Advanced micromagnetic modeling of nanostructured materials and devices
Dr. Vitaliy Lomakin
Department of Electrical and Computer Engineering
University of California, San Diego
Date & Time: 15:00 - 16:00, May 7th (Tue), 2019.
Place: 8F Medium Seminar Room(#811-812), Sengen.
Abstract:
This talk presents our recent work on the development of micromagnetic simulator frameworks and their use for modeling of magnetic material and devices. We demonstrate a high-performance FEM-based micromagnetic simulator (FastMag) suitable for modeling complex micromagnetic systems. We present the underlying physics formulations, including the Landau-Lifshitz-Gilbert (LLG) equation, Valet-Fert spin accumulation model with spin Hall effect, spin diffusion model, coupled LLG – Maxwell equations formulation for eddy current – magnetization dynamics, nudged elastic band method for computing energy barriers, and lambda model for describing all-optical switching phenomena. We discuss some of the numerical implementation aspects that make FastMag efficient and robust, including efficient methods for computing effective magnetic fields, efficient methods for non-linear time integrations, and massive parallelization. We show a set of simulation examples demonstrating the use of the developed micromagnetic tools for modeling various materials and devices, including magnetic recording media and heads, magnetic random access memories, all-optical switching in granular and continuous media, computing hysteresis loops, and modeling general magnetization dynamics.