Numerical Investigation Of Domain Wall Motion In Magnetic Wires

The motion of domain walls in magnetic wires is investigated numerically using the program LLG Micromagnetics Simulator. Samples with different dimensions such as 8000x200x5 nm3, 800x200x20 nm3, and 800x40x5 nm3 are studied. The calculations are performed both without and with moving boundary condition, and assuming smooth edge and rough edge samples. The results show that the velocity of the domain wall is affected by the external field, roughness of the edge, the damping constant, and the dimensions of the sample. Two kinds of domain wall vortex structures are identified in addition to simple transverse domain structures: anti-vortex and vortex.