Spin-wave propagation spectrum in magnetization-modulated cylindrical nanowires

Spin-wave propagation in periodic magnetization-modulated cylindrical nanowires is studied by micromagnetic simulation. Spin wave scattering at the interface of two magnetization segments causes a spin-wave band structure, which can be effectively tuned by changing either the magnetization modulatio...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2016-09, Vol.414, p.49-54
Main Authors: Li, Zhi-xiong, Wang, Meng-ning, Nie, Yao-zhuang, Wang, Dao-wei, Xia, Qing-lin, Tang, Wei, Zeng, Zhong-ming, Guo, Guang-hua
Format: Article
Language:English
Subjects:
Magnetic cylindrical nanowire
Magnetization
Magnonic crystal
Mathematical analysis
Micromagnetic simulation
Modulation
Nanowires
Oscillating
Segments
Simulation
Spin wave
Spin waves
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Summary:Spin-wave propagation in periodic magnetization-modulated cylindrical nanowires is studied by micromagnetic simulation. Spin wave scattering at the interface of two magnetization segments causes a spin-wave band structure, which can be effectively tuned by changing either the magnetization modulation level or the period of the cylindrical nanowire magnonic crystal. The bandgap width is oscillating with either the period or magnetization modulation due to the oscillating variation of the spin wave transmission coefficient through the interface of the two magnetization segments. Analytical calculation based on band theory is used to account for the micromagnetic simulation results. •A magnetization-modulated cylindrical nanowire magnonic crystal is proposed.•Propagating characteristics of spin waves in such magnonic crystal are studied.•Spin-wave spectra can be manipulated by changing modulation level and period.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2016.04.057