Fig. 4: Effects of the current density and the damping on the oscillation of an elongated skyrmion.
From: Elongated skyrmion as spin torque nano-oscillator and magnonic waveguide
a Frequency of the considered oscillation as a function of the driving current density j, where the pink and purple regions denote the pinned phase and annihilation phase, respectively. b Time-dependent of the magnetization 〈mz〉 in the cases of pinned and annihilation. Insets are the final stable magnetization configurations. c Oscillation frequency as a function of the damping coefficient α. d Snapshots of the dynamical annihilation process of an elongated skyrmion.
