Spin wave scattering and interference in ferromagnetic cross

Abstract

Magnetostatic spin wave scattering and interference across a CoTaZr ferromagnetic spin wave waveguide cross junction were investigated experimentally and by micromagnetic simulations. It is observed that the phase of the scattered waves is dependent on the wavelength, geometry of the junction, and scattering direction. It is found that destructive and constructive interference of the spin waves generates switching characteristics modulated by the input phase of the spin waves. Micromagnetic simulations are used to analyze experimental data and simulate the spin wave scattering and interference. V

Tunable Angle-Dependent Magnetization Dynamics in Ni80Fe20 Nanocross Structures of Varying Size

“…However, the ultrafast magnetization dynamics measured by time-resolved magneto-optical Kerr effect revealed very rich dynamics with a strong configurational anisotropy [30]. Later in 2015, a report [31] proposed that ferromagnetic cross-shaped elements can be used as reconfigurable spin-based logic device using SW scattering and interference. More recent study [32] on cross-shaped nanodot arrays using broadband ferromagnetic resonance (FMR) measurements showed a bias field tunable magnetic configuration and magnetization dynamics, including the presence of mode softening and mode crossover.…”

Bias‐Field Tunable Magnon‐Magnon Coupling in Ni80Fe20 Nanocross Array

“…However, such studies in nanoscale ferromagnets are still at a nascent stage. This includes, ferromagnetic nanocross (NC) elements [28] which possess complex ground-state spin configurations [31][32] as well as rich spin wave (SW) properties [33][34][35] showing various rich phenomena such as magnonic mode softening, mode crossover, mode splitting, mode merging, and nonlinear ferromagnetic resonance shift in their dynamical response. Interestingly this system also exhibited two avoided crossings in the magnetic field dispersion of SW frequencies characteristic of magnon-magnon coupling of SW modes confined inside the individual elements acting as a magnonic cavity.…”

Asymmetric scattering behaviors of spin wave dependent on magnetic vortex chirality

“…The dispersion effect of SWs caused by the geometric characteristics of the waveguide structure can be called geometric scattering of SWs (SW geo ). [39] Therefore, it can be considered that the source of SW geo is located at the edges of both sides of the cross region. Obviously, in the no-VC case, the SWs scattered into arms 2 and 4 consist of two parts: one is the SW geo and the other is the SWs caused by the vortex circulation scattering (SW C ).…”