Abstract
We have investigated dynamic behavior of a three-dimensional magnetic domain wall (DW) having a Bloch-point structure in a cylindrical ferromagnetic nanowire via micromagnetic simulations. We have found the existence of an onset depinning behavior of the Bloch-point domain wall (BP-DW) motion under external magnetic fields, which is originated from overcoming an intrinsic pinning barrier generated from spin configuration of the Bloch-point domain wall inner structure. Ultrafast sequential switching of Bloch-point spins is expected to have a single precessional motion with negligible ringing on a few picoseconds time scale, which might be attractive for future spintronic applications.
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