Unconventional spin relaxation involving localized vibrational modes in Ho single-atom magnets

0533910 - FZÚ 2021 RIV US eng J - Článek v odborném periodiku
Donati, F. - Rusponi, S. - Stepanow, S. - Persichetti, L. - Singha, A. - Juraschek, D.M. - Wäckerlin, Christian - Baltic, R. - Pivetta, M. - Diller, K. - Nistor, C. - Dreiser, J. - Kummer, K. - Velez-Fort, E. - Spaldin, N.A. - Brune, H. - Gambardella, P.
Unconventional spin relaxation involving localized vibrational modes in Ho single-atom magnets.
Physical Review Letters. Roč. 124, č. 7 (2020), s. 1-6, č. článku 077204. ISSN 0031-9007. E-ISSN 1079-7114
Institucionální podpora: RVO:68378271
Klíčová slova: magnetism * single atom * XMCD * DFT
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 9.161, rok: 2020
Způsob publikování: Omezený přístup
https://doi.org/10.1103/PhysRevLett.124.077204

We investigate the spin relaxation of Ho single atom magnets on MgO=Agð100Þ as a function of temperature and magnetic field. We find that the spin relaxation is thermally activated at low field, while it remains larger than 1000 s up to 30 K and 8 T. This behavior contrasts with that of single molecule magnets and bulk paramagnetic impurities, which relax faster at high field.Combining our results with density functional theory, we rationalize this unconventional behavior by showing that local vibrations activate a two phonon Raman process with a relaxation rate that peaks near zero field and is suppressed at high field. Our work shows the importance of these excitations in the relaxation of axially coordinated magnetic atoms.
Trvalý link: http://hdl.handle.net/11104/0312138