Title: Asymmetric Spin-wave Dispersion on Fe(110): Direct Evidence of Dzyaloshinskii--Moriya Interaction,
Abstract: The influence of the Dzyaloshinskii-Moriya interaction on the spin-wave
dispersion in an Fe double layer grown on W(110) is measured for the first
time. It is demonstrated that the Dzyaloshinskii-Moriya interaction breaks the
degeneracy of spin waves and leads to an asymmetric spin-wave dispersion
relation. An extended Heisenberg spin Hamiltonian is employed to obtain the
longitudinal component of the Dzyaloshinskii-Moriya vectors from the
experimentally measured energy asymmetry.