The 2020 Magnetism Roadmap

Following the success and relevance of the 2014 and 2017 Magnetism Roadmap articles, this 2020 Magnetism Roadmap edition takes yet another timely look at newly relevant and highly active areas in magnetism research. The overall layout of this article is hereby unchanged, given that it is very suitable to convey the most relevant aspects of today's magnetism research in a wide variety of sub-fields to a broad readership. Again, a different group of experts has been selected, representing both the novelty of new research areas as well as the desire to incorporate different voices and viewpoints. The latter is especially relevant for this type of article, in which one's field of expertise has to be accommodated on two printed pages only, so that personal selection preferences are naturally rather more visible than in other types of articles. Most importantly, the very relevant advances in the field of magnetism research during the past years make yet another Magnetism Roadmap a very sensible and timely endeavour, and allow its authors and readers to take another broad-based, but concise look at the most significant developments in magnetism, their precise status, their challenges and their anticipated future developments.