Ultrafast generation and depinning of skyrmions in synthetic antiferromagnets

Le résumé fourni par la source

Abstract The generation and depinning of antiferromagnetic (AFM) skyrmions are essential for the development of AFM spintronics. In this work, we study theoretically the generation and depinning of bilayer-skyrmions in synthetic antiferromagnets. The laser induced ultrafast generation of skyrmions through modulating the local anisotropy is revealed by the atomistic micromagnetic simulations, which demonstrates the dependences of the skyrmion size and numbers on the laser frequency and acting region. In addition, the dependences of the critical depinning current on the defect strength and intrinsic parameters are derived theoretically and simulated numerically. It is demonstrated that the critical current is dependent on the damping constant and interlayer coupling due to the skyrmion oscillation, and the depinning of dynamic skyrmion is much easier than the static skyrmion especially in the weakly damping regime. Thus, this work provides useful information in understanding the laser induced generation and defect depinning of the bilayer-skyrmions, benefiting material selections in future experiments and applications.

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