Reciprocal Damon-Eshbach-type spin wave excitation in a magnonic crystal due to tunable magnetic symmetry

Abstract

We report spin-wave (SW) propagation in a one-dimensional magnonic crystal (MC) explored by all electrical spectroscopy. The MC consists of a periodic array of 255 nm wide permalloy nanowires with a small edge-to-edge separation of 45 nm. Provoking antiparallel alignment of the magnetization of neighboring nanowires, we unexpectedly find reciprocal excitation of Damon-Eshbach type SWs. The characteristics are in contrast to ferromagnetic thin films and controlled via, both, the external magnetic field and magnetic states. The observed reciprocal excitation is a metamaterial property for SWs and attributed to the peculiar magnetic symmetry of the artificially tailored magnetic material. The findings offer great perspectives for nanoscale SW interference devices.

Spin Waves Along the Edge States

“…Remarkably, the one dimensional (1D) character of these SW is qualitatively distinct from those observed previously for SWs in 1D magnonic crystals (Ref. 14), 2D SW diffraction (Refs. 15 and 16) or SW interference patterns from point contact spin torque emitters.…”

Spin waves in CoFeB on ferroelectric domains combining spin mechanics and magnonics

“…Reconfigurable magnonic crystals [1,2,3,4,5,6] and meta-materials [7] operating in the GHz frequency regime have attracted great interest recently. Periodically patterned ferromagnets [ Fig.…”

Microwave magnetic dynamics in ferromagnetic metallic nanostructures lacking inversion symmetry

“…[1][2][3][4][5][6][7][8][9][10][11][12]). These materials are important for the emerging fields of magnonics [13], microwave spintronics [14][15][16][17], and for novel sensor applications [18][19][20][21].Macroscopically-long stripes with sub-micron cross-section made of ferromagnetic materials have attracted a lot of attention, because this geometry is a very convenient model object for studying the impact of geometric confinement on magnetization dynamics on the sub-micrometre and nanometer scales [22][23][24][25][26][27][28][29][30]. The main reasons for the attractiveness of this geometry are the practical absence of a static demagnetizing field H ds when the external field is applied along the stripes (i.e.…”