Eduardo Mendive Tapia's first research experience was made possible by a Departmental Collaboration Fellowship at the University of Barcelona, where he also obtained his Bachelor in Physics. After completing a master on spintronics at the university of Nottingham, he started a PhD at the University of Warwick under the wise guidance of Prof. Julie B. Staunton. From her he learned deep aspects of the theory of magnetism at finite temperature, which inspired him to study multi-spin interactions and their use for solid-state cooling technology. Following a short-term DAAD grant to work at Forschungszentrum Jülich, Eduardo became a postdoctoral researcher at the Max-Planck-Institut in Düsseldorf, where he continues to research on magnetism and refrigeration.

• Introduction.- Ab-initio Theory of Electronic Structure.- Disordered Local Moment Theory and Fast Electronic Responses.- Minimisation of the Gibbs Free Energy: Magnetic Phase Diagrams and Caloric Effects.- Pair- and Four- Spin Interactions in the Heavy Rare Earth Elements.- Frustrated Magnetism in Mn-based Antiperovskite Mn3GaN.- Summary and Outlook.- Appendix.