Magnetization dynamics (T=400, slower)

Перенесено с https://youtube.com/shorts/FOsg172caJU (оригинальная дата публикации 27 марта 2012) This is magnetization dynamics simulation using my new program, called yaLLGs (yet another Landau-Lifshitz-Gilbert simulator). We start with horizontally (along X axis) magnetized slab and simulate the influence of time-varying uniform magnetic field Hx=Ms Cos[2 Pi t/T], where Ms is the saturation magnetization. The period T is 400 characteristic times (unit of time, renormalizing the gyromagnetic ration to 1, equal to 5.656ps for Permalloy). The slab has dimensions 50x50x5 exchange lengths, discretized into 200x200x1 finite elements. The texture is tangential to the in-plane components of magnetization, the color map shows the local energy density from blue (the lowest) to red (the highest). You can see a lot of micro- and nano-magnetics: domains, domain walls (simple and charged cross-ties), spin waves, creation and annihilation (accompanied by bursts of spin waves) of vortices and anti-vortices, scattering of spin-waves by domain walls and solitons, magnon-magnon interactions, and more sub-micron scale drama... ;-)

Видео Magnetization dynamics (T=400, slower) автора dr-klm