Fig. 5: Parametric dependence of oscillation frequency.
From: Elongated skyrmion as spin torque nano-oscillator and magnonic waveguide
The oscillation frequency as a function of the driving current density j for different exchange stiffness A and Dzyaloshinskii-Moriya interaction constant D. Here, D is fixed at 3.5 mJ m−2 in (a), and A = 15 pJ m−1 in (b). The yellow filled squares, green filled circles and pink filled triangles in (a) denote the case of A = 14, 15 and 16 pJ m−1, respectively. The yellow squares, green circles and pink triangles in (b) represent the case of D = 3.4, 3.5 and 3.6 mJ m−2, respectively. Phase diagrams of the oscillation versus the current density j and (c) the perpendicular magnetic anisotropy value Kp or (d) the width w of the pinning sites, where A = 15 pJ m−1, D = 3.5 mJ m−2 and the color bar represents the oscillation frequency.
