Slow Magnetic Relaxation of Dy Adatoms with In-Plane Magnetic Anisotropy on a Two-Dimensional Electron Gas
Bellini, Valerio (Istituto di Nanoscienze-CNR)
Rusponi, Stefano (École Polytechnique Fédérale de Lausanne. Institute of Physics)
Kolorenč, Jindřich (Czech Academy of Sciences. Institute of Physics)
Mahatha, Sanjoy K. (Thapar Institute of Engineering and Technology)
Valbuena, Miguel Ángel (Institut Català de Nanociència i Nanotecnologia)
Persichetti, Luca (Università di Roma "Tor Vergata")
Pivetta, Marina (École Polytechnique Fédérale de Lausanne. Institute of Physics)
Sorokin, Boris V. (École Polytechnique Fédérale de Lausanne. Institute of Physics)
Merk, Darius (École Polytechnique Fédérale de Lausanne. Institute of Physics)
Reynaud, Sébastien (École Polytechnique Fédérale de Lausanne. Institute of Physics)
Sblendorio, Dante (École Polytechnique Fédérale de Lausanne. Institute of Physics)
Stepanow, Sebastian (ETH Zürich)
Nistor, Corneliu (ETH Zürich)
Gargiani, Pierluigi (ALBA Laboratori de Llum de Sincrotró)
Betto, Davide (European Synchrotron Radiation Facility)
Mugarza, Aitor (Institut Català de Nanociència i Nanotecnologia)
Gambardella, Pietro (ETH Zürich)
Brune, Harald (École Polytechnique Fédérale de Lausanne. Institute of Physics)
Carbone, Carlo (Consiglio Nazionale delle Ricerche. Istituto di Struttura della Materia)
Barla, Alessandro (Consiglio Nazionale delle Ricerche. Istituto di Struttura della Materia)

Fecha:	2022
Resumen:	We report on the magnetic properties of Dy atoms adsorbed on the (001) surface of SrTiO. X-ray magnetic circular dichroism reveals slow relaxation of the Dy magnetization on a time scale of about 800 s at 2. 5 K, unusually associated with an easy-plane magnetic anisotropy. We attribute these properties to Dy atoms occupying hollow adsorption sites on the TiO-terminated surface. Conversely, Ho atoms adsorbed on the same surface show paramagnetic behavior down to 2. 5 K. With the help of atomic multiplet simulations and first-principles calculations, we establish that Dy populates also the top-O and bridge sites on the coexisting SrO-terminated surface. A simple magnetization relaxation model predicts these two sites to have an even longer magnetization lifetime than the hollow site. Moreover, the adsorption of Dy on the insulating SrTiO crystal leads, regardless of the surface termination, to the formation of a spin-polarized two-dimensional electron gas of Ti 3d character, together with an antiferromagnetic Dy-Ti coupling. Our findings support the feasibility of tuning the magnetic properties of the rare-earth atoms by acting on the substrate electronic gas with electric fields.
Ayudas:	Ministerio de Ciencia e Innovación SEV-2017-0706 Ministerio de Economía y Competitividad SEV-2016-0686 Agencia Estatal de Investigación PID2019-107338RB-C65
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Slow magnetic relaxation ; Single atom magnets ; X-ray magnetic circular dichroism ; Density functional theory ; Perovskite oxides
Publicado en:	ACS nano, Vol. 16, Issue 7 (June 2022) , p. 11182-11193, ISSN 1936-086X

DOI: 10.1021/acsnano.2c04048
PMID: 35770912

12 p, 5.1 MB

El registro aparece en las colecciones:
Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > Institut Català de Nanociència i Nanotecnologia (ICN2)
Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > El Sincrotrón ALBA
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