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

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...

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Bibliographic Details
Published in:Nature communications 2022-05, Vol.13 (1), p.2547-2547, Article 2547
Main Authors: Hansen, Ursula B., Syljuåsen, Olav F., Jensen, Jens, Schäffer, Turi K., Andersen, Christopher R., Boehm, Martin, Rodriguez-Rivera, Jose A., Christensen, Niels B., Lefmann, Kim
Format: Article
Language:English
Subjects:
639/301/119/2793
639/766/119/997
639/766/483/1139
Chains
Charged particles
Domain walls
Electric fields
Electron spin
Excitation spectra
Ferromagnetism
Humanities and Social Sciences
Inelastic scattering
Ising model
Lattices
Magnetic domains
Magnetic fields
Magnetism
multidisciplinary
Neutron scattering
Neutrons
Oscillation modes
Oscillations
Particle physics
Science
Science (multidisciplinary)
Spin dynamics
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Summary: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. An electron subject to a periodic potential and a constant electric field exhibit oscillatory dynamics, known as Bloch oscillations. Here, the authors demonstrate a magnetic analogue of Bloch oscillations in a ferromagnetic near-Ising chain, where magnetic excitations oscillate in response to a magnetic field.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-022-29854-9