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MA: Fachverband Magnetismus
MA 19: Surface Magnetism
MA 19.6: Vortrag
Dienstag, 19. März 2024, 10:45–11:00, EB 407
The Impact of Lattice Distortions on the Magnetic Stability of Single Atoms: Dy and Ho on BaO(100) — Boris V. Sorokin1, Marina Pivetta1, Valerio Bellini2, Darius Merk1, Sébastien Reynaud1, •Alessandro Barla3, Harald Brune1, and Stefano Rusponi1 — 1Institute of Physics, EPFL, CH-1015 Lausanne, Switzerland — 2S3-Istituto di Nanoscienze-CNR, I-41125 Modena, Italy — 3Istituto di Struttura della Materia, CNR, Trieste, Italy
With a view to the operation as qubits and memories of surface-adsorbed single-atom magnets, there is currently a strong focus on understanding the factors determining their spin dynamics. We present our investigations of the magnetic properties of Dy and Ho atoms adsorbed on BaO(100) thin films on Pt(100) [1] and a comparison with previous results for the same two elements on MgO/Ag(100). On BaO(100), Dy shows hysteresis in magnetic fields up to ≈ 3.5 T and long spin lifetime, exceeding 300 s at 2.5 K and 0.5 T. Surprisingly, Ho shows paramagnetism, as opposed to its long spin lifetime on MgO. Our combined experimental and theoretical approach shows that the critical differences bewteen BaO(100) and MgO(100) originate from the local surface distortions induced by the adatoms: while on MgO minimal distortions involve only the closest O atoms, on BaO they affect both the closest anions and cations.
[1] B. V. Sorokin, M. Pivetta, V. Bellini, D. Merk, S. Reynaud, A. Barla, H. Brune, and S. Rusponi, Adv. Funct. Mater. 33, 2213951 (2023).
Keywords: Single-atom magnets; X-ray magnetic circular dichroism; Atomic multiplet simulations; Density-functional theory