Magnonic waveguide based on exchange-spring magnetic structure | Zendy

Lixiang Wang | Zendy; Leisen Gao | Zendy; Lichuan Jin | Zendy; Yulong Liao | Zendy; Tianlong Wen | Zendy; Xiaoli Tang | Zendy; Huaiwu Zhang | Zendy; Zhiyong Zhong | Zendy

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Magnonic waveguide based on exchange-spring magnetic structure

Author(s) -

Lixiang Wang,

Leisen Gao,

Lichuan Jin,

Yulong Liao,

Tianlong Wen,

Xiaoli Tang,

Huaiwu Zhang,

Zhiyong Zhong

Publication year - 2018

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.5018637

Subject(s) - magnonics , spin wave , physics , micromagnetics , magnon , condensed matter physics , beam (structure) , spins , excitation , dipole , spin (aerodynamics) , ferromagnetism , magnetic field , spin polarization , optics , spin hall effect , quantum mechanics , magnetization , thermodynamics , electron

We propose to use a soft/hard exchange-spring coupling bilayer magnetic structure to introduce a narrow channel for spin-wave propagation. We show by micromagnetic simulations that broad-band Damon-Eshbach geometry spin waves can be strongly localized into the channel and propagate effectively with a proper high group velocity. The beamwidth of the bound mode spin waves is almost independent from the frequency and is smaller than 24nm. For a low-frequency excitation, we further investigate the appearance of two other spin beams in the lateral of the channel. In contrast to a domain wall, the channel formed by exchange-spring coupling can be easier to realize in experimental scenarios and holds stronger immunity to surroundings. This work is expected to open new possibilities for energy-efficient spin-wave guiding as well as to help shape the field of beam magnonics.

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