Magnetic reversal stability of spin textures in synthetic antiferromagnetic nanodots

In this work, we demonstrate the nucleation and stability of spin textures in synthetic antiferromagnetic (SAF) nanodot-shaped systems. By employing micromagnetic simulations at 300 K and zero-field, we obtain phase diagrams distinguishing antiferromagnetic (AFM) single domain, skyrmion and skyrmionium states, among other relevant spin textures, depending on the magnetic and geometric parameters of the circular disk. Furthermore, we investigate the magnetization reversal stability under out-of-plane magnetic fields, revealing that, only under specific conditions, AFM skyrmionic textures are preserved in the absence of magnetic fields. The conservation of the skyrmionic structures along the hysteresis cycle is directly linked with an energy barrier reduction for the nucleation of the spin textures. Our findings demonstrate a very promising route in stabilizing AFM chiral skyrmionic structures in nanodots, at ambient conditions, which is a step towards their use in future antiferromagnetic devices.