NiFe-based vortex spin-torque nano-oscillators (STNO) have been shown to be rich dynamic systems which can operate as efficient frequency generators and detectors, but with a limitation in frequency determined by the gyrotropic frequency, typically sub-GHz. In this report, we present a detailed analysis of the nature of the higher order spin wave modes which exist in the Super High Frequency range (3–30 GHz). This is achieved via micromagnetic simulations and electrical characterisation in magnetic tunnel junctions, both directly via the spin-diode effect and indirectly via the measurement of the coupling with the gyrotropic critical current. The excitation mechanism and spatial profile of the modes are shown to have a complex dependence on the vortex core position. Additionally, the inter-mode coupling between the fundamental gyrotropic mode and the higher order modes is shown to reduce or enhance the effective damping depending upon the sense of propagation of the confined spin wave.

基于NiFe的涡旋自旋纳米振荡器（STNO）已被证明是丰富的动态系统，可以作为有效的频率发生器和检测器运行，但受回旋频率（通常低于GHz）确定的频率受到限制。在本报告中，我们对超高频范围（3–30 GHz）中存在的高阶自旋波模式的性质进行了详细分析。这可以通过磁隧道结中的微磁模拟和电气特性来实现，既可以通过自旋二极管效应直接实现，也可以通过与回旋临界电流耦合的测量来间接实现。模式的激发机制和空间轮廓显示出对涡旋核心位置的复杂依赖性。此外，