Skyrmion inertia in synthetic antiferromagnets - Archive ouverte HAL
Article Dans Une Revue Physical Review B Année : 2022

Skyrmion inertia in synthetic antiferromagnets

Résumé

We describe the dynamics of magnetic skyrmions in synthetic antiferromagnets (SAF) with a finite interlayer coupling. Due to the opposite gyrovector of the skyrmions in the two SAF layers, the coupled skyrmions reach a stationary regime with a spatial separation in a direction orthogonal to their velocity. As a consequence, and contrary to the ferromagnetic situation, a transient regime necessarily occurs with a finite acceleration, related to an inertia, and that limits its time response. The formalism developed here, based on two coupled Thiele equations, allows a quantitative description of this phenomenon. The time constant associated with the transient regime scales inversely with the antiferromagnetic coupling constant. We also show that the coupling force reaches a maximal value at a finite skyrmion separation. This sets a maximum velocity limit, beyond which the coupling force cannot stabilize the bound state.
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hal-04295796 , version 1 (20-11-2023)

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Sujit Panigrahy, Sougata Mallick, João Sampaio, Stanislas Rohart. Skyrmion inertia in synthetic antiferromagnets. Physical Review B, 2022, 106 (14), pp.144405. ⟨10.1103/physrevb.106.144405⟩. ⟨hal-04295796⟩
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