Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session UU01: V: General Physics I
5:00 AM–7:00 AM,
Wednesday, March 22, 2023
Room: Virtual Room 1
Sponsoring
Unit:
APS
Chair: Xin Shi, University of Houston
Abstract: UU01.00009 : Theory of Stabilization and Adiabatic Current Drive of Skyrmions in Synthetic Antiferromagnets*
6:36 AM–6:48 AM
Presenter:
Rawana Yagan
(Koc University)
Authors:
Rawana Yagan
(Koc University)
Mehmet Cengiz Onbasli
(Koc University)
Here, we provide the theory of stabilizing SAF skyrmions by extending the ferromagnetic skyrmion theory to antiferromagnetically coupled FM/NM/FM multilayers (here: Co/CoFeB/Ir/CoFeB/Co). Our micromagnetic model results indicate that the material parameters such as saturation magnetization, Dzyaloshinskii–Moriya interaction constant, uniaxial anisotropy, and interlayer exchange can yield equilibrium skyrmion radii between 1-50 nm. Skyrmions on both ferromagnetic layers are stabilized based on the balance of interlayer and intralayer exchange, shape, uniaxial (Ku), Zeeman, and Dzyaloshinskii–Moriya interaction anisotropy energy. The skyrmion stability strongly depends on Ms, Ku, and DMI constants.
Next, we investigated the effect of perpendicular external current drive and the out-of-plane external magnetic field on the skyrmion velocity, SAF skyrmion decoupling thresholds, and the adiabatic drive. Increasing external magnetic field (until 120 mT) triggers SAF skyrmion velocities as high as 196 m s-1. The skyrmions on both sides decouple when the current density is 4x1011 A m-2 and this decoupling current decreases with the external magnetic field. The phase diagram of skyrmion velocity under different magnetic field and current bias indicates that the skyrmions can be driven with currents between 108–3x1011 A m-2 without topological Hall effect or decoupling.
These results could pave the way for new understanding of functional SAF skyrmions and their applications.
*Funding support from European Research Council (ERC) Starting Grant (project no. 948063, SKYNOLIMIT) is acknowledged.
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