Magnetic Bloch oscillations and domain wall dynamics in a near-Ising ferromagnetic chain
Ursula Hansen, Olav F. Syljuåsen, J. Jensen, T. K. Schäffer, Christopher Røhl Yskes Andersen, Martin Boehm, J. A. Rodriguez‐Rivera, N. B. Christensen, Kim Lefmann
Abstract
When charged particles in periodic lattices are subjected to a constant electric field, they respond by oscillating. Here we demonstrate that the magnetic analogue of these Bloch oscillations are realised in a ferromagnetic easy axis chain. In this case, the "particles" undergoing oscillatory motion in the presence of a magnetic field are domain walls. Inelastic neutron scattering reveals three distinct components of the low energy spin-dynamics including a signature Bloch oscillation mode. Using parameter-free theoretical calculations, we are able to account for all features in the excitation spectrum, thus providing detailed insights into the complex dynamics in spin-anisotropic chains.