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

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

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 The connection between vortex-like topological excitations and conventional excitations in quantum ferromagnetic spin systems on two-dimensional lattice and their stability

2015 ◽  
Vol 29 (29) ◽  
pp. 1550209
Author(s):  
Subhajit Sarkar ◽  
Ranjan Chaudhury ◽  
Samir K. Paul
Keyword(s):  
Nearest Neighbor ◽  
Magnetic Measurements ◽  
Spin Dynamics ◽  
Threshold Value ◽  
System Size ◽  
Heisenberg Ferromagnet ◽  
Two Dimensional ◽  
Stable States ◽  
Dimensional Lattice ◽  
Topological Excitations

In this paper, we present a scheme for the construction of quantum states of vortex-like topological excitations corresponding to spin-1/2 strongly XY-anisotropic nearest neighbor Heisenberg ferromagnet on two-dimensional lattice. The procedure involving Pauli spin basis states is carried out corresponding to both infinite dilute limit and finite density limit of vortex/anti-vortex. It is found that the corresponding quantum mechanical states representing charge 1 quantum vortices/anti-vortices can be expressed as linear combinations of single magnon states, composite multi-magnon states and the ground state. Detailed calculations show that these states are quantum mechanically stable states of the Hamiltonian only when the system size exceeds certain threshold value. Our analysis indicates that the interactions between different magnon modes can very well generate these topological excitations. Possible applications of our calculations to real magnetic systems are also discussed. Magnetic measurements probing spin dynamics may be undertaken to verify the existence of the threshold size for the stability of vortices.

Spin dynamics in a 3d Heisenberg ferromagnet in the paramagnetic state. I

Physica B+C ◽  
1981 ◽  
Vol 106 (1) ◽  
pp. 83-92 ◽  
Author(s):  
J. Labrujere ◽  
T.O. Klaassen ◽  
N.J. Poulis
Keyword(s):  
Spin Dynamics ◽  
Paramagnetic State ◽  
Heisenberg Ferromagnet

Spin dynamics in the cubic Heisenberg ferromagnet EuS

1984 ◽  
Vol 30 (11) ◽  
pp. 6504-6513 ◽  
Author(s):  
H. G. Bohn ◽  
A. Kollmar ◽  
W. Zinn
Keyword(s):  
Spin Dynamics ◽  
Heisenberg Ferromagnet

Spin dynamics in a 3D Heisenberg ferromagnet. V. Finite fields and temperatures

1982 ◽  
Vol 15 (31) ◽  
pp. 6423-6435 ◽  
Author(s):  
J Labrujere ◽  
L J de Haas ◽  
G van Velzen ◽  
T O Klaassen ◽  
N J Poulis
Keyword(s):  
Finite Fields ◽  
Spin Dynamics ◽  
Heisenberg Ferromagnet

scholarly journals Longitudinal Spin Dynamics in the Heisenberg Antiferromagnet: Two-Magnon Excitations

2020 ◽  
Vol 65 (10) ◽  
pp. 865
Author(s):  
O. O. Boliasova ◽  
V. N. Krivoruchko
Keyword(s):  
Wave Vector ◽  
Spin Dynamics ◽  
Laser Pulses ◽  
Magnetization Dynamics ◽  
Longitudinal Magnetization ◽  
Fundamental Limits ◽  
Ultrafast Laser Pulses ◽  
Diagrammatic Technique ◽  
Antiferromagnetic Materials ◽  
Longitudinal Spin

Understanding the ultrafast spin dynamics in magnetically ordered materials is important for the comprehenssion of fundamental limits in spin-based magnetic electronics – magnonics. We have studied a microscopic model of magnetization dynamics in a two-sublattice antiferromagnet with the emphasis on longitudinal spin excitations. The diagrammatic technique for spin operators has been used to overcome limitations typical of phenomenological approaches. The graphical representations of spin wave propagators allow us to summing up the infinite series of distinctive diagrams. Its sum is transformed into an analytic expression for the longitudinal spin susceptibility xzz (q, w) applicable in all regions of the frequency w and wave vector q spaces beyond the hydrodynamical and critical regimes. It is found that the longitudinal magnetization dynamics consists of two types of excitations, which have different dependences on the temperature and wave vector q. The obtained result could be important for understanding the physics of nonequilibrium magnetic dynamics under the effect of ultrafast laser pulses in antiferromagnetic materials.

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