Waveguide characteristics of adjustable magnetorheological mechanical topological insulator

A structure of tunable magnetorheological mechanical topological insulator that uses magnetorheological elastomers as matrix and pure iron as scatterer is designed. By changing the external magnetic field, the elastic modulus of the matrix is affected, and the size and width of the bandgap are adjusted to give the structure adjustability. The waveguide characteristics, the adjustability of topology edge state, the effect of point defects, and the time-domain characteristics of the structure are studied by the finite element method. The tunable range of the structure is increased by 446%; the elastic wave can propagate well in the linear channel and Z channel, there is a certain loss of the elastic amplitude at the output; the point defects have a great influence on the transmission loss, and the abrupt peak value is easy to appear, and there is a “transition region” near the upper and lower boundaries.