Static Properties and Current-Driven Dynamics of Domain Walls in Perpendicular Magnetocrystalline Anisotropy Nanostrips with Rectangular Cross-Section

Figure 2

Current driven DW dynamics along a perfect strip with 𝐿_𝑦×𝐿_𝑧=120×3 nm². (a), (b), and (c) depict the micromagnetically (𝜇𝑀) computed temporal evolution of the DW width Δ, the DW velocity 𝑣, and the DW position 𝑥 under three different density currents: 𝑗_𝑎=0.1A/𝜇m², 𝑗_𝑎=0.2 A/μm², and 𝑗_𝑎=0.5 A/μm² for a nonadiabatic parameter of 𝜉=0.4. (d)–(g) show typical micromagnetic states of the propagating DW for currents larger than the Walker breakdown (𝑗_𝑎>𝑗_𝑊(𝜉)). (h) Time-averaged DW velocity as function of 𝑗_𝑎 for three different values of the nonadiabatic parameter: 𝜉=0, 𝜉=0.2 and 𝜉=0.4. Dots correspond to 𝜇𝑀 results, whereas lines are predictions from the 1 DM with Δ=8.325nm and 𝐻_𝐾=12533.5 A/m. (Reprinted with permission From [70, 72]. Copyright (2012), American Institute of Physics).