Hu Shaojie, Cui Xiaomin, Wang Kang, Yakata Satoshi, Kimura Takashi
Center for Spintronics and Quantum Systems, State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Department of Physics, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan.
Nanomaterials (Basel). 2022 Jul 4;12(13):2295. doi: 10.3390/nano12132295.
The resonance property of a magnetic vortex contained within a micron-sized square Py dot was detected using an amplitude-modulated magnetic field excitation technique. We found a significant modulation of the resonant spectra as the external magnetic field changes. The Lorentzian-like spectrum changes from a peak to a dip via a transition of anti-Lorentzian-like spectra. By conducting the micromagnetic simulations, we confirmed that the transition behavior results from the unusual resistance change depending on the vortex core center position. Additionally, the power dependence of the anti-Lorentzian-like spectra revealed a fairly persistent coexistence of peak and dip. Thus, the tunable spectra suggest one way to develop an integratable radiofrequency microcircuits.
利用调幅磁场激发技术检测了微米级方形Py点内磁涡旋的共振特性。我们发现，随着外部磁场的变化，共振光谱有显著调制。类洛伦兹光谱通过类反洛伦兹光谱的转变从峰值变为谷值。通过进行微磁模拟，我们证实了这种转变行为是由取决于涡旋核中心位置的异常电阻变化引起的。此外，类反洛伦兹光谱的功率依赖性揭示了峰值和谷值相当持久的共存。因此，可调谐光谱为开发可集成射频微电路提供了一种途径。
