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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Bibliographic Details
Authors: 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
Format: article
Publication Date:2022
Country:España
Institution:Universitat Autònoma de Barcelona
Repository:Dipòsit Digital de Documents de la UAB
Language:English
OAI Identifier:oai:ddd.uab.cat:265204
Online Access:https://ddd.uab.cat/record/265204
https://dx.doi.org/urn:doi:10.1021/acsnano.2c04048
Access Level:Open access
Keyword:Slow magnetic relaxation
Single atom magnets
X-ray magnetic circular dichroism
Density functional theory
Perovskite oxides
Description
Summary: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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