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Spin waves and transverse domain walls driven by spin waves: Role of damping

Chinese Physics B 2020年第7期29卷 506-515页

作者： Zi-Xiang Zhao Peng-Bin He Meng-Qiu Cai Zai-Dong Li School of Physics and Electronics Hunan UniversityChangsha 410082China School of Science Tianjin University of TechnologyTianjin 300384China State Key Laboratory of Quantum Optics and Quantum Optics Devices Shanxi UniversityTaiyuan 030006China Department of Applied Physics Hebei University of TechnologyTianjin 300401China

Based on the uniform,helical and spiral domain-wall magnetic configurations,the excited spin waves are studied with emphasis on the role of *** find that the damping closes the gap of dispersion,and greatly influences the dispersion in the long-wave region for the spin waves of spiral wall and helical *** the uniform configuration,the Dzyaloshinskii-Moriya interaction determines the modification of dispersion by the ***,we investigate the interaction between spin waves and a moving spiral domain *** the presence of damping,the amplitude of spin wave can increase after running across the wall for small wave *** by the spin waves,the wall propagates towards the spin-wave source with an increasing *** the case without damping,the relation between the wall velocity and the spin-wave frequency depends on the position of wall.

关键词： spin waves domain walls helical magnetic structure collective coordinates

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Peregrine Soliton and Akhmediev Breathers in a Chameleon Electrical Transmission Line

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Journal of Applied Mathematics and Physics 2020年第12期8卷 2775-2792页

作者： Bedel Giscard Onana Essama Salome Ndjakomo Essiane Frederic Biya-Motto Bibiane Mireille Ndi Nnanga Mohammed Shabat Jacques Atangana Applied Biotechnology and Engineering Laboratory Department of Electrical Engineering Higher Technical Teachers Training College (HTTTC) of EBOLOWA University of Yaounde I Yaounde Cameroon Laboratory of Electronics Department of Physics Faculty of Science University of Yaounde I Yaounde Cameroon Laboratory of Mechanics Department of Physics Faculty of Science University of Yaounde I Yaounde Cameroon Department of Physics Islamic University of Gaza Gaza Palestine Higher Teacher Training College of Yaounde University of Yaounde I Yaounde Cameroon

We analyze the particular behavior exhibited by a chaotic waves field containing Peregrine soliton and Akhmediev breathers. This behavior can be assimilated to a tree with “roots of propagation” which propagate randomly. Besides, this strange phenomenon can be called “tree structures”. So, we present the collapse of dark and bright solitons in order to build up the above mentioned chaotic waves field. The investigation is done in a particular nonlinear transmission line called chameleon nonlinear transmission line. Thus, we show that this line acts as a bandpass filter at low frequencies and the impact of distance, frequency and dimensionless capacitor are also presented. In addition, the chameleon’s behavior is due to the fact that without modifying the appearance structure, it can present alternatively purely right- or left-handed transmission line. This line is different to the composite one.

关键词： Freak Waves Generation Transmission Line Metamaterials Right/Left-Handed Behaviors Tree Structures collective coordinates

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