Longitudinal spin dynamics in ferrimagnets: Multiple spin wave nature of longitudinal spin excitations

2016 ◽  
Vol 94 (5) ◽  
Author(s):  
V. N. Krivoruchko
Keyword(s):  
Spin Wave ◽  
Spin Dynamics ◽  
Longitudinal Spin ◽  
Wave Nature ◽  
Spin Excitations

scholarly journals Evolution of spin excitations from bulk to monolayer FeSe

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jonathan Pelliciari ◽  
Seher Karakuzu ◽  
Qi Song ◽  
Riccardo Arpaia ◽  
Abhishek Nag ◽  
...  
Keyword(s):  
Quantum Monte Carlo ◽  
Spin Dynamics ◽  
Spin Fluctuations ◽  
Superconducting Transition ◽  
Pairing Mechanism ◽  
Range Magnetic Order ◽  
X Ray Scattering ◽  
Spin Excitations ◽  
Order Of Magnitude ◽  
Long Range Magnetic Order

AbstractIn ultrathin films of FeSe grown on SrTiO3 (FeSe/STO), the superconducting transition temperature Tc is increased by almost an order of magnitude, raising questions on the pairing mechanism. As in other superconductors, antiferromagnetic spin fluctuations have been proposed to mediate SC making it essential to study the evolution of the spin dynamics of FeSe from the bulk to the ultrathin limit. Here, we investigate the spin excitations in bulk and monolayer FeSe/STO using resonant inelastic x-ray scattering (RIXS) and quantum Monte Carlo (QMC) calculations. Despite the absence of long-range magnetic order, bulk FeSe displays dispersive magnetic excitations reminiscent of other Fe-pnictides. Conversely, the spin excitations in FeSe/STO are gapped, dispersionless, and significantly hardened relative to its bulk counterpart. By comparing our RIXS results with simulations of a bilayer Hubbard model, we connect the evolution of the spin excitations to the Fermiology of the two systems revealing a remarkable reconfiguration of spin excitations in FeSe/STO, essential to understand the role of spin fluctuations in the pairing mechanism.

scholarly journals Longitudinal Spin Excitations and Magnetic Anisotropy in Antiferromagnetically OrderedBaFe2As2

2013 ◽  
Vol 3 (4) ◽  
Author(s):  
Chong Wang ◽  
Rui Zhang ◽  
Fa Wang ◽  
Huiqian Luo ◽  
L. P. Regnault ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Longitudinal Spin ◽  
Spin Excitations

Longitudinal spin dynamics in nickel fluorosilicate

2014 ◽  
Vol 40 (7) ◽  
pp. 635-640 ◽  
Author(s):  
E. G. Galkina ◽  
B. A. Ivanov ◽  
V. I. Butrim
Keyword(s):  
Spin Dynamics ◽  
Longitudinal Spin

scholarly journals Ultrafast optically induced spin transfer in ferromagnetic alloys

2020 ◽  
Vol 6 (3) ◽  
pp. eaay8717 ◽  
Author(s):  
M. Hofherr ◽  
S. Häuser ◽  
J. K. Dewhurst ◽  
P. Tengdin ◽  
S. Sakshath ◽  
...  
Keyword(s):  
Density Functional ◽  
Spin Dynamics ◽  
Research Area ◽  
Spin Transfer ◽  
Optical Manipulation ◽  
Functional Theory ◽  
Control Schemes ◽  
All Optical ◽  
Spin Excitations ◽  
Experimental Findings

The vision of using light to manipulate electronic and spin excitations in materials on their fundamental time and length scales requires new approaches in experiment and theory to observe and understand these excitations. The ultimate speed limit for all-optical manipulation requires control schemes for which the electronic or magnetic subsystems of the materials are coherently manipulated on the time scale of the laser excitation pulse. In our work, we provide experimental evidence of such a direct, ultrafast, and coherent spin transfer between two magnetic subsystems of an alloy of Fe and Ni. Our experimental findings are fully supported by time-dependent density functional theory simulations and, hence, suggest the possibility of coherently controlling spin dynamics on subfemtosecond time scales, i.e., the birth of the research area of attomagnetism.

