Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Disentangling factors governing Dzyaloshinskii domain wall creep in Co/Ni thin films using Pt(x)Ir(1-x) seedlayers



Derek Lau, J.P. Pellegren, Hans T. Nembach, Justin M. Shaw, Vincent Sokalski


We characterize asymmetric growth of magnetic bubble domains in perpendicularly magnetized Co/Ni multi-layers grown on PtxIr1-x seedlayers by application of perpendicular and in-plane magnetic Fields. Using a refined model of domain wall creep that incorporates contributions from the anisotropic elastic energy, ", and a chirality-dependent prefactor, v0, we elucidate factors that govern the mobility of Dzyaloshinskii domain walls as a function of seedlayer composition. The interfacial Dzyaloshinskii-Moriya Interaction magnitude is found to decrease monotonically with xIr, which is independently confirmed by Brillouin light scattering (BLS). Moreover, the persistence of significant asymmetry in velocity curves across the full composition range supports previous assertions that a chirality-dependent attempt frequency akin to chiral damping could play a critical role in the observed trends. This work helps resolve fundamental questions about the factors governing Dzyaloshinskii DW creep and demonstrates varying Pt-Ir seedlayer composition as a method to tune DMI.
Physical Review Letters


Dzyaloshinskii-Moriya, Brillouin Light Scattering, Magnetic Domains, Spinwave, Skyrmion, DW creep
Created August 16, 2018, Updated June 16, 2020