Research Projects

spin-wave dynamics in three-dimensional (3D) magnetic nanostructures is essential for the advancement of low-power spintronic devices. Unlike conventional 2D systems, 3D architecture offers increased geometric complexity and additional degrees of freedom, which significantly enhance the functionality and versatility of spin waves. When spin waves propagate in 3D, they require specialized waveguides that can efficiently channel energy across all spatial directions. For optimal performance, these waveguides must be precisely engineered to minimize decay and maximize propagation length. Crucially, this depends on material composition, geometry, and size parameters that need to be systematically studied to enable future 3D spintronic and magnonic technologies. Therefore, a comprehensive understanding of spin-wave dynamics in 3D environments is not just desirable but necessary. In this project, we aim to address the following key scientific questions: • How can we reliably grow three-dimensional magnetic nanostructures using chemical synthesis methods? • How does the introduction of a third dimension modify the magnetic ground state and domain structures of these systems? • What are the key differences in spin-wave dynamics between 2D and 3D magnetic nanostructures? • How is it possible to use the 3D magnetic nanostructures as future low-power consumed spintronic and magnonic devices by varying the shape and size of it? • How can we develop and apply computational tools to accurately analyze and interpret experimental data on 3D spin-wave dynamics? However, fabricating 3D magnetic nanostructures with high precision, scalability, and reproducibility remains a major challenge. Existing methods like FEBID and TPL are limited by high costs and material constraints, and such advanced facilities are not widely available in the Indian context. To overcome these barriers, this project adopts a cost-effective, interdisciplinary approach combining innovative chemical synthesis, smart measurement techniques, and robust data analysis. Specifically, we will: • Fabrication of 3D magnetic nanostructures using chemically synthesized covalent organic frameworks. These porous crystalline polymers will be used as scaffolds, enabling controlled dispersion of magnetic nanoparticles within their columnar pores. We will use a top-down approach to stack 2D COF sheets via non-covalent interactions, forming well-ordered 3D architectures. This methodology allows us to engineer three-dimensional waveguides of varying shapes and sizes. • Magnetic imaging of static properties using Magnetic Force Microscope. By tilting the sample and applying external magnetic fields, we will gain insight into the internal magnetic texture and domain evolution in 3D nanostructures • Spin-wave dynamics characterization using ferromagnetic resonance. The setup will use radio-frequency excitation and enable full 360° rotation of both the sample and magnetic field, facilitating a complete 3D analysis of spin-wave propagation. We will investigate how spin-wave transmission varies with the nanotustructure's shape, size, and explore modulation mechanisms in twisted spin-wave waveguides. • Development of a computational toolkit to simulate and analyze the experimentally observed spin-wave dynamics in 3D nanostructures, helping interpret data and guide future design. Aim of the project: The primary objective of this project is to investigate the spin-wave dynamics in chemically synthesized three-dimensional magnetic nanostructures of varying shapes, sizes and twisted geometries fabricated using COFs as templates. By characterizing their spin wave dynamic and understanding how spin information is transmitted through these 3D structures, we aim to establish a robust foundation for future applications in low-power spintronic and magnonic devices. This project will be in collaboration with Dr. Deepak Asthana, faculty of the Department of Chemistry, Ashoka University