Suppression of spin-wave nonreciprocity due to interfacial Dzyaloshinskii-Moriya interaction by lateral confinement in magnetic nanostructures

Brillouin light scattering (BLS) experiments assisted by micromagnetic simulations show that the difference in frequency between counterpropagating spin waves in extended films and multilayers, induced by interfacial Dzyaloshinskii--Moriya interaction (i-DMI), is strongly reduced when lateral confinement is introduced. This poses a limit to the exploitation of BLS to quantify the i-DMI strength in the case of magnetic elements, such as dots and wires, with lateral dimensions below about 400 nm.