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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 84: Focus Session: Spins on Surfaces II (joint session O/MA)

O 84.1: Hauptvortrag

Donnerstag, 4. April 2019, 15:00–15:30, H15

Long-lived magnetic states in atomic-scale magnets — •Sebastian Stepanow — ETH Zürich, Switzerland

Magnetic atoms on surfaces are emerging as a new class of systems with exceptionally long spin relaxation times, which allows for reading and writing magnetic bits on the atomic scale. The magnetic properties of the single-ion magnets depend crucially on their atomic environment and enhancing their spin dynamics may lead to the development of single-atom qubits. Recent observations of magnetic remanence in individual Ho atoms adsorbed on ultrathin MgO(100) layers on Ag(100) provided the first evidence of a single atom magnet on a surface. The opening of the hysteresis loop indicates that the lifetime of Ho atoms is on the order of hours at cryogenic temperatures. Meanwhile more rare-earth adatom systems have been identified having exceptionally long spin relaxation time T1. Despite the raising interest in these systems, it is still not clear which factors determine their very long relaxation time and if a long coherence time can be expected. The talk highlights our recent efforts in the understanding of the different contributing factors, i.e., the strong uniaxial magnetic anisotropy, the symmetry protection of the ground state from quantum tunneling and other first order scattering processes, and the peculiarities of the spin-phonon coupling with the supporting substrate.

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