Micromagnetic simulation of domain wall dynamics in Permalloy nanotubes at high frequencies

作者：Betancourt I; Hrkac G; Schrefl T

来源：Journal of Applied Physics, 2008, 104(2): 023915.

DOI：10.1063/1.2960480

The formation and motion of a single cross-tie type domain wall (DW) was studied in a Ni(80)Fe(20) Permalloy nanotube of 50 nm thickness and 500 nm length by means of micromagnetic simulations. Circular magnetization curves, calculated with circumferential ac magnetic fields applied on the nanotube, showed that the propagation of the DW along the nanotube length occurred for h(rms) values as low as 166 A/m at a frequency of 250 MHz. In general, the observed DW motion exhibited an out-of-phase oscillating character, relative to the applied hac field, with a normalized phase shift of 0.20 being independent of h(rms). The DW damping was observed at 10 GHz.

• 出版日期2008-7-15