Magnonic Crystals — the Magnetic Counterpart of Photonic Crystals

Abstract

Yablonovitch's papers reported experimental evidence for the existence of an absolute frequency gap in the spectrum of electromagnetic waves propagating in a periodic dielectric structure (a photonic crystal). The possibility of the existence of complete energy gaps in the spectra of other excitations propagating in periodic macrostructures -by analogy to photonic crystals -was considered in a number of studies. In this work we investigated the magnon spectrum of a two-dimensional periodic composite consisting of infinitely long cylindrical ferromagnetic rods periodically embedded in a homogeneous medium with magnetic properties differing from those of the cylinders. We show that the magnonic spectrum of this composite structure exhibits frequency regions forbidden for magnon propagation, and those energy gaps are found to be sensitive to the exchange contrast between the constituent materials as well as to the contrast of their magnetizations; both the magnetization and the exchange contrasts become gap-creating factors. The widths of the respective gaps obtained in the magnonic spectra are studied as functions of different parameters characterizing the magnetic structure under investigation.

Large magnonic band gaps and spectra evolution in three-dimensional magnonic crystals based on magnetoferritin nanoparticles

“…[29][30][31][32] By adjusting the constituent materials, the shape of individual elements and their periodic spatial (or planar) arrangement the dispersion of spin waves in MCs can be tailored in a way impossible in other materials and composites. This implies a possibility of modeling the velocity and direction of the spin waves propagating in the MCs.…”

Photonic-magnonic crystals: Multifunctional periodic structures for magnonic and photonic applications

“…V C 2014 AIP Publishing LLC. In the past decades, much effort has been put into the theoretical and experimental study of artificial periodic structures which can behave as photonic crystals (PCs), 1-7 magnonic crystals (MCs), [8][9][10][11][12][13][14][15] plasmonic crystals, 16 polaritonic crystals, 17 or phononic crystals. 18,19 These periodic structures are explored for molding the flow of electromagnetic waves (EMWs), spin waves (SWs), plasmons, polaritons, and acoustic waves, respectively.…”

Wave modes of collective vortex gyration in dipolar-coupled-dot-array magnonic crystals

“…For example, some earlier works1415 propose magnetic quantum dot cellular automata that consist of single domain magnets for alternative information-signal propagation. New advances in both nanofabrication technology16 and time- and space-resolved measurement techniques1217 have enabled intensive studies of a wide variety of magnonic crystals (MCs) such as one-dimensional (1D) strips1819202122, two-dimensional (2D) arrays of magnetic nanoelements23242526, and antidot lattices of periodic holes having a circular or rectangular shape in 2D continuous films272829. Furthermore, technological interest in the practical applicability of MCs to future information storage and processing devices3031 is rapidly growing.…”