This book briefly looks at numerical modeling and micromagnetic simulation results of magnonic crystals, which are periodically modulated magnonic devices regarded as the magnetic counterpart of photonic crystals with spin waves acting as the information carrier. Since the wavelength of the spin wave is several orders of magnitude shorter than that of electromagnetic waves of the same frequency, magnonic crystals are promising candidates for miniaturization, especially in the fields of data storage and processing. The book begins by describing the dispersion relation of dipolar spin waves in a magnonic curved waveguide, solving Walker's equation in cylindrical coordinates, and then calculating the dispersion of exchange spin waves using perturbation theory. It describes simulated nano-contact-driven spin wave excitations in a magnonic cavity, featuring a design of an antidot magnonic crystal around the nano-contact, with the frequency of the spin wave mode generated lying within the band gap of the magnonic crystal. The proposed device behaves as a SWASERSpin Wave Amplification by the Stimulated Emission of Radiation. This book will find interest among researchers and practitioners interested in the modeling, simulation, and design of novel magnonic devices.

Autorentext

Dr. Nikhil Kumar C S received his B.Tech in Electronics and Communication Engineering from the IES College of Engineering, University of Calicut, Kerala in 2007 and was awarded his Master of Science by Research in Electrical Engineering, IIT Madras in 2014 with a thesis titled Analytical models for magnonic devices and with his Doctor of Philosophy in Electrical Engineering, IIT Madras in 2020 with a thesis titled Magnonic Devices with Feedback Stabilization. His research interests are in the areas of Magnonic Devices, Spin Torque Devices, Magnon Spintronic Devices.

Inhalt
Introduction.- Backward Volume Spin Waves in a Rectangular Geometry.- Magnetostatic Waves in Magnonic Crystals: A PWM Approach.- Field Localization in Striped Magnonic Crystal Waveguide.- Walkers Solution for Curved Magnonic Waveguide and Resonant Modes in Magnonic Ring.- Nano-contact Driven Spin Wave Excitations in Magnonic Cavity.- Magnetic Field Feedback Oscillator: A Micromagnetic Study.