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Schematic illustration of the geometrically confined structure. The arrows represent the magnetization configuration inside the structure, which can be either a Bloch or a Néel domain wall.
Domain wall oscillation frequency as a function of the injected spin current drift velocity for constant α = (0.15, 0.25). The oscillation frequency shows a linear dependence on the current density over a broad frequency range between 500 MHz and 3.5 GHz. (A) The domain wall profile is symmetric under rotation for low current density . (B) At high current density , the domain wall shows asymmetric oscillations, this leads to a nonharmonic behavior.
Fourier spectrum of the magnetization component as a function of frequency for and various external field strength . At zero field, a sharp peak indicates an oscillation frequency of , whereas for higher field strenghts the oscillation frequency is shifted to lower frequencies down to (indicated by the red dashed line). Furthermore, higher order oscillations are visible by the peaks forming at higher frequencies.
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