibility and is much faster than the classical micromagnetic simulations.
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