Magnetic remanence in single atoms

F. Donati, S. Rusponi, S. Stepanow, C. Wäckerlin, A. Singha, L. Persichetti, R. Baltic, K. Diller, F. Patthey, E. Fernandes, J. Dreiser, Šljivančanin, K. Kummer, C. Nistor, P. Gambardella, H. Brune

Research output: Contribution to journalArticlepeer-review

210 Scopus citations

Abstract

A permanent magnet retains a substantial fraction of its saturation magnetization in the absence of an external magnetic field. Realizing magnetic remanence in a single atom allows for storing and processing information in the smallest unit of matter. We show that individual holmium (Ho) atoms adsorbed on ultrathin MgO(100) layers on Ag(100) exhibit magnetic remanence up to a temperature of 30 kelvin and a relaxation time of 1500 seconds at 10 kelvin. This extraordinary stability is achieved by the realization of a symmetry-protected magnetic ground state and by decoupling the Ho spin from the underlying metal by a tunnel barrier.

Original languageEnglish
Pages (from-to)318-321
Number of pages4
JournalScience
Volume352
Issue number6283
DOIs
StatePublished - 15 Apr 2016

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