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Coupling of skyrmions mediated by the RKKY interaction

2018; American Institute of Physics; Volume: 113; Issue: 21 Linguagem: Inglês

10.1063/1.5062168

1520-8842

R. Cacilhas, Vagson L. Carvalho‐Santos, Smiljan Vojkovic, E. B. Carvalho, A. R. Pereira, D. Altbir, Álvaro S. Núñez,

Metallic Glasses and Amorphous Alloys

A discussion on the interaction between skyrmions in a bi-layer system connected by a non-magnetic metal is presented. From considering a free charge carrier model, we have shown that the Ruderman-Kittel-Kasuya-Yosida (RKKY ) inter- action can induce attractive or repulsive interaction between the skyrmions depending on the spacer thickness. We have also shown that due to an increasing in RKKY energy when the skyrmions are far from each other, their widths are diminished. Finally, we have obtained analytical solutions to the skyrmion position when the in-plane distance between the skyrmions is small and it is shown that an attractive RKKY interaction yields a skyrmion precessory motion. This RKKY-induced coupling could be used as a skyrmion drag mechanism to displace skyrmions in multilayers.