Symmetry-broken in thin-film ferromagnets with in-plane anisotropy.

Planar ferromagnetic channels have been shown to theoretically support However, realistic materials exhibit in-plane anisotropy, which breaks the axial symmetry assumed in current theoretical models. Here, we study in a ferromagnet with in-plane anisotropy from a dispersive hydrodynamic perspective. Through the analysis of a boundary value problem for a damped sine-Gordon equation, in a ferromagnetic channel can be excited above a spin current threshold that depends on material parameters and the length of the channel. Micromagnetic simulations are used to verify that the analytical results are qualitatively correct, even in the presence of non-local dipole fields. Simulations also confirm that can be driven by spin transfer torque in a finite-sized region. These results delineate the important material parameters that must be optimized for the excitation of in realistic systems.