magnetoelastic interaction
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2020 ◽  
Vol 65 (10) ◽  
pp. 912
Author(s):  
V. G. Bar’yakhtar ◽  
A. G. Danilevich

A general method for constructing a model of the dissipative function describing the relaxation processes induced by the damping of coupled magnetoacoustic waves in magnetically ordered materials has been developed. The obtained model is based on the symmetry of the magnet and describes both exchange and relativistic interactions in the crystal. The model accounts for the contributions of both the magnetic and elastic subsystems to the dissipation, as well asthe relaxation associated with the magnetoelastic interaction. The dispersion law for coupled magnetoelastic waves is calculated in the case of a uniaxial ferromagnet of the “easy axis” type. It is shown that the contribution of the magnetoelastic interaction to dissipative processes can play a significant role in the case of magnetoacoustic resonance.





2D Materials ◽  
2020 ◽  
Vol 7 (3) ◽  
pp. 035030 ◽  
Author(s):  
Diana Vaclavkova ◽  
Alex Delhomme ◽  
Clément Faugeras ◽  
Marek Potemski ◽  
Aleksander Bogucki ◽  
...  


2018 ◽  
Vol 2018 (11) ◽  
Author(s):  
V. S. Vlasov ◽  
◽  
M. Yu. Dianov ◽  
L. N. Kotov ◽  
V. G. Shavrov ◽  
...  


2018 ◽  
Vol 2018 (10) ◽  
Author(s):  
V. S. Vlasov ◽  
◽  
M. Yu. Dianov ◽  
L . N.Kotov Kotov ◽  
V. G. Shavrov Shavrov ◽  
...  


2018 ◽  
Vol 63 (9) ◽  
pp. 836 ◽  
Author(s):  
V. G. Bar’yakhtar ◽  
A. G. Danilevich

The dispersion laws for coupled magnetoelastic waves in ferromagnets with uniaxial or cubic symmetry have been calculated. The features of obtained dispersion laws in the vicinity of spin-reorientation phase transitions are analyzed. The interaction between elastic and spin waves is shown to depend on the direction of the ferromagnet magnetic moment. The influence of the magnetoelastic interaction on the dispersion law of quasispin waves in the degenerate ground state of a uniaxial “easy plane” ferromagnet is studied. The results of calculations show that the magnetoelastic interaction eliminates the degeneration and leads to the appearance of a magnetoacoustic gap in the ferromagnet spectrum. The behavior of the spectra of coupled magnetoelastic waves in the vicinity of lattice phase transitions, namely, in the vicinity of martensitic phase transformations in materials with the shape memory effect, is analyzed. The obtained results are used to interpret experimental data obtained for the Ni–Mn–Ga alloy. The phenomenon of a drastic decrease of the elastic moduli for this alloy, when approaching the martensitic phase transition point is explained theoretically. It is shown that the inhomogeneous magnetostriction is the main factor affecting the elastic characteristics of the material concerned. A model dissipative function describing the relaxation processes associated with a damping of coupled magnetoelastic waves in ferromagnets with cubic or uniaxial symmetry is developed. It takes the symmetry of a ferromagnet into account and describes both the exchange and relativistic interactions in the crystal.



2018 ◽  
Vol 08 (02) ◽  
pp. 1850011 ◽  
Author(s):  
A. S. Krylov ◽  
S. N. Sofronova ◽  
I. A. Gudim ◽  
S. N. Krylova ◽  
Rajesh Kumar ◽  
...  

Raman spectra of Ho[Formula: see text]NdxFe(BO3)4 ([Formula: see text], 0.75, 0.5, 0.25) have been studied in temperature range 10–400[Formula: see text]K. Two compositions ([Formula: see text], [Formula: see text]) demonstrate structural phase transition with soft mode restoration. The addition of Nd atoms increases interatomic spacing and decreases the temperature of structural phase transition. The solid solutions ([Formula: see text], 0.5, 0.25) demonstrate the emergence of the peaks corresponding to magnetoelastic interaction below Néel temperature. The order parameter of the magnetic phase transition has been determined. The equal concentrations of holmium and neodymium atoms prevent magnon soft modes condensation caused by exchange interactions in Fe–O–Fe chains are observed. Calculations confirm the data obtained in the experiment.



2018 ◽  
Vol 56 (1) ◽  
pp. 300-302
Author(s):  
Bahsheli Guliyev ◽  
Genber Kerimli


2015 ◽  
Vol 233-234 ◽  
pp. 471-475 ◽  
Author(s):  
D.A. Pleshev ◽  
Vladimir S. Vlasov ◽  
Leonid N. Kotov ◽  
F.F. Asadullin ◽  
S.M. Poleshikov ◽  
...  

The present work deals with investigation of features of a magnetization vector of nonlinear precession and elastic displacements close to ferromagnetic resonance in normal magnetized ferrite plate. The system of ordinary differential equations was solved numerically by the Runge-Kutta 7-8 orders method with control of the integration at every step length. The possible excitation of magnetoelastic autooscillations was found out in the paper. Two mechanisms of autooscillations: reorientation and detuning were investigated. The boundaries between the regular and chaotic reorientation autooscillations depending on the magnetic dissipation parameter and magnetoelastic interaction constant were determined.



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