- Strong Spin-Phonon Coupling in Two-Dimensional Magnetic Semiconductor.
- Spin-phonon coupling in frustrated magnet CdCr2 O4.
- Inter-Kramers Transitions and Spin Phonon Couplings in a Lanthanide.
- Evidence of spin-phonon coupling in CrSiTe3 - Semantic Scholar.
- Spin‐phonon coupling and two‐magnons scattering behaviors in.
- Polariton - Wikipedia.
- Spin-phonon coupling in multiferroic Y2CoMnO6 - ScienceDirect.
- Spin-phonon coupling in NiO nanoparticle - AIP Publishing.
- Spin-induced negative thermal expansion and.
- Spin-Phonon Coupling in Ferromagnetic Monolayer Chromium Tribromide.
- PDF Spin-phonon coupling in antiferromagnetic nickel oxide.
- (PDF) Strong spin-phonon coupling unveiled by coherent phonon.
- [PDF] Electron-phonon and spin-phonon coupling in NaV2O5.
- The manifestation of spin-phonon coupling in CaMnO{sub 3}.
Strong Spin-Phonon Coupling in Two-Dimensional Magnetic Semiconductor.
Spin-phonon coupling effects, as reflected in phonon frequency shifts between ferromagnetic (FM) and G-type antiferromagnetic (AFM) configurations in cubic CaMnO 3, SrMnO 3, BaMnO 3, LaCrO 3, LaFeO 3, and La 2 (CrFe)O 6, are investigated using density-functional methods.The calculations are carried out both with a hybrid-functional Heyd-Scuseria-Ernzerhof (HSE) approach and with a DFT + U. Spin-phonon coupling is an interesting phenomena, especially, in the case of multiferroic materials. Its origin is said to be the exchange interaction of magnetic ions. In that case, any magnetic materials should have significant spin-phonon coupling. But we never see this phenomena in all magnetic materials. Gigahertz-frequency mechanical waves directly drive spin transitions in nitrogen-vacancy centers, offering a new way to control spins, sense strains, and study spin-phonon interactions at the nanoscale. Many developing technologies based on quantum spins rely on magnetic fields to control the spins. As spin-based quantum technologies evolve.
Spin-phonon coupling in frustrated magnet CdCr2 O4.
Spin-phonon coupling originated from spin-lattice correlation depends upon different exchange interactions in transition metal oxides containing 3d magnetic ions. Spin-lattice coupling can influence the coupling mechanism in magnetoelectric material. To understand the spin-lattice correlation in inverse trirutile Fe 2 TeO 6 (FTO), magnetic properties and phonon spectra are studied. The well-defined Raman peaks of TO (Δ) and LO (Δ) allow us to study the spin-phonon coupling effect in NiO. It is found that spin-phonon coupling is responsible for the Raman scattering anomalies, namely, the relatively large Raman shift hardening and peak width narrowing below the Néel temperature for LO and its overtone 2LO phonons.
Inter-Kramers Transitions and Spin Phonon Couplings in a Lanthanide.
Recently, spin-phonon coupling (SPC) has gained considerable attention especially in two-dimensional (2D) materials. Herein, density-functional theory is used to investigate the SPC effect in CrSBr, a recently fabricated 2D magnetic semiconductor. It is found that the phonon vibrations are strongly dependent on the spin ordering. The breaking of magnetic symmetry changes phonon spectrum. The spin–phonon coupling is associated with the modification of the magnetic exchange interactions caused by the ionic motions, and the relevant phonon frequency shifts can be expressed as. In this talk we present our recent work regarding magnon-phonon coupling. We briefly introduce the mechanism of acoustic spin pumping [1] and demonstrate a spin to charge current conversion via magnon-phonon coupling and inverse Edelstein effect [2]. We further show that.
Evidence of spin-phonon coupling in CrSiTe3 - Semantic Scholar.
The coupling between electronic spins and lattice vibrations is fundamental for driving relaxation in magnetic materials. The debate over the nature of spin-phonon coupling dates back to the 1940s, but the role of spin-spin, spin-orbit, and hyperfine interactions has never been fully established. We propose that the spin-phonon coupling mediated by the Fe-O2-Fe interbilayer exchange play a significant role in magnetoelectric ME coupling observed in the material. HSE functional for our studies of the spin-phonon coupling; indeed, as we will see in Sec. IIIB, the HSE-calculated phonon modes agree well with available experimental results. From these observations, we can conclude that spin-phonon coupling is present only in R CrO 3 with magnetic R3+ ions. Fig. 5: (Color online) Effect of the temperature on B 1g (4) and A g (4) phonon linewidths in R CrO 3 ( R = Y, Lu, Gd, Eu and Sm). Solid lines are guides to the eye.
Spin‐phonon coupling and two‐magnons scattering behaviors in.
Important factor, not figuring in the electron-phonon coupling, is the effect of spin fluctuations. Unlike the electron-phonon coupling, electron-spin-fluctuation (ES) interactions or the electron-paramagnon coupling has a deleterious effect on the spin singlet superconductivity [6, 15], as they lead to breaking of the Cooper pairs.
Polariton - Wikipedia.
Based on the recent observation of spin-phonon coupling in the osmium oxide, the team found that the coupling was the strongest ever observed. The strong spin-phonon coupling may be caused by the.
