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journal article·2022-07-26Open access

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

Valerio Bellini, Stefano Rusponi, Jindřich Kolorenč, Sanjoy K. Mahatha, Miguel Angel Valbuena, Luca Persichetti, Marina Pivetta, Boris V. Sorokin, Darius Merk, Sébastien Reynaud, Dante Sblendorio, Sebastian Stepanow, Corneliu Nistor, Pierluigi Gargiani, Davide Betto, Aitor Mugarza, Pietro Gambardella, Harald Brune, Carlo Carbone, Alessandro Barla

ACS Nano· Volume 16· Issue 7
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Source abstract

Abstract

We report on the magnetic properties of Dy atoms adsorbed on the (001) surface of SrTiO3. 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 TiO2-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 SrTiO3 crystal leads, regardless of the surface termination, to the formation of a spin-polarized two-dimensional electron gas of Ti 3dxy 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.
Source: europepmc · Quality: candidate unverified · Source record ↗

Research context

OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Advanced Condensed Matter Physics · Electronic and Structural Properties of Oxides

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

S3-Istituto di Nanoscienze-CNR, Via Campi 213/A, I-41125 Modena, Italy

Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland

Institute of Physics (FZU), Czech Academy of Sciences, Na Slovance 2, CZ-182 21 Prague, Czech Republic

Istituto di Struttura della Materia (ISM), Consiglio Nazionale delle Ricerche (CNR), I-34149 Trieste, Italy

School of Physics and Materials Science, Thapar Institute of Engineering and Technology, Patiala 147004, India

Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, E-08193 Barcelona, Spain

Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA Nanoscience), E-28049 Madrid, Spain

Department of Materials, ETH Zurich, CH-8093 Zurich, Switzerland

Dipartimento di Fisica, Università di Roma “Tor Vergata”, I-00133 Roma, Italy

ALBA Synchrotron Light Source, E-08290 Cerdanyola del Vallès, Spain

European Synchrotron Radiation Facility, F-38043 Grenoble Cedex, France

Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona E-08010, Spain

Funding

Schweizerischer Nationalfonds zur F??rderung der Wissenschaftlichen Forschung · Ministerio de Econom??a y Competitividad · Consiglio Nazionale delle Ricerche · Generalitat de Catalunya · Akademie V?d ?esk?? Republiky

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