Unconventional Spin Relaxation Involving Localized Vibrational Modes in Ho Single-Atom Magnets

F. Donati; S. Rusponi; S. Stepanow; L. Persichetti; A. Singha; D. M. Juraschek; C. Wäckerlin; R. Baltic; M. Pivetta; K. Diller; C. Nistor; J. Dreiser; K. Kummer; E. Velez-Fort; N. A. Spaldin; H. Brune; P. Gambardella

doi:10.1103/PhysRevLett.124.077204

Unconventional Spin Relaxation Involving Localized Vibrational Modes in Ho Single-Atom Magnets

F. Donati, S. Rusponi, S. Stepanow, L. Persichetti, A. Singha, D. M. Juraschek, C. Wäckerlin, R. Baltic, M. Pivetta, K. Diller, C. Nistor, J. Dreiser, K. Kummer, E. Velez-Fort, N. A. Spaldin, H. Brune, P. Gambardella

Department of Physics

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

We investigate the spin relaxation of Ho single atom magnets on MgO/Ag(100) 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.

Original language	English
Article number	077204
Journal	Physical Review Letters
Volume	124
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevLett.124.077204
State	Published - 21 Feb 2020

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© 2020 American Physical Society.

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Donati, F., Rusponi, S., Stepanow, S., Persichetti, L., Singha, A., Juraschek, D. M., Wäckerlin, C., Baltic, R., Pivetta, M., Diller, K., Nistor, C., Dreiser, J., Kummer, K., Velez-Fort, E., Spaldin, N. A., Brune, H., & Gambardella, P. (2020). Unconventional Spin Relaxation Involving Localized Vibrational Modes in Ho Single-Atom Magnets. Physical Review Letters, 124(7), Article 077204. https://doi.org/10.1103/PhysRevLett.124.077204

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title = "Unconventional Spin Relaxation Involving Localized Vibrational Modes in Ho Single-Atom Magnets",

abstract = "We investigate the spin relaxation of Ho single atom magnets on MgO/Ag(100) 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.",

author = "F. Donati and S. Rusponi and S. Stepanow and L. Persichetti and A. Singha and Juraschek, {D. M.} and C. W{\"a}ckerlin and R. Baltic and M. Pivetta and K. Diller and C. Nistor and J. Dreiser and K. Kummer and E. Velez-Fort and Spaldin, {N. A.} and H. Brune and P. Gambardella",

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doi = "10.1103/PhysRevLett.124.077204",

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Donati, F, Rusponi, S, Stepanow, S, Persichetti, L, Singha, A, Juraschek, DM, Wäckerlin, C, Baltic, R, Pivetta, M, Diller, K, Nistor, C, Dreiser, J, Kummer, K, Velez-Fort, E, Spaldin, NA, Brune, H & Gambardella, P 2020, 'Unconventional Spin Relaxation Involving Localized Vibrational Modes in Ho Single-Atom Magnets', Physical Review Letters, vol. 124, no. 7, 077204. https://doi.org/10.1103/PhysRevLett.124.077204

TY - JOUR

T1 - Unconventional Spin Relaxation Involving Localized Vibrational Modes in Ho Single-Atom Magnets

AU - Donati, F.

AU - Rusponi, S.

AU - Stepanow, S.

AU - Persichetti, L.

AU - Singha, A.

AU - Juraschek, D. M.

AU - Wäckerlin, C.

AU - Baltic, R.

AU - Pivetta, M.

AU - Diller, K.

AU - Nistor, C.

AU - Dreiser, J.

AU - Kummer, K.

AU - Velez-Fort, E.

AU - Spaldin, N. A.

AU - Brune, H.

AU - Gambardella, P.

PY - 2020/2/21

Y1 - 2020/2/21

N2 - We investigate the spin relaxation of Ho single atom magnets on MgO/Ag(100) 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.

AB - We investigate the spin relaxation of Ho single atom magnets on MgO/Ag(100) 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.

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U2 - 10.1103/PhysRevLett.124.077204

DO - 10.1103/PhysRevLett.124.077204

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SN - 0031-9007

VL - 124

JO - Physical Review Letters

JF - Physical Review Letters

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ER -

Unconventional Spin Relaxation Involving Localized Vibrational Modes in Ho Single-Atom Magnets

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