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Thermal and Magnetic-Field Stability of Holmium Single-Atom Magnets


Natterer, Fabian Donat; Donati, Fabio; Patthey, François; Brune, Harald (2018). Thermal and Magnetic-Field Stability of Holmium Single-Atom Magnets. Physical Review Letters, 121(2):027201.

Abstract

We use spin-polarized scanning tunneling microscopy to demonstrate that Ho atoms on magnesium oxide exhibit a coercive field of more than 8 T and magnetic bistability for many minutes, both at 35 K. The first spontaneous magnetization reversal events are recorded at 45 K, for which the metastable state relaxes in an external field of 8 T. The transverse magnetic anisotropy energy is estimated from magnetic field and bias voltage dependent switching rates at 4.3 K. Our measurements constrain the possible ground state of Ho single-atom magnets to either $J_z$=7 or 8, both compatible with magnetic bistability at fields larger than 10 mT.

Abstract

We use spin-polarized scanning tunneling microscopy to demonstrate that Ho atoms on magnesium oxide exhibit a coercive field of more than 8 T and magnetic bistability for many minutes, both at 35 K. The first spontaneous magnetization reversal events are recorded at 45 K, for which the metastable state relaxes in an external field of 8 T. The transverse magnetic anisotropy energy is estimated from magnetic field and bias voltage dependent switching rates at 4.3 K. Our measurements constrain the possible ground state of Ho single-atom magnets to either $J_z$=7 or 8, both compatible with magnetic bistability at fields larger than 10 mT.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > General Physics and Astronomy
Uncontrolled Keywords:General Physics and Astronomy
Language:English
Date:10 July 2018
Deposited On:07 Mar 2019 14:20
Last Modified:29 Jul 2020 10:16
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Green
Publisher DOI:https://doi.org/10.1103/physrevlett.121.027201
Project Information:
  • : FunderSNSF
  • : Grant IDPZ00P2_167965
  • : Project TitleSingle atom and molecule radio wave absorption spectroscopy

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