Fig. 6: Current control in STNO array.
From: Nonlinear dynamics of directly coupled skyrmions in ferrimagnetic spin torque nano-oscillators
a Structure of our 3 × 3 STNO array under consideration. The dashed circles indicate the current injection areas (labeled Osc1-Osc9) with the identical diameters of 30 nm and center-to-center distance of 70 nm. The current densities are adopted to be 67, 66, 66, 71, 75, 68, 69 and 72 MA cm−2 for j1-j4 and j6-j9. b FFT spectra of the recorded magnetizations averaged over 45 × 45 nm2 areas, with different values of j5 injected into the central STNO (Osc5). The curves in b have been shifted vertically for clarity. c The time evolution of the phase difference (θ1 − θ5) and order parameter (ζ) with different values of j5.
