Slow magnetic relaxation of Dy adatoms with in-plane magnetic anisotropy on a two-dimensional electron gas

0559633 - FZÚ 2023 RIV US eng J - Článek v odborném periodiku
Bellini, V. - Rusponi, S. - Kolorenč, Jindřich - Mahatha, S.K. - Valbuena, M.A. - Persichetti, L. - Pivetta, M. - Sorokin, B. - Merk, D. - Reynaud, S. - Sblendorio, D. - Stepanow, S. - Nistor, C. - Gargiani, P. - Betto, D. - Mugarza, A. - Gambardella, P. - Brune, H. - Carbone, C. - Barla, A.
Slow magnetic relaxation of Dy adatoms with in-plane magnetic anisotropy on a two-dimensional electron gas.
ACS Nano. Roč. 16, č. 7 (2022), s. 11182-11193. ISSN 1936-0851. E-ISSN 1936-086X
Grant ostatní: AV ČR(CZ) CNR-19-03
Program: Bilaterální spolupráce
Institucionální podpora: RVO:68378271
Klíčová slova: adsorption * magnetic properties * oxides * rare earths * electronic structure
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 17.1, rok: 2022
Způsob publikování: Open access

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. 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. 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.
Trvalý link: https://hdl.handle.net/11104/0337854