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The purpose of this book is to provide a theoretical foundation and
an understanding of atomistic spin-dynamics (ASD), and to give
examples of where the atomistic Landau-Lifshitz-Gilbert equation
can and should be used. As argued in the text, a description of
magnetism in an atomistic way is very natural and allows for an
interpretation of experimental results in a clear and deep way.
This description also allows for calculations, from first
principles, of all parameters needed to perform the spin-dynamics
simulations, without using experimental results as input to the
simulations. As shown in the book, we are now at a very exciting
situation, where it is possible to perform accurate and efficient
atomistic simulations on a length- and time-scale which is
balancing on the edge of what is experimentally possible. In this
way, ASD simulations can both validate and be validated by
state-of-the art experiments, and ASD simulations also have the
possibility to act as a predictive tool that is able to explain the
magnetization dynamics in experimentally inaccessible situations.
The purpose of this book has been to communicate technically
relevant concepts. An even larger motivation is to communicate an
inspiration to magnetism and magnetization dynamics, and the
emerging technological fields that one may foresee, e.g. in
magnonics, solitonics and skyrmionics.
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