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Understanding magnetic relaxation in single-ion magnets with high blocking temperature

A. Chiesa1,2, F. Cugini1, R. Hussain1,3, E. Macaluso1, G. Allodi1, E. Garlatti1,2, M. Giansiracusa4, C. A. P. Goodwin4, F. Ortu4 et al.

D. Reta4, J. M. Skelton4, T. Guidi5, P. Santini1,2, M. Solzi1, R. De Renzi1, D. P. Mills4,*, N. F. Chilton4,†, and S. Carretta1,2,‡

  • 1Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, I-43124 Parma, Italy
  • 2UdR Parma, INSTM, I-43124 Parma, Italy
  • 3Dipartimento di Fisica, Università di Pavia, Pavia, Italy
  • 4Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
  • 5ISIS Facility, Rutherford Appleton Laboratory, OX11 0QX Didcot, United Kingdom

  • *david.mills@manchester.ac.uk
  • †nicholas.chilton@manchester.ac.uk
  • ‡stefano.carretta@unipr.it
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Phys. Rev. B 101, 174402 – Published 4 May, 2020

DOI: https://doi.org/10.1103/PhysRevB.101.174402

Abstract

The recent discovery of single-ion magnets with magnetic hysteresis above liquid-nitrogen temperatures placed these compounds among the best candidates to realize high-density storage devices. Starting from a prototypical dysprosocenium molecule, showing hysteresis up to 60 K, we derive here a general recipe to design high-blocking-temperature rare-earth single-ion magnets. The complex magnetic relaxation is unraveled by combining magnetization and nuclear magnetic resonance measurements with inelastic neutron scattering experiments and ab initio calculations, thus disentangling the different mechanisms and identifying the key ingredients behind slow relaxation.

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Phys. Rev. B 101, 174402– Published 4 May, 2020
  • Received 28 November 2019
  • Accepted 16 March 2020
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