Resonance properties of bi-component arrays of magnetic dots magnetized perpendicular to their planes

Abstract

The spin wave spectrum of dense arrays of rectangular elements periodically arranged in a two-dimensional magnonic crystal with a complex unit cell and magnetized perpendicularly to the array plane has been characterized using broadband ferromagnetic resonance (FMR) spectroscopy. The crystal's unit cell consists of non-collinear orientations of constituting elongated rectangular elements. We found that only one mode is excited in the perpendicular-to-plane FMR in complete magnetic saturation. We also conducted out-of-plane angle resolved measurements of the FMR resonance field. We observe splitting of the singlet observed for the perfect perpendicular-to-plane orientation of the applied field into a doublet upon a tilt of the field from this orientation. The splitting of the singlet into a doublet is explained as an experimental evidence of dipole coupling of the elements on the arrays. Our experimental observations are in good agreement with the theory we developed to describe the magnetization dynamics on this periodic array.

Magneto-Plasmonics and Resonant Interaction of Light with Dynamic Magnetisation in Metallic and All-Magneto-Dielectric Nanostructures

“…For the sake of illustration, let us consider a dolmen-like structure Figure 6f [ 89 ]. It is noteworthy that dolmen-like structures play important role in modern plasmonics thanks to their unique optical properties (see, e.g., [ 92 ]).…”

“…It is noteworthy that dolmen-like structures play important role in modern plasmonics thanks to their unique optical properties (see, e.g., [ 92 ]). To date, magnonics experiments have been conducted on relatively large arrays of identical dolmens, and the dimensions of these dolmens are comparable with the wavelength of incident light [ 89 ]. However, from the viewpoint of magnetism, the dimensions of the dolmens can be reduced readily to an optical subwavelength, which is the case of the dolmens in [ 92 ].…”

“… ( a ) Light interaction with a spin wave in a uniform ferromagnetic thin film sitting on top of a dielectric substrate; ( b ) Excitation of the plasmon resonance in a ferromagnetic magnonic crystal leads to enhancement of the intensity of light scattered from the spin wave; ( c–f ) Some examples of plasmon resonance-supporting Permalloy magnonic crystals fabricated at the National University of Singapore (see, e.g., [ 86 ]). Reproduced from [ 57 , 87 – 89 ] with permission by AIP Publishing LLC, Copyright 1012, 2013, and by American Physical Society, Copyright 2012. …”

“… Simulated absolute values of the electric field in one unit cell of a periodic array of ( a ) Gold and ( b ) Permalloy dolmens with the same dimensions as in [ 89 ]. The wavelength of normally incident light is 632.8 nm.…”

An Experiment‐Based Numerical Treatment of Spin Wave Modes in Periodically Porous Materials

“…[6][7][8][9][10] These have the potential to control spin wave propagation and densities of states of magnons, and thus provide entirely new, spin-based ways to transfer and process information without moving charges. Significant progress has been made in the fabrication and characterization of magnonic crystals with 1D [10][11][12][13] and 2D periodicity in form of dot [2,[14][15][16] or antidot lattices, [8,17,18] or bicomponent composites. [19][20][21][22] Recently, Beginin et al realized spin wave guidance in 3D magnonic crystals in the shape of layered meanders.…”