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• W4281288082 endingPage "169500" @default.
• W4281288082 startingPage "169500" @default.
• W4281288082 abstract "The discovery of asymmetric domain wall velocities in magnetic alloys and multilayers without a heavy metal underlayer has given rise to claims of a large Dzyaloshinskii-Moriya interaction (DMI) driven by compositional non-uniformities. However, these non-uniformities also give rise to vertically non-uniform magnetic properties which can influence the dynamic properties of domain walls. In this work, we use micromagnetic simulations to show that vertical modulation of the saturation magnetization can give rise to asymmetric domain wall velocities for field and current driven motion, closely resembling the presence of a DMI. For field driven motion, by comparing the velocity asymmetries for varying saturation magnetization gradients, film thicknesses, and average saturation magnetization, we show that the magnitude of effective symmetry breaking field resulting from the non-uniformity can be comparable to those resulting from DMI. These effects scale with thickness and degree of modulation, mirroring recent results in single layer materials. However, the scaling of domain velocity asymmetries is largely suppressed for SOT driven domain dynamics. Therefore, great care needs to be taken when evaluating DMI in non-uniform systems." @default.
• W4281288082 created "2022-05-24" @default.
• W4281288082 creator A5009910657 @default.
• W4281288082 creator A5027238642 @default.
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• W4281288082 date "2022-09-01" @default.
• W4281288082 modified "2023-09-26" @default.
• W4281288082 title "Domain wall velocity asymmetries driven by saturation magnetization gradients without a Dzyaloshinskii-Moriya interaction" @default.
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• W4281288082 doi "https://doi.org/10.1016/j.jmmm.2022.169500" @default.
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