Resonant Dynamics of the Domain Walls in Multilayer Ferromagnetic Structure

Екомасов, Е. Г.; Gumerov, A. M.; Муртазин, Р. Р.; Kudryavtsev, R. V.; Ekomasov, A. E.; Abakumova, Natalya N.

doi:10.4028/www.scientific.net/ssp.233-234.51

Cited by 13 publications

(13 citation statements)

References 9 publications

(17 reference statements)

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“…Many papers study the effect of spatial modulation of the periodic potential (or the presence of impurities in the system) on the dynamics of the SGE solitons [1,2,5,6,19,28]. The SGE model with impurities describes, for example, a multilayer ferromagnet [40][41][42][43]. The importance of impurity modes in the kink dynamics was shown in [5,28,36].…”

Section: Introductionmentioning

confidence: 99%

Excitation of Large-Amplitude Localized Nonlinear Waves by the Interaction of Kinks of the Sine-Gordon Equation with Attracting Impurity

Gumerov¹,

Екомасов²,

Kudryavtsev³

et al. 2019

Nelin. Dinam.

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The generation and evolution of localized waves on an impurity in the scattering of a kink of the sine-Gordon equation are studied. It is shown that the problem can be considered as excitation of oscillations of a harmonic oscillator by a short external impulse. The external impulse is modeled by the scattering of a kink on an impurity. The influence of the modes of motion of a kink on the excitation energy of localized waves is numerically and analytically studied. The method of collective coordinate for the analytical study is used. The value of this energy is determined by the ratio of the impurity parameters and the initial kink velocity. It is shown that the dependence of the energy (and amplitude) of the generated localized waves

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Section: Introductionmentioning

confidence: 99%

Excitation of Large-Amplitude Localized Nonlinear Waves by the Interaction of Kinks of the Sine-Gordon Equation with Attracting Impurity

Gumerov¹,

Екомасов²,

Kudryavtsev³

et al. 2019

Nelin. Dinam.

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“…For instance, they often took into account the magnetic anisotropy modulation both for the case of point and extended defects [21,33]. It is shown that when a DW passes through a thin magnetic layer with a lower anisotropy value, high-amplitude localized nonlinear waves of magnetization can arise in it [19,33,34]. The amount of energy expended on the excitation of localized waves determine the effective damping of the moving DW and can vary depending on the DW initial velocity.…”

Section: Introductionmentioning

confidence: 99%

Localized magnetic inhomogeneities generation on defects as a new channel of damping for a moving domain wall

Gumerov¹,

Екомасов²,

Kudryavtsev³

et al. 2018

LoM

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The paper presents theoretical studies on the domain wall energy losses that arise when it moves through the magnetic defect region. These losses are largely related to the generation of localized magnetization waves in the defect region. It is shown that the process of the domain wall energy scattering on the defect can be regarded as a new "channel of damping" for a domain wall. The study was carried out using numerical and analytical methods through the example of a three-layer model of the ferromagnetic structure, in which the intermediate layer differs in its physical parameters from the rest of the crystal. The intermediate layer (or magnetic defect) was simulated by a spatial modulation of the magnetic parameters. The modes of motion, in which "effective damping" is minimal, were calculated. The damping value depends on the excitation energy of the localized waves and is determined by the ratio of the defect properties and initial velocity of the domain wall motion. It is specifically shown that an increase in the domain wall energy loss is associated with the increase in the localized waves oscillations amplitude. In this case, the dependence of the localized waves oscillations amplitude on the domain wall initial velocity only has one maximum. It is at this point that the domain wall energy losses are maximal. They can be significantly reduced if the domain wall velocity is noticeably higher or lower than the maximum. This behavior was studied for both the point and extended defects.

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“…However, in the presence of perturbations, the structure of solitons can be changed and they can be more accurately described by deformable quasiparticles [5]. Soliton's internal degrees of freedom can be excited in this case and they can play a very important role in a number of physical processes [8][9][10][11][12]. Soliton internal modes can be responsible for the non-trivial effects of their interactions [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Because, in the considered case, K and W are constant, equations (11,12) give the possibility to find all frequencies ! of the impurity modes in the potential well of given size.…”

mentioning

confidence: 99%

Interaction of sine‐Gordon solitons in the model with attracting impurities

Екомасов

Gumerov

Муртазин

2016

Math Methods in App Sciences

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Resonant Dynamics of the Domain Walls in Multilayer Ferromagnetic Structure

Abstract: The domain walls dynamics and generation and evolution of magnetic inhomogeneities of soliton type, emerging in a thin flat layer with the parameters of the magnetic anisotropy, which are different from other two thick layers of the five-layer ferromagnetic structure, were investigated.

Cited by 13 publications

References 9 publications

Excitation of Large-Amplitude Localized Nonlinear Waves by the Interaction of Kinks of the Sine-Gordon Equation with Attracting Impurity

Excitation of Large-Amplitude Localized Nonlinear Waves by the Interaction of Kinks of the Sine-Gordon Equation with Attracting Impurity

Localized magnetic inhomogeneities generation on defects as a new channel of damping for a moving domain wall

Interaction of sine‐Gordon solitons in the model with attracting impurities

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