Bias field orientation driven reconfigurable magnonics and magnon−magnon coupling in triangular shaped Ni₈₀Fe₂₀ nanodot arrays

Abstract

Reconfigurable magnonics has attracted intense interest due to their myriad advantages including energy efficiency, easy tunability and miniaturization of on-chip data communication and processing devices. Here, we demonstrate efficient reconfigurability of spin-wave dynamics as well as spin-wave avoided crossing by varying bias magnetic field orientation in triangular shaped Ni80Fe20 nanodot arrays. Particularly, for a range of in-plane angle of bias field, we have achieved mutual coherence between two lower frequency modes leading to a drastic modification in the ferromagnetic resonance frequency. Significant modification in magnetic stray field distribution is observed at the avoided crossing regime due to anisotropic dipolar interaction between two neighbouring dots. Furthermore, using micromagnetic simulations we demonstrate that the hybrid spin wave (SW) modes propagate longer through an array as opposed to the non-interacting modes present in this system, indicating the possibility of coherent energy transfer of hybrid magnon modes. This result paves way for the development of integrated on-chip magnonic devices operating in gigahertz frequency regime.

Using magnons as a quantum technology platform: a perspective

“…Recognizing these challenges, the field underwent a transition towards nanoscale magnonics, driven by the aspiration for enhanced miniaturization and compatibility with complementary metal-oxidesemiconductor technology. In response to the identified gaps in current research, recent literature has made substantial strides in unveiling the intricate phenomenon of magnon-magnon coupling within irregularly shaped hexagonal dots [50], triangular [61], diamond nanodots [62], cross-shaped nanomagnets [63][64][65], and nanoring arrays [66]. These investigations represent a pivotal advancement towards bridging the existing knowledge deficiencies in the field.…”

Tunable strong magnon-magnon coupling in two-dimensional array of diamond shaped ferromagnetic nanodots

“…In the last decade, extensive studies have been done using both confined and propagating magnons in the field of magnonics, which emerged as an exciting field of research. To this end single nanomagnets have been studied extensively due to their geometrically confined rich volume and localized magnetic modes [25][26][27][28][29][30][31] in nanometer dimension and their tunability with different external parameters. Therefore, such systems possess great potential in quantum magnonics with the possibility of developing magnon-based on-chip quantum information processing systems in the GHz and THz frequency range with high energy efficiency.…”

Active Control of Dipole-Exchange Coupled Magnon Modes in Nanoscale Bicomponent Magnonic Crystals

“…During the past two decades, fundamental research on nanoscale magnonics has demonstrated great promise in developing next-generation high-speed and energy-efficient technology. Novel nanopatterned magnetic structures have emerged as the elevators for upsurging this exciting research field. − Magnonics render several prime advantages, e.g., shorter wavelength of spin-wave (SW) or magnon, large scalability, nonreciprocity, waveguiding property, nonlinearity, anisotropic dispersion, reconfigurable band structure, and hybridization with other quasi-particles, leading to the possibility of its myriad applications. − These potential applications of magnonics are envisaged with low-loss sustainability, such as SW filter, − transistor, , phase shifter, multiplexer, logic gates, − directional couplers, memory, SW diodes, − and nonreciprocal devices in addition to wave-based computing, , signal processing, and more recently in neuromorphic computing. − Such rapid progress toward future technology demands the exploration of fundamental physics in a variety of systems including bi- and multicomponent magnonic crystals, which may provide perfect testbeds for tuning the dipole-exchange coupling of the nanomagnets.…”