Anisotropic spin-wave dispersion in two-dimensional Ni80Fe20 diatomic nanodot array

Anulekha De, Chandrima Banerjee, Avinash Kumar Chaurasiya, Ruma Mandal, Yoshichika Otani, Rajib Kumar Mitra, Anjan Barman

Research output: Contribution to journalArticle

Abstract

Artificially patterned magnonic crystals serve as a promising candidate for the emerging research fields of magnonics and spintronics. Here, we investigate the spin-wave dispersion in a diatomic nanodot lattice made of Ni80Fe20 nanodots of two different diameters placed in close proximity to form a binary magnonic crystal with a complex double-dot unit cell. The frequency dispersion of SW eigenmodes experimentally measured by the Brillouin light-scattering technique is in good agreement with the numerically calculated band structure derived from the linearized Landau-Lifshitz equation. Due to the change of the nature of interaction among the dots in two mutually perpendicular orientation of the applied bias magnetic field, magnonic band structure, including the slope of the dispersion curves, varies significantly. The anisotropic SW propagation is also studied numerically by local excitation of spin-wave dynamics in this system. This phenomenon is further explained by the calculated iso-frequency contours. Efficient manipulation of spin waves in this new type of two-dimensional magnonic crystal is promising for the development of nanoscale magnonic and spintronic devices.

Original languageEnglish
Article number165557
JournalJournal of Magnetism and Magnetic Materials
Volume491
DOIs
Publication statusPublished - 2019 Dec 1
Externally publishedYes

Keywords

  • Brillouin light scattering (BLS)
  • Diatomic nanodot array
  • Iso-frequency contours
  • Magnonic band structure
  • Micromagnetic simulations
  • Plane wave method (PWM)
  • Spin-wave dispersion

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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