Quantum state manipulation of single atom magnets using the hyperfine interaction

Forrester, Patrick; Patthey, F.; Fernandes, Edgar; Sblendorio, Dante; Brune, Harald; Natterer, Fabian Donat

doi:10.1103/physrevb.100.180405

Cited by 27 publications

(30 citation statements)

References 34 publications

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“…Note that we never observe any spin-switching in Dy over days against repeated cycles of B ext ramps within ± 30 mT (see Supplementary section 3), despite an isotopic composition which bears the possibility of spin-flip transitions at low magnetic fields via hyperfine interaction in 161 Dy (19% natural abundance) and 163 Dy (25% natural abundance). This is in contrast to the case of single Ho atoms on MgO, where spin-switching was observed at slow magnetic field sweeps 16 . Moreover, the magnetic state of the Dy atom is also stable against high magnetic fields of 5 T and heating of at least up to 15 K (Fig.…”

Section: Figure 1 a Shows A Constant Current Stm Image Highlighting Bothcontrasting

confidence: 72%

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Engineering atomic-scale magnetic fields by dysprosium single atom magnets

et al. 2021

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Atomic scale engineering of magnetic fields is a key ingredient for miniaturizing quantum devices and precision control of quantum systems. This requires a unique combination of magnetic stability and spin-manipulation capabilities. Surface-supported single atom magnets offer such possibilities, where long temporal and thermal stability of the magnetic states can be achieved by maximizing the magnet/ic anisotropy energy (MAE) and by minimizing quantum tunnelling of the magnetization. Here, we show that dysprosium (Dy) atoms on magnesium oxide (MgO) have a giant MAE of 250 meV, currently the highest among all surface spins. Using a variety of scanning tunnelling microscopy (STM) techniques including single atom electron spin resonance (ESR), we confirm no spontaneous spin-switching in Dy over days at ≈ 1 K under low and even vanishing magnetic field. We utilize these robust Dy single atom magnets to engineer magnetic nanostructures, demonstrating unique control of magnetic fields with atomic scale tunability.

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Section: Figure 1 a Shows A Constant Current Stm Image Highlighting Bothcontrasting

confidence: 72%

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confidence: 99%

Engineering atomic-scale magnetic fields by dysprosium single atom magnets

et al. 2021

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“…Note that we never observe any spin-switching in Dy over days against repeated cycles of B ext ramps within ±30 mT (see Supplementary section 3), despite an isotopic composition which bears the possibility of spin-flip transitions at low magnetic fields via hyperfine interaction in 161 Dy (19% natural abundance) and 163 Dy (25% natural abundance). This is in contrast to the case of single Ho atoms on MgO, where spin-switching was observed at slow magnetic field sweeps 14 .…”

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confidence: 72%

“…In particular, Dy ions and diatomic units deposited on MgO are predicted to possess significantly larger MAE compared to their counterparts containing Ho 12 . Additionally, the seminal single-atom magnet, Ho on MgO 1 , despite its long magnetic lifetime, lacks resilience against slow sweep rates of tip-magnetic fields 14 . Here, we report the first single-atom magnet on a surface that maintains stability at zero external magnetic field as well as against slow magnetic field sweeps, and hence can be used to create atomically localized magnetic fields.…”

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confidence: 99%

Engineering atomic-scale magnetic fields by dysprosium single atom magnets

Singha

Willke

Bilgeri

et al. 2021

Preprint

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Atomic scale engineering of magnetic fields is a key ingredient for miniaturizing quantum devices and precision control of quantum systems. This requires a unique combination of magnetic stability and spin-manipulation capabilities. Surface-supported single atom magnets offer such possibilities, where long temporal and thermal stability of the magnetic states can be achieved by maximizing the magnetic anisotropy energy (MAE) and by minimizing quantum tunnelling of the magnetization. Here, we show that dysprosium (Dy) atoms on magnesium oxide (MgO) have a giant MAE of 250 meV, currently the highest among all surface spins. Using a variety of scanning tunnelling microscopy (STM) techniques including single atom electron spin resonance (ESR), we confirm no spontaneous spin-switching in Dy over days at ~1 K under low and even vanishing magnetic field. We utilize these robust Dy single atom magnets to engineer magnetic nanostructures, demonstrating unique control of magnetic fields with atomic scale tunability.

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“…The linewidth of the spin-flip transition is broadened by the finite lifetime of the vibrational mode [41] as well as by the spread in energy of the Ho nuclear states due to the hyperfine interaction [33,43,44]. By modeling the low-field and high-temperature data of Fig.…”

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confidence: 99%

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

et al. 2020

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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 twophonon 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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Quantum state manipulation of single atom magnets using the hyperfine interaction

Cited by 27 publications

References 34 publications

Engineering atomic-scale magnetic fields by dysprosium single atom magnets

Engineering atomic-scale magnetic fields by dysprosium single atom magnets

Engineering atomic-scale magnetic fields by dysprosium single atom magnets

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

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