Driving skyrmions in flow regime in synthetic ferrimagnets

Sougata Mallick (), Yanis Sassi, Nicholas Figueiredo Prestes, Sachin Krishnia, Fernando Gallego, Luis M. Vicente Arche, Thibaud Denneulin, Sophie Collin, Karim Bouzehouane, André Thiaville, Rafal E. Dunin-Borkowski, Vincent Jeudy, Albert Fert, Nicolas Reyren and Vincent Cros ()
Additional contact information
Sougata Mallick: Université Paris-Saclay
Yanis Sassi: Université Paris-Saclay
Nicholas Figueiredo Prestes: Université Paris-Saclay
Sachin Krishnia: Université Paris-Saclay
Fernando Gallego: Université Paris-Saclay
Luis M. Vicente Arche: Université Paris-Saclay
Thibaud Denneulin: ER-C for Microscopy and Spectroscopy with Electrons
Sophie Collin: Université Paris-Saclay
Karim Bouzehouane: Université Paris-Saclay
André Thiaville: Université Paris-Saclay
Rafal E. Dunin-Borkowski: ER-C for Microscopy and Spectroscopy with Electrons
Vincent Jeudy: Université Paris-Saclay
Albert Fert: Université Paris-Saclay
Nicolas Reyren: Université Paris-Saclay
Vincent Cros: Université Paris-Saclay

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract The last decade has seen significant improvements in our understanding of skyrmions current induced dynamics, along with their room temperature stabilization, however, the impact of local material inhomogeneities still remains an issue that impedes reaching the regime of steady state motion of these spin textures. Here, we study the spin-torque driven motion of skyrmions in synthetic ferrimagnetic multilayers with the aim of achieving high mobility and reduced skyrmion Hall effect. We consider Pt|Co|Tb multilayers of various thicknesses with antiferromagnetic coupling between the Co and Tb magnetization. The increase of Tb thickness in the multilayers reduces the total magnetic moment and increases the spin-orbit torques allowing to reach velocities up to 400 ms−1 for skyrmions with diameters of about 160 nm. We demonstrate that due to reduced skyrmion Hall effect combined with the edge repulsion of the magnetic track, the skyrmions move along the track without any transverse deflection. Further, by comparing the field-induced domain wall motion and current-induced skyrmion motion, we demonstrate that the skyrmions at the largest current densities present all the characteristics of a dynamical flow regime.

Date: 2024
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DOI: 10.1038/s41467-024-52210-y

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