Spin-waves propagation along planar domain wall channels with perpendicular intersection

Abstract

Spin-waves have been intensely investigated as a promising candidate for information carriers. The excitation and propagation of spin-waves along reconfigurable magnonic circuits are of much interest for the development of magnonic applications. In the present paper, the spin-wave propagation in a reconfigurable domain wall (DW) channel is investigated theoretically through micromagnetic simulations in the perpendicular ferromagnetic film. The non-linear propagation scheme with a perpendicular intersection linking the transverse and longitudinal DW channels is realized by using the coherent excitation without applying an external field. The intensity of spin-waves propagating along DW channels exhibits a significant enhancement compared to bulk-type spin-wave propagation and a nano-sized wavelength with the maximum phase velocity exceeding 2 km/s is achieved. Moreover, the DW-type spin-waves propagation presents close correlation with the Dzyaloshinskii–Moriya interaction and the shift angle of the pinning layer magnetization relative to wave vector, which will determine the feasibility of spin-wave propagation passing through the perpendicular intersection of DW channels under different input modes. Consequently, the available logic gates of and, or, and not A are proposed by tuning the shift angle along longitudinal DW, based on the three-terminals device with two transverse inputs and one longitudinal output.