Observation of angle-dependent mode conversion and mode hopping in 2D annular antidot lattice.

ABSTRACT: We report spin-wave excitations in annular antidot lattice fabricated from 15 nm-thin Ni₈₀Fe₂₀ film. The nanodots of 170 nm diameters are embedded in the 350 nm (diameter) antidot lattice to form the annular antidot lattice, which is arranged in a square lattice with edge-to-edge separation of 120 nm. A strong anisotropy in the spin-wave modes are observed with the change in orientation angle (ϕ) of the in-plane bias magnetic field by using Time-resolved Magneto-optic Kerr microscope. A flattened four-fold rotational symmetry, mode hopping and mode conversion leading to mode quenching for three prominent spin-wave modes are observed in this lattice with the variation of the bias field orientation. Micromagnetic simulations enable us to successfully reproduce the measu

SUBMITTER: Porwal N 

PROVIDER: S-EPMC6702203 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature