Merging of spin-wave modes in obliquely magnetized circular nanodots

Julia Kharlan (Corresponding author), Vladyslav Borynskyi, Sergey A. Bunyaev, Pavlo Bondarenko, Olga Salyuk, Vladimir Golub, Alexander A. Serga, Oleksandr V. Dobrovolskiy, Andrii Chumak, Roman Verba (Corresponding author), Gleb N. Kakazei

Publications: Contribution to journalArticlePeer Reviewed

Abstract

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
̃
𝜃
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.
Original languageEnglish
Article number014407
Number of pages8
JournalPhysical Review B
Volume105
Issue number1
DOIs
Publication statusPublished - 5 Jan 2022

Austrian Fields of Science 2012

  • 103015 Condensed matter
  • 103017 Magnetism

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