Longitudinal spin dynamics in the Heisenberg ferromagnet: Diagrammatic approach

2002 ◽  
Vol 65 (21) ◽  
Author(s):  
Yu. A. Izyumov ◽  
N. I. Chaschin ◽  
V. Yu. Yushankhai
Keyword(s):  
Spin Dynamics ◽  
Heisenberg Ferromagnet ◽  
Longitudinal Spin

Neutron scattering study of the spin dynamics and spin-wave form factor of chromium

1977 ◽  
Vol 15 (3) ◽  
pp. 1415-1421 ◽  
Author(s):  
S. K. Sinha ◽  
G. R. Kline ◽  
C. Stassis ◽  
N. Chesser ◽  
N. Wakabayashi
Keyword(s):  
Form Factor ◽  
Neutron Scattering ◽  
Spin Wave ◽  
Spin Dynamics ◽  
Wave Form ◽  
Scattering Study ◽  
Neutron Scattering Study

scholarly journals Muon-spin-relaxation study of the critical longitudinal spin dynamics in a dipolar Heisenberg ferromagnet

1996 ◽  
Vol 53 (1) ◽  
pp. 350-353 ◽  
Author(s):  
A. Yaouanc ◽  
P. Dalmas de Réotier ◽  
P. C. M. Gubbens ◽  
A. M. Mulders ◽  
F. E. Kayzel ◽  
...  
Keyword(s):  
Spin Relaxation ◽  
Spin Dynamics ◽  
Muon Spin ◽  
Muon Spin Relaxation ◽  
Heisenberg Ferromagnet ◽  
Longitudinal Spin ◽  
Relaxation Study

scholarly journals Spin excitations and spin wave gap in the ferromagnetic Weyl semimetal Co3Sn2S2

2020 ◽  
Vol 64 (1) ◽  
Author(s):  
Chang Liu ◽  
JianLei Shen ◽  
JiaCheng Gao ◽  
ChangJiang Yi ◽  
Di Liu ◽  
...  
Keyword(s):  
Spin Wave ◽  
Weyl Semimetal ◽  
Spin Excitations ◽  
Spin Wave Gap

scholarly journals Signatures of a liquid-crystal transition in spin-wave excitations of skyrmions

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Narayan Mohanta ◽  
Andrew D. Christianson ◽  
Satoshi Okamoto ◽  
Elbio Dagotto
Keyword(s):  
Spin Wave ◽  
Magnetic Order ◽  
Inelastic Neutron Scattering ◽  
Spin Dynamics ◽  
Wave Spectrum ◽  
Exchange Interactions ◽  
Inelastic Neutron ◽  
Spin Wave Excitations ◽  
Crystal Transition ◽  
Dynamics Simulations

AbstractUnderstanding the spin-wave excitations of chiral magnetic order, such as the skyrmion crystal (SkX), is of fundamental interest to confirm such exotic magnetic order. The SkX is realized by competing Dzyaloshinskii-Moriya and ferromagnetic-exchange interactions with a magnetic field or anisotropy. Here, we compute the dynamical spin structure factor, using Monte Carlo and spin dynamics simulations, extracting the spin-wave spectrum in the SkX, in the vicinity of the paramagnet to SkX transition. Inside the SkX, we find six spin-wave modes, which are supplemented by another mode originating from the ferromagnetic background. Above the critical temperature Ts for the skyrmion crystallization, we find a diffusive regime, reminiscent of the liquid-to-crystal transition, revealing that topological spin texture of skyrmionic character starts to develop above Ts as the precursor of the SkX. We discuss the opportunities for the detection of the spin waves of the SkX using inelastic-neutron-scattering experiments in manganite-iridate heterostructures.

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