Broadband Magnetic Response of Periodic Arrays of FeNi Dots
Broadband Magnetic Response of Periodic Arrays of FeNi Dots
复制标题
FeNi 点周期性阵列的宽带磁响应
DOI：
10.1109/tmag.2008.2002527
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发表时间：
2008
影响因子：
2.1
通讯作者：
F. Aliev
中科院分区：
文献类型：
--
作者：
J. F. Sierra;A. Awad;G. Kakazei;F. Palomares;F. Aliev
我们使用基于矢量网络分析仪（工作频率为 300 kHz 至 8.5 GHz）的宽带磁力计，研究了室温下 50 nm 厚、半径为 500 nm、不同中心距（1200 和 2500 nm）的 FeNi (Py) 圆形磁点周期性阵列中的磁化动力学。我们还对动态响应、铁磁共振 (FMR) 及其线宽与磁化曲线等静态磁特性进行了比较。 FMR 峰值出现在成核场上方，考虑到单个磁点的退磁因子，基特尔公式完美地描述了 FMR 峰值。除了 FMR 之外，我们还观察到低于均匀模式的自旋波共振，这可能归因于受限系统中的自旋波。 FMR 线宽显示出靠近与磁涡旋成核相对应的场区域的显着加宽。
We present a study of magnetization dynamics at room temperature in periodic arrays of 50 nm thick FeNi (Py) circular magnetic dots of 500 nm radius and different center to center distance (1200 and 2500 nm), by using a broadband magnetometer based on vector network analyzer which works between 300 kHz and 8.5 GHz. We also present a comparison between the dynamic response, ferromagnetic resonance (FMR) and its linewidth, with static magnetic characteristics such as magnetization curves. The FMR peak appears just above the nucleation field and is perfectly described by Kittel formula taking into account the demagnetizing factor of an individual magnetic dot. In addition to FMR we observed a spin wave resonance below the uniform mode, which could be attributed to spin waves in confined systems. The FMR linewidth shows a significant broadening close to the field region corresponding to nucleation of magnetic vortex.