Fig. 3: Micromagnetic modeling.

a FFT amplitude spectrum as a function of frequency from micromagnetic simulations of different devices. The spectrum is acquired by doing FFT on the time revolution of spatial-averaged magnetization \({\bar{m}}_{z}(t)\) in the center region of the nanowire excited by a spin current. b Top views of spatial FFT images on the Py layer of Py5/Pt5 obtained at EM and BM resonance frequencies. c Top view of spatial FFT images of the Py layer (top) and LAFO layer (bottom) of a LAFO20/Py5/Pt5 device. The image size for the Py5 layer is 1500 × 400 nm² and for the LAFO20 layer is 1500 × 1500 nm². The logarithmic color scale is on the right, where the color represents the FFT amplitude of \({m}_{z}(x,y)\).