Authors:	Jefremovas, Elizabeth M. de la Fuente Rodríguez, María Alba Venero, Diego Echevarría–Bonet, Cristina Bender, Philipp Fåk, Björn Blanco, Jesús A. Barquín, Luis Fernández
Title:	Magnetic super-structure and active surface role in the onset of magnetic excitons revealed in TbCu2 nanoparticles
Online publication date:	4-Dec-2023
Year of first publication:	2023
Language:	english
Abstract:	Antiferromagnetic materials are receiving renewed interest on behalf of their potential for information technologies. Recent reports have also revealed how the physics governing such magnetic arrangements and their excitations become more complex compared to traditional ferromagnetic materials, especially at the nanoscale. Here, we address two main issues that are of prime interest to their technological transfer. First, using small-angle neutron scattering, we show the existence of a magnetic helix-like super-structure in a polycrystalline TbCu2 alloy, preserved at both bulk and nanoparticle ensembles of 8 nm. Second, using inelastic neutron scattering, we elucidate the magnetic excitons and the crystalline electric field energy level schemes of TbCu2 in bulk and nanoparticle ensembles. This allows to understad the effect of the surface broken symmetry on the quantum energy levels at the nanoscale, so as the key role of interfacial effects on the propagation of magnetic excitations. Our research provides insights for the realization of magnetic moment dynamics models based on complex nanometric super-structures, and for nanoparticles to be integrated in spintronics and information technology applications.
DDC:	530 Physik 530 Physics
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 08 Physik, Mathematik u. Informatik
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-9747
Version:	Published version
Publication type:	Zeitschriftenaufsatz
Document type specification:	Scientific article
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	Communications materials 4
Pages or article number:	56
Publisher:	Springer Nature
Publisher place:	London
Issue date:	2023
ISSN:	2662-4443
Publisher DOI:	10.1038/s43246-023-00384-1
Appears in collections:	DFG-491381577-G