Towards Laterally Resolved Ferromagnetic Resonance with Spin-Polarized Scanning Tunneling Microscopy
Towards Laterally Resolved Ferromagnetic Resonance with Spin-Polarized Scanning Tunneling Microscopy
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DOI：
10.3390/nano9060827
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发表时间：
2019-06-01
期刊：
影响因子：
5.3
通讯作者：
Wulfhekel, Wulf
中科院分区：
文献类型：
--
作者：
Herve, Marie;Peter, Moritz;Wulfhekel, Wulf
我们利用自旋极化扫描隧道显微镜，在液氦温度下，用零拍探测方法研究了W（110）上Fe岛中磁涡旋核的旋转。该技术的目的是在本地检测的自旋进动作为频率的函数使用的射频（rf）调制的隧道偏置电压。这种回旋是由隧道结中产生的自旋极化射频电流激发的。不同的贡献，在这种技术中预期的频率相关的信号的理论分析。除了铁磁谐振信号之外，这些信号还包括由I（U）特性的非线性引起的信号。的涡旋旋转建模与微磁有限元方法使用现实参数的隧道电流，其自旋极化，和岛的形状，并模拟与实验结果进行了比较。观察到的信号，并进行了严格的分析。
We used a homodyne detection to investigate the gyration of magnetic vortex cores in Fe islands on W(110) with spin-polarized scanning tunneling microscopy at liquid helium temperatures. The technique aims at local detection of the spin precession as a function of frequency using a radio-frequency (rf) modulation of the tunneling bias voltage. The gyration was excited by the resulting spin-polarized rf current in the tunneling junction. A theoretical analysis of different contributions to the frequency-dependent signals expected in this technique is given. These include, besides the ferromagnetic resonance signal, also signals caused by the non-linearity of the I(U) characteristics. The vortex gyration was modeled with micromagnetic finite element methods using realistic parameters for the tunneling current, its spin polarization, and the island shape, and simulations were compared with the experimental results. The observed signals are presented and critically analyzed.