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Slow Magnetic Relaxation of Dy Adatoms with In-Plane Magnetic Anisotropy on a Two-Dimensional Electron Gas

[Image: see text] We report on the magnetic properties of Dy atoms adsorbed on the (001) surface of SrTiO(3). 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 att...

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Autores principales: Bellini, Valerio, Rusponi, Stefano, Kolorenč, Jindřich, Mahatha, Sanjoy K., Valbuena, Miguel Angel, Persichetti, Luca, Pivetta, Marina, Sorokin, Boris V., Merk, Darius, Reynaud, Sébastien, Sblendorio, Dante, Stepanow, Sebastian, Nistor, Corneliu, Gargiani, Pierluigi, Betto, Davide, Mugarza, Aitor, Gambardella, Pietro, Brune, Harald, Carbone, Carlo, Barla, Alessandro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2022
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9330770/
https://www.ncbi.nlm.nih.gov/pubmed/35770912
http://dx.doi.org/10.1021/acsnano.2c04048
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author Bellini, Valerio
Rusponi, Stefano
Kolorenč, Jindřich
Mahatha, Sanjoy K.
Valbuena, Miguel Angel
Persichetti, Luca
Pivetta, Marina
Sorokin, Boris V.
Merk, Darius
Reynaud, Sébastien
Sblendorio, Dante
Stepanow, Sebastian
Nistor, Corneliu
Gargiani, Pierluigi
Betto, Davide
Mugarza, Aitor
Gambardella, Pietro
Brune, Harald
Carbone, Carlo
Barla, Alessandro
author_facet Bellini, Valerio
Rusponi, Stefano
Kolorenč, Jindřich
Mahatha, Sanjoy K.
Valbuena, Miguel Angel
Persichetti, Luca
Pivetta, Marina
Sorokin, Boris V.
Merk, Darius
Reynaud, Sébastien
Sblendorio, Dante
Stepanow, Sebastian
Nistor, Corneliu
Gargiani, Pierluigi
Betto, Davide
Mugarza, Aitor
Gambardella, Pietro
Brune, Harald
Carbone, Carlo
Barla, Alessandro
author_sort Bellini, Valerio
collection PubMed
description [Image: see text] We report on the magnetic properties of Dy atoms adsorbed on the (001) surface of SrTiO(3). 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(2)-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(3) crystal leads, regardless of the surface termination, to the formation of a spin-polarized two-dimensional electron gas of Ti 3d(xy) 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.
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spelling pubmed-93307702022-07-29 Slow Magnetic Relaxation of Dy Adatoms with In-Plane Magnetic Anisotropy on a Two-Dimensional Electron Gas Bellini, Valerio Rusponi, Stefano Kolorenč, Jindřich Mahatha, Sanjoy K. Valbuena, Miguel Angel Persichetti, Luca Pivetta, Marina Sorokin, Boris V. Merk, Darius Reynaud, Sébastien Sblendorio, Dante Stepanow, Sebastian Nistor, Corneliu Gargiani, Pierluigi Betto, Davide Mugarza, Aitor Gambardella, Pietro Brune, Harald Carbone, Carlo Barla, Alessandro ACS Nano [Image: see text] We report on the magnetic properties of Dy atoms adsorbed on the (001) surface of SrTiO(3). 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(2)-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(3) crystal leads, regardless of the surface termination, to the formation of a spin-polarized two-dimensional electron gas of Ti 3d(xy) 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. American Chemical Society 2022-06-30 2022-07-26 /pmc/articles/PMC9330770/ /pubmed/35770912 http://dx.doi.org/10.1021/acsnano.2c04048 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Bellini, Valerio
Rusponi, Stefano
Kolorenč, Jindřich
Mahatha, Sanjoy K.
Valbuena, Miguel Angel
Persichetti, Luca
Pivetta, Marina
Sorokin, Boris V.
Merk, Darius
Reynaud, Sébastien
Sblendorio, Dante
Stepanow, Sebastian
Nistor, Corneliu
Gargiani, Pierluigi
Betto, Davide
Mugarza, Aitor
Gambardella, Pietro
Brune, Harald
Carbone, Carlo
Barla, Alessandro
Slow Magnetic Relaxation of Dy Adatoms with In-Plane Magnetic Anisotropy on a Two-Dimensional Electron Gas
title Slow Magnetic Relaxation of Dy Adatoms with In-Plane Magnetic Anisotropy on a Two-Dimensional Electron Gas
title_full Slow Magnetic Relaxation of Dy Adatoms with In-Plane Magnetic Anisotropy on a Two-Dimensional Electron Gas
title_fullStr Slow Magnetic Relaxation of Dy Adatoms with In-Plane Magnetic Anisotropy on a Two-Dimensional Electron Gas
title_full_unstemmed Slow Magnetic Relaxation of Dy Adatoms with In-Plane Magnetic Anisotropy on a Two-Dimensional Electron Gas
title_short Slow Magnetic Relaxation of Dy Adatoms with In-Plane Magnetic Anisotropy on a Two-Dimensional Electron Gas
title_sort slow magnetic relaxation of dy adatoms with in-plane magnetic anisotropy on a two-dimensional electron gas
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9330770/
https://www.ncbi.nlm.nih.gov/pubmed/35770912
http://dx.doi.org/10.1021/acsnano.2c04048
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