Magneto-Plasmonic Magnonics: Spin Wave Manipulation and Topological Magnonic and Photonic Crystals
Abstract
Magnonics investigates the use of spin waves to transmit, store, and process information in a fast, compact and efficient way. Compared to current technologies, it offers lower energy consumption, re-programmability, nanoscale footprint and efficient magnon control and tunability by various external stimuli. The key challenges for magnonics applications are the excitation of <100nm wavelengthmagnons, their temporal and spatial manipulation on the THz and the nanoscale, as well as the limitation of available magnetic materials with low-Gilbert damping constants. Garnets are the most utilized materials; however, their low magnetic anisotropy, challenging synthesis and incompatibility with CMOS processing, hinders the implementation of magnonic devices. Topological Magnonics is a field of great interest as it could enable the transmission of information by spin waves without dissipative losses. Topological systems are robust against perturbations including backscattering, thus reducing the loss of the transmitted information content. To advance magnonics, the objectives of this proposal are to implement novel schemes for efficient spin wave excitation at the nanoscale, spin wave damping-compensation to achieve long-distance propagation, on-demand spin-wave steering and guiding in magnetic structures that are reconfigurable in ultra-fast time scales.OBJECTIVES: The overarching goal of this proposal is to investigate the generation, control and transport of magnon excitations in ferrimagnetic insulators driven my ultrashort magnetic fields derived from optically excited nanoscale magneto-plasmonic resonators (MPR). The objectives are: 1) design and realization of a Magneto-Plasmonic Magnonics (MPM) platform comprising MPR arrays coupled to a ferrimagnetic insulator waveguide for the nanoscale excitation of spin waves, their long-range propagation and steering; 2) implementation of MPR-based ultrafast, reconfigurable magnonic crystals to generate topologically protectedchiral states to transport spin waves without dissipation losses, to realize topological photonic devices and tod realizing of novel devices based on the generation, propagation and interactions of magnons in ferrimagnetic insulators with ultrafast, photonically-generated magnetic fields and thermal landscapes. The research opens new possibilities for advancing waveform coms the integration of magnonic devices in quantum engineering as magnons provide extensive tunability and flexibility for interaction with various quantum modules. OUTLINE: Two interconnected thrpagation and wave interference of magnon excitations launched in ferrimagnetic insulator waveguides by transient magnetic fields produced by fs laser pulses in hybrid magneto-plasmonic nanostructured arrays. Thrust 2 will utilize the MPR arrays to create magnonicand photonic crystals with modulated magnetic properties in ferrimagnetic insulators to generate symmetry protected edge states forthe unidirectional, dissipation free propagation of spin waves and photons. BROADER IMPACTS AND DoD RELEVANCE: The knowledge gainedfrom the proposed research will impact a broad community of scientists, engineers and the general public. Its outcomes are directlyapplicable to the development of novel devices for computational and data processing technologies. It will provide hands-on training to the next generation of scientists and engineers for DoD agencies and laboratories. This innovative research program will contribute to the ONRs mission to develop a new generation of combat devices/systems that are efficient, compact, versatile, and multifunctional.Approved for Public Release
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 05, 2021
- Source ID
- N000142112562
Entities
People
- Ernesto E. Marinero
Organizations
- Office of Naval Research
- Purdue University
- United States Navy