Spin waves in ultrathin ferromagnetic overlayers

Barbosa, L. H. M.; Muniz, R. B.; Costa, A. T.; Mathon, J.

doi:10.1103/physrevb.63.174401

Cited by 21 publications

(19 citation statements)

References 18 publications

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“…With the first-principles calculations and non-equilibrium Green's function (NEGF) theory, the transmission currents under some bias voltages are obtained. Furthermore, the spin waves in zigzag GNR have been studied with the spin transverse dynamic susceptibility theory [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Excited spin density waves in zigzag graphene nanoribbons

2018

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In addition to the well-known anti-ferromagnetic and ferromagnetic edge states in zigzag graphene nanoribbons (GNR), we find that there also exist some excited spin density wave (ESDW) states, the energies of which are close to the anti-ferromagnetic state (ground state). We thus argue that these ESDW states may coexist in experiment. Our numerical results from the self-consistent mean-field method as well as the first-principles calculations indicate that the allowed ESDWs are commensurate; and their dispersion curves are linear in the long wave limit. The coupling of the two edge portions in an ESDW becomes very weak in a wide GNR, in which case these ESDW portions may have different phases. Finally our calculations in the non-equilibrium Green's function theory combined with the Hubbard model show that these ESDW states can also exist in some localized (middle or terminal) region of GNR.

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Section: Introductionmentioning

confidence: 99%

Excited spin density waves in zigzag graphene nanoribbons

2018

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“…Mean field theory is used to describe the ground state of the system, considering an effective intra-atomic Coulomb interaction within the d shells of both the ferromagnetic and heavy metal layers. The ground-state magnetization of the ferromagnetic layer is calculated self-consistently, assuming a fixed value of the Fermi energy and adjusting the atomic d -orbital energy levels to reproduce the electronic occupancy obtained by the RS-LMTO-ASA calculations for each layer 51 . At the end of this process the atomic planes of the non-magnetic substrate close to ferromagnetic layer become also slightly spin polarized due to the proximity effect.…”

Section: Methodsmentioning

confidence: 99%

Dynamical amplification of magnetoresistances and Hall currents up to the THz regime

Guimarães

Dias

Bouaziz

et al. 2017

Sci Rep

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Spin-orbit-related effects offer a highly promising route for reading and writing information in magnetic units of future devices. These phenomena rely not only on the static magnetization orientation but also on its dynamics to achieve fast switchings that can reach the THz range. In this work, we consider Co/Pt and Fe/W bilayers to show that accounting for the phase difference between different processes is crucial to the correct description of the dynamical currents. By tuning each system towards its ferromagnetic resonance, we reveal that dynamical spin Hall angles can non-trivially change sign and be boosted by over 500%, reaching giant values. We demonstrate that charge and spin pumping mechanisms can greatly magnify or dwindle the currents flowing through the system, influencing all kinds of magnetoresistive and Hall effects, thus impacting also dc and second harmonic experimental measurements.

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“…[6][7][8] However, due to neglect of the strong correlation effects in itinerant ferromagnets, RPA is well known to overestimate the spin-wave energy, spin stiffness, and Curie temperature, etc., as explicitly demonstrated in recent theoretical investigations by incorporating correlation effects beyond RPA. 9,10 Indeed, signature of inherent many-body effects have been found in recent SPEELS ͑Ref.…”

Section: Introductionmentioning

confidence: 99%

Spin-charge coupling in a band ferromagnet: Magnon-energy reduction, anomalous softening, and damping

Pandey

Singh

2008

Phys. Rev. B

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The effects of correlation-induced coupling between spin and charge fluctuations on spin-wave excitations in a band ferromagnet are investigated by including self-energy and vertex corrections within a systematic inverse-degeneracy expansion scheme which explicitly preserves the Goldstone mode. Arising from the scattering of a magnon into intermediate spin-excitation states ͑including both magnon and Stoner excitations͒ accompanied with charge fluctuations in the majority-spin band, this spin-charge coupling results not only in a substantial reduction of magnon energies but also in anomalous softening and significant magnon damping for zone-boundary modes lying within the Stoner gap. Our results are in good qualitative agreement with recent spin-wave excitation measurements in colossal magnetoresistive manganites and ferromagnetic ultrathin films of transition metals.

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Spin waves in ultrathin ferromagnetic overlayers

Cited by 21 publications

References 18 publications

Excited spin density waves in zigzag graphene nanoribbons

Excited spin density waves in zigzag graphene nanoribbons

Dynamical amplification of magnetoresistances and Hall currents up to the THz regime

Spin-charge coupling in a band ferromagnet: Magnon-energy reduction, anomalous softening, and damping

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