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(Color online) (a) Schematic diagram of a spin valve consisting of a perpendicular polarizer and a vortex free layer. The positive current is defined as the electrons flowing from the free layer to the polarizer. (b) Schematic diagram for the different forces exerted on the VC.
(Color online) Dynamic evolution of the averaged magnetization for the in-plane component (a) and for the out-of-plane component (b) at . The corresponding Fourier spectra are shown in (c) and (d), respectively. The inset of (a) shows the zoom-in picture of in the beginning time of .
(Color online) (a) The in-plane orbit trajectory of the VC motion. The snapshot images for the out-of-plane component during the dynamic evolutions are shown in (b)–(d), corresponding to the moments marked in (a). The zoom-in picture shows the small region around the VC of the plot (c), where the yellow arrows represent the direction of the in-plane magnetization components, the red and blue ribbons denote the and isosurfaces, respectively.
(Color online) Calculated frequency spectra of dependence on the current density.
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