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

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 properti...

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Detalles Bibliográficos
Autores: Bellini, Valerio, Rusponi, Stefano|||0000-0002-8494-5532, Kolorenč, Jindřich, Mahatha, Sanjoy K.|||0000-0002-5394-6911, Valbuena, Miguel Ángel|||0000-0002-0585-5636, Persichetti, Luca|||0000-0001-6578-254X, Pivetta, Marina|||0000-0001-5330-8648, Sorokin, Boris V.|||0000-0002-4950-5654, Merk, Darius, Reynaud, Sébastien, Sblendorio, Dante, Stepanow, Sebastian|||0000-0002-4090-6574, Nistor, Corneliu, Gargiani, Pierluigi|||0000-0002-6649-0538, Betto, Davide, Mugarza, Aitor|||0000-0002-2698-885X, Gambardella, Pietro|||0000-0003-0031-9217, Brune, Harald|||0000-0003-4459-3111, Carbone, Carlo|||0000-0002-8675-7850, Barla, Alessandro|||0000-0002-5632-4915
Tipo de recurso: artículo
Fecha de publicación:2022
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:265204
Acceso en línea:https://ddd.uab.cat/record/265204
https://dx.doi.org/urn:doi:10.1021/acsnano.2c04048
Access Level:acceso abierto
Palabra clave:Slow magnetic relaxation
Single atom magnets
X-ray magnetic circular dichroism
Density functional theory
Perovskite oxides
Descripción
Sumario: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.

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