Spin wave spectra in perpendicularly magnetized permalloy rings | Zendy

Xue Zhou | Zendy; Jun Ding | Zendy; Mikhail Kostylev | Zendy; A. O. Adeyeye | Zendy

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Spin wave spectra in perpendicularly magnetized permalloy rings

Author(s) -

Xue Zhou,

Jun Ding,

Mikhail Kostylev,

A. O. Adeyeye

Publication year - 2015

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4916029

Subject(s) - permalloy , perpendicular , spin wave , condensed matter physics , ferromagnetic resonance , materials science , excitation , resonance (particle physics) , ferromagnetism , spectroscopy , spectral line , nuclear magnetic resonance , magnetic field , magnetization , atomic physics , physics , astronomy , geometry , mathematics , quantum mechanics

The dynamic behavior of perpendicularly magnetized permalloy circular rings is systematically investigated as a function of film thickness using broadband field modulated ferromagnetic resonance spectroscopy. We observed the splitting of one spin wave mode into a family of dense resonance peaks for the rings, which is markedly different from the single mode observed for continuous films of the same thickness. As the excitation frequency is increased, the mode family observed for the rings gradually converges into one mode. With the increase in the film thickness, a sparser spectrum of modes is observed. Our experimental results are in qualitative agreement with the dynamic micromagnetic simulations.

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