Magnetic droplet solitons are non-linear dynamical modes that can be excitedin a thin film with perpendicular magnetic anisotropy with aspin-transfer-torque. Although droplet solitons have been proved to be stablewith a hysteretic response to applied currents and magnetic fields at lowtemperature, measurements at room temperature indicate less stability andreduced hysteresis width. Here, we report evidence of droplet soliton driftinstabilities, leading to drift resonances, at room temperature that explainstheir lower stability. Micromagnetic simulations show that the driftinstability is produced by an effective field asymmetry in the nanocontactregion that can have different origins.
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