Nonlinear Spin Wave Effects in the System of Lateral Magnonic Structures

Sadovnikov, A. V.; Odintsov, S. A.; Бегинин, Е. Н.; Grachev, A. A.; Gubanov, V. A.; Шешукова, С. Е.; Sharaevskiĭ, Yu. P.; Никитов, С. А.

doi:10.1134/s0021364018010113

Cited by 44 publications

(18 citation statements)

References 24 publications

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“…1, b-d видно, как распределения меняются в зависимости от изменения ширины волноводов. При этом чем больше различие в значении ширин микроволноводов, тем больше разница величин внутренних магнитных полей в центрах обеих структур и тем меньше эффективность связи ПМСВ, распространяющихся вдоль оси x. Также отметим, что распределение поля H i (y) ассиметрично относительно центра каждой из латеральных структур, что приводит к изменению интеграла перекрытия собственных мод отдельно взятых ЖИГ микроволноводов [1,21] и, как следствие, к изменению связи между распространяющимися ПМСВ. Таким образом, из решения статической задачи становится понятным, что для моделирования МКЭ и вычисления спектров собственных мод волн, распространяющихся в системе латеральных магнитных миковолноводов, необходимым является учет неоднородного распределения статического магнитного поля внутри структур.…”

Section: модель структурыunclassified

“…В работе [21] представлены расчёты нелинейных эффектов в структуре из латеральных микроволноводов одинаковой ширины и показано, что динамика спиновых волн в латеральных микроволноводах описывается системой связанных нелинейных уравнений Гинзбурга-Ландау [16]…”

Section: результаты численного экспериментаunclassified

“…Здесь Φ 1,2 = Φ 1,2 (x)| y=y 1,2 -амплитуда спиновой волны вдоль оси x, y 1,2 координаты центральных точек в волноводах S 1 и S 2 , соответственно; коэффициент связи спиновых волн между латеральными волноводами; β -коэффициент пропорциональности; ς = dk d 2 -нелинейный коэффициент, который определяется из условия уменьшения намагниченности насыщения при увеличении амплитуды спиновой волны с учетом дисперсионного соотношения [21]; коэффициента T = 20 log(P 2 /P 1 ) на выходе микроволновода S 2 . На графике отмечены точки P 1 и P 2 , соответствующие двум режимам спин-волнового сигнала.…”

Section: результаты численного экспериментаunclassified

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Nonlinear spin-wave propagation in the nonidentical magnonic structures

Odintsov¹,

Sadovnikov²

2018

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Section: модель структурыunclassified

Section: результаты численного экспериментаunclassified

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Nonlinear spin-wave propagation in the nonidentical magnonic structures

Odintsov¹,

Sadovnikov²

2018

AND

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“…The observed progress in technologies utilizing magnetic materials requires new magnets with unique properties optimized for different applications. What is more, a permanent demand for soft and hard magnets with ultimate characteristics can be observed [ 7 , 8 , 9 , 10 , 11 ]. Designing such systems should include modeling of the magnetization processes using computer simulations, which enables the searching for and testing of their properties in a pre-lab state.…”

Section: Introductionmentioning

confidence: 99%

From Atomic Level to Large-Scale Monte Carlo Magnetic Simulations

et al. 2020

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This paper refers to Monte Carlo magnetic simulations for large-scale systems. We propose scaling rules to facilitate analysis of mesoscopic objects using a relatively small amount of system nodes. In our model, each node represents a volume defined by an enlargement factor. As a consequence of this approach, the parameters describing magnetic interactions on the atomic level should also be re-scaled, taking into account the detailed thermodynamic balance as well as energetic equivalence between the real and re-scaled systems. Accuracy and efficiency of the model have been depicted through analysis of the size effects of magnetic moment configuration for various characteristic objects. As shown, the proposed scaling rules, applied to the disorder-based cluster Monte Carlo algorithm, can be considered suitable tools for designing new magnetic materials and a way to include low-level or first principle calculations in finite element Monte Carlo magnetic simulations.

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“…Various chemical and physical synthesis methods, such as thermal decomposition using high-temperature boiling point solvents [ 7 ], polyol [ 8 ], microemulsions [ 9 ], microwave processing [ 10 ], sonochemistry [ 11 ], pulsed plasma in liquid [ 12 ], or inert gas condensation [ 13 ], have been used to obtain FePt nanoparticles with well-defined shape and controllable sizes. Various other reports deal with the specific link between synthesis methods and magnetic performances in a large range of magnetic materials [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. As a building block for various devices, FePt is also of interest.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Phase Coexistence and Hard–Soft Exchange Coupling in FePt Nanocomposite Magnets

et al. 2020

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With the aim of demonstrating phase coexistence of two magnetic phases in an intermediate annealing regime and obtaining highly coercive FePt nanocomposite magnets, two alloys of slightly off-equiatomic composition of a binary Fe-Pt system were prepared by dynamic rotation switching and ball milling. The alloys, with a composition Fe53Pt47 and Fe55Pt45, were subsequently annealed at 400 °C and 550 °C and structurally and magnetically characterized by means of X-ray diffraction, 57Fe Mössbauer spectrometry and Superconducting Quantum Interference Device (SQUID) magnetometry measurements. Gradual disorder–order phase transformation and temperature-dependent evolution of the phase structure were monitored using X-ray diffraction of synchrotron radiation. It was shown that for annealing temperatures as low as 400 °C, a predominant, highly ordered L10 phase is formed in both alloys, coexisting with a cubic L12 soft magnetic FePt phase. The coexistence of the two phases is evidenced through all the investigating techniques that we employed. SQUID magnetometry hysteresis loops of samples annealed at 400 °C exhibit inflection points that witness the coexistence of the soft and hard magnetic phases and high values of coercivity and remanence are obtained. For the samples annealed at 500 °C, the hysteresis loops are continuous, without inflection points, witnessing complete exchange coupling of the hard and soft magnetic phases and further enhancement of the coercive field. Maximum energy products comparable with values of current permanent magnets are found for both samples for annealing temperatures as low as 500 °C. These findings demonstrate an interesting method to obtain rare earth-free permanent nanocomposite magnets with hard–soft exchange-coupled magnetic phases.

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Nonlinear Spin Wave Effects in the System of Lateral Magnonic Structures

Cited by 44 publications

References 24 publications

Nonlinear spin-wave propagation in the nonidentical magnonic structures

Nonlinear spin-wave propagation in the nonidentical magnonic structures

From Atomic Level to Large-Scale Monte Carlo Magnetic Simulations

Magnetic Phase Coexistence and Hard–Soft Exchange Coupling in FePt Nanocomposite Magnets

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