Spin-waves excitation in ferromagnetic nanowire

Recently, excitation of persistent magnetization precession in a nanowire with a pointcontact for spin-polarized current(SPC) injection has been demonstrated.[1] Here we present a complete numerical study of SPC-driven magnetization dynamics in an extended Py nanowire (x) with the width of 100nm (y) and a thickness of 6nm (z). The SPC is injected from a square 20-nm-thick CoFe 100x100 nm2 point-contact located in the center of the nanowire. We focus on the dynamics at low in-plane bias field (parallel to the nanowire axis) where the magnetization of the polarizer forms an off-center vortex