Spin-phonon coupling in multiferroic Y2CoMnO6 - ScienceDirect.
Periodic DFT calculations give energies and symmetries of the phonons. Vibronic-coupling calculations have been performed to understand the behavior of the coupled peaks in the Raman spectra. Current work demonstrates that spin-phonon couplings may be probed by a combination of Raman, far-IR and INS spectroscopies. The observed behavior is consistent with the presence of the previously reported short-range magnetic order and strong spin-phonon coupling. We present Raman scattering results on the layered semiconducting ferromagnetic compound ${\mathrm{CrSiTe}}_{3}$. Four Raman-active modes, predicted by symmetry, are observed and assigned.
Spin-phonon coupling in NiO nanoparticle - AIP Publishing.
Here we consider such a material, the 5dperovskite NaOsO3, and observe a coupling between spin and phonon manifested in a frequency shift of 40 cm−1, the largest measured in any material. The anomalous modes are shown to involve solely Os–O interactions and magnetism is revealed as the driving microscopic mechanism for the phonon renormalization. We report magnetization and Raman spectroscopy study on single crystals of VOCl, a van der Waals antiferromagnetic material. Magnetization measurement confirms an antiferromagnetic transition at 79 K and a magnetic easy axis along crystallographic a direction. The temperature-dependent Raman spectrum reveals five peaks at 30 K. Below the Neel temperature T<SUB>N</SUB>, the Raman-active modes. However, lattice dynamics, chirality of phonons, and spin-phonon coupling in this material, which set the foundation for these exotic phenomena, have remained unexplored. Here, the first experimental investigation of the phonons and mutual interactions between spin and lattice degrees of freedom in few-layer Fe 3 GeTe 2 is reported.
Spin-induced negative thermal expansion and.
In the current work, we show for the first time spin-phonon couplings between Kramers doublets (KDs, from the crystal filed) in the lanthanide-based SMM Er[N(SiMe 3) 2] 3 (1) and its IR-active phonons, which are observed as avoided crossings in magneto-far-IR spectra with coupling constants approximately equal} 3 cm-1. In one case, the magnetic.
Spin-Phonon Coupling in Ferromagnetic Monolayer Chromium Tribromide.
The peculiarities of the spin-phonon coupling are consistent with the trends given by density functional theory. The obtained results shed light on the nature of the spin-phonon coupling in antiferromagnetic insulators and can help in developing spintronic devices. The work at UC Riverside was supported as part of the Spins and Heat in. Nanoelectromechanical. Emerging computing device applications. In these compounds, spin-phonon coupling (SPC) typically plays a crucial role in magnetic fluctuations, magnon dissipation, and ultimately establishing long-range ferromagnetic order. How-ever, a systematic understanding of SPC in 2D magnets that combines theory and experiment is still lacking.
PDF Spin-phonon coupling in antiferromagnetic nickel oxide.
The observed behavior is consistent with the presence of the previously reported short-range magnetic order and the strong spin-phonon coupling. Subjects: Materials Science () ; Strongly Correlated Electrons (). The infrared phonon spectrum of the spinel CdCr2 O4 is measured as a function of temperature from 6 to 300 K. The triply degenerate Cr phonons soften in the paramagnetic phase as temperature is lowered below 100 K and then split into a singlet and doublet in the low temperature antiferromagnetic phase, which is tetragonally distorted to relieve the geometric frustration in the pyrochlore. Spin-phonon coupling effects, as reflected in phonon frequency shifts between ferromagnetic (FM) and G-type antiferromagnetic (AFM) configurations in cubic CaMnO 3,SrMnO 3,BaMnO 3,LaCrO 3, LaFeO 3,and La 2(CrFe)O 6, are investigated using density-functional methods. The calculations are carried out both with a.
(PDF) Strong spin-phonon coupling unveiled by coherent phonon.
Dispersion relation of phonon polaritons in GaP. Red curves are the uncoupled phonon and photon dispersion relations, black curves are the result of coupling (from top to bottom: upper polariton, LO phonon, lower polariton).... pi-tons result from coupling of alternating charge or spin fluctuations with light, distinctly different from magnon.
[PDF] Electron-phonon and spin-phonon coupling in NaV2O5.
The contributions of spin–phonon coupling (SPC) to spin and thermal transport properties are important in emerging two-dimensional (2D) magnetic semiconductors and are relevant to the data security and working stability of spin-based devices. By evaluating the dynamical stability of both ferromagnetic (FM) a. This coupling has essentially the same form as that obtained from the symmetry considerations in Ref. [39] for algebraic spin liquids. In this picture, we study the observable consequences of the spin-lattice coupling through the phonon dynamics. By calculating the phonon self-energy, we compute the sound attenuation coefficient and the Hall.
The manifestation of spin-phonon coupling in CaMnO{sub 3}.
On the other hand, the thermally activated gap Q is reflected on the HS population growth with the assistance of phonon softening mechanism, which indicates energy transfer from the external thermal energy to the system magnetic energy by way of spin-orbit-phonon coupling, as also reflected on the tripled thermal expansion coefficient α(T. Suggesting that phonon scattering associated with short- and long-ranged antiferromagnetic order is suppressedin thepresence ofthemobilized charge.This interplaybetweenbound charge andspin-phonon coupling might allow for the reversible control of spin fluctuations using weak external fields.
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