Surface Spin Waves in Antiferromagnetic NiO

Wames, R. E. De; Wolfram, T.

doi:10.1103/physrevlett.22.137

Cited by 31 publications

(2 citation statements)

References 4 publications

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“…The ability and utility of LEED to investigate the surface AFM order were first demonstrated by Palmberg et al [33] for the case of NiO(001) single-crystal surface, more than 50 years ago. There have been a few further studies following this [34][35][36][37], where this method has been used for the estimation of the surface Néel temperatures. However, despite its suitability for the investigation of the surface AFM order, this method has not been popular, possibly owing to technical difficulties and inherent limitations.…”

Section: Introductionmentioning

confidence: 99%

Magnetic coupling across the antiferromagnetic–antiferromagnetic interface

Jena¹,

Kar²,

Barman³

et al. 2021

J. Phys. D: Appl. Phys.

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We investigate the magnetic coupling across the antiferromagnetic–antiferromagnetic (AFM–AFM) interface for the prototypical CoO-NiO bilayer system where the bulk Néel temperature (T N ) of NiO is higher than that of CoO. Using the temperature-dependent exchange-scattered electron intensities from the surface AFM lattice, the surface T N of CoO was estimated as a function of the CoO/NiO film thicknesses. Our results show that the surface T N of CoO layers is enhanced significantly from its bulk T N value and approaching the T N of the NiO layers, as the thickness of the CoO layers is reduced to the monolayer limit. Thus, thinner CoO layers are found to have higher T N than thicker layers on NiO, contrasting with the expected finite-size behavior. In addition to the short-range magnetic exchange coupling at the CoO-NiO interface, we observe the existence of a longer-range magnetic coupling across the interface, mediated by the magnetic correlations. Thus, the magnetic proximity effect is attributed to a combination of a short-range and a weaker long-range magnetic coupling, explaining the long AFM order propagation length in AFM–AFM superlattices and bilayers. Further, our results indicate a new approach to tune the AFM Néel temperature by varying the individual layer thickness of the bilayer system through the magnetic proximity effect.

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Section: Introductionmentioning

confidence: 99%

Magnetic coupling across the antiferromagnetic–antiferromagnetic interface

Jena¹,

Kar²,

Barman³

et al. 2021

J. Phys. D: Appl. Phys.

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“…At such a low frequency, one could expect a nearly adiabatic response, with very little mechanical energy transferred from the tip to some low-frequency excitations such as magnons, or perhaps phonons. Antiferromagnetic magnons, the first obvious choice, are immediately ruled out since, owing to strong dipolar anisotropy, the antiferromagnetic spin-wave dispersion of NiO has a bulk gap ∆ ∼ 1.5 meV ∼ 0.36 THz [4], and one at least as large at the surface [5][6][7]. As a result, the oscillatory perturbation exerted on the surface spin is completely adiabatic -ω tip ≪ ∆ by more than 6 orders of magnitude -and direct dissipation in the spin-wave channel vanishes.…”

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confidence: 99%

Atomic Spin-Sensitive Dissipation on Magnetic Surfaces

2010

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We identify the mechanism of energy dissipation relevant to spin-sensitive nanomechanics including the recently introduced magnetic exchange force microscopy, where oscillating magnetic tips approach surface atomic spins. The tip-surface exchange couples spin and atom coordinates, leading to a spin-phonon problem with Caldeira-Leggett-type dissipation. In the overdamped regime, that can lead to a hysteretic flip of the local spin with a large spin-dependent dissipation, even down to the very low experimental tip oscillation frequencies, describing recent observations for Fe tips on NiO. A phase transition to an underdamped regime with dramatic drop of magnetic tip dissipation should in principle be possible by tuning tip-surface distance.

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Spinpolarisierte Photoelektronen aus EuO

Sattler

Siegmann

1975

Z Physik B

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Surface Spin Waves in Antiferromagnetic NiO

Cited by 31 publications

References 4 publications

Magnetic coupling across the antiferromagnetic–antiferromagnetic interface

Magnetic coupling across the antiferromagnetic–antiferromagnetic interface

Atomic Spin-Sensitive Dissipation on Magnetic Surfaces

Spinpolarisierte Photoelektronen aus EuO

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