Journal
PHYSICAL REVIEW B
Volume 105, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.105.014407
Keywords
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Funding
- National Academy of Sciences of Ukraine [23-04/13-2021]
- Network of Extreme Conditions Laboratories-NECL [NORTE-01-0145-FEDER-022096, POCI-0145-FEDER-030085, EXPL/IF/00541/2015]
- Portuguese Foundation of Science and Technology (FCT) [NORTE-01-0145-FEDER-022096, POCI-0145-FEDER-030085, EXPL/IF/00541/2015]
- European Cooperation in Science and Technology via COST Action [CA16218]
- Deutsche Forschungsgemeinschaft (DFG, German Re-search Foundation) [TRR 173/2-268565370]
- Austrian Science Fund (FWF) [I 4917-N, I 4889]
- National Research Foundation of Ukraine [2020.02/0261]
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In this study, the unconventional single-frequency resonance response of flat circular Permalloy nanodots under a certain critical angle of magnetic field is observed. This phenomenon can be explained by micromagnetic simulations and analytical theory, and provides a way to create spin-wave systems with spectrally narrow magnetic noise.
Magnetic nanoelements attract great interest due to their prospects for data storage and signal processing. Spin-wave confinement in these elements implies wave-number quantization, discrete frequency spectra and thus complex resonance patterns, strongly dependent on the elements' geometry and static magnetic configuration. Here we report experimental observation of unconventional single-frequency resonance response of flat circular Permalloy nanodots, which is achieved via the application of a magnetic field at a certain critical angle (theta) over tilde (B) with respect to the dot normal. This observation is explained as the merging of spin-wave eigenmodes under the transition of the spin-wave dispersion from the forward-volume to the backward-volume type, as elucidated by micromagnetic simulations in conjunction with an analytical theory. Our results offer a way for the creation of spin-wave systems with spectrally narrow magnetic noise.
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