Magnetic Bloch oscillations and domain wall dynamics in a near-Ising ferromagnetic chain

Ursula B. Hansen (), Olav F. Syljuåsen, Jens Jensen, Turi K. Schäffer, Christopher R. Andersen, Martin Boehm, Jose A. Rodriguez-Rivera, Niels B. Christensen and Kim Lefmann
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Ursula B. Hansen: University of Copenhagen
Olav F. Syljuåsen: University of Oslo
Jens Jensen: University of Copenhagen
Turi K. Schäffer: University of Copenhagen
Christopher R. Andersen: University of Copenhagen
Martin Boehm: Institut Laue-Langevin
Jose A. Rodriguez-Rivera: National Institute of Standards and Technology
Niels B. Christensen: Technical University of Denmark
Kim Lefmann: University of Copenhagen

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-29854-9

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