Spin-wave propagation in a microstructured magnonic crystal

Abstract

Transmission of microwave spin waves through a microstructured magnonic crystal in the form of a permalloy waveguide of a periodically varying width was studied experimentally and theoretically. The spin wave characteristics were measured by spatially-resolved Brillouin light scattering microscopy. A rejection frequency band was clearly observed. The band gap frequency was controlled by the applied magnetic field. The measured spin-wave intensity as a function of frequency and propagation distance is in good agreement with a model calculation.Comment: 4 pages, 3 figure

Characterization of magnetostatic surface spin waves in magnetic thin films: evaluation for microelectronic applications

“…technology [36]. Thin-films such as Py which can be easily deposited are preferable, however, the propagation length is much shorter than what is required for chip-to-chip communications.…”

Electric-Field Control of Magnon Gaps in a Ferromagnet using a Spatially-Periodic Electric Field

“…Active manipulation of the spin currents, especially within insulating materials such as ferrites, has proved much more di±cult, and e®orts have focused on modi¯cations from internal currents, 17,23 external magnetic¯elds, 19,20,24 or spin currents. 25 A simple active method of controlling the propagation of spin currents, especially without substantial intrinsic dissipation, would have broad utility in the fundamental studies of spin-wave propagation, such as by allowing time-dependent studies of spin current propagation and dissipation that would illuminate many of the fundamental processes involved in spin current dynamics.…”

“…Passive control of spin current propagation by opening gaps in the spin-wave dispersion, such as with a magnonic crystal, [13][14][15][16][17][18][19][20][21][22] has been achieved, especially for quasi-one-dimensional structures. Active manipulation of the spin currents, especially within insulating materials such as ferrites, has proved much more di±cult, and e®orts have focused on modi¯cations from internal currents, 17,23 external magnetic¯elds, 19,20,24 or spin currents.…”

A spin-wave logic gate based on a width-modulated dynamic magnonic crystal

“…The use of nanostructured width-modulated waveguides made of Permalloy films, as in Ref. [9], will allow for a significant reduction of the size of the dynamic magnonic crystal and the logic circuit presented here.…”

“…The dispersion management introduced by an artificial periodicity of the magnetic film allows for the observation of a variety of different linear and nonlinear spin-wave phenomena. Among them are the formation of band gaps [8][9][10][11] and the generation of gap solitons [12,13]. Magnonic crystals are also promising for practical applications, particularly for phase shifters [14] and generators [15], and they have also been suggested for use as temperature or magnetic field sensors [16,17].…”