Transregional Collaborative Research Center (SFB/TRR) 173 Spin+X combines the expertise of research groups in physics, chemistry, and mechanical and process engineering to form a coherent platform dedicated to advanced spin engineering. Spin+X is organized into two research areas and directed towards four related goals.
All Spin+X research projects are connected through a
network of Supply Chains. The theory projects are additionally organized in the Spin+X Interdisciplinary Theory Network (Spin+ITN).

Spin is the internal angular momentum of elementary particles. It determines, for instance, quantum statistics and the electronic structure of atoms and molecules. It is the basic ingredient of magnetism and underlies many chemical phenomena. Hence, spin is the subject of research ranging from the fundamental realm of spins in molecules and solids to the development of complex spintronics device structures and magnetic sensors. TU Kaiserslautern and Johannes Gutenberg-Universität Mainz stand out, in particular, for the depth and breadth of their research activities in this field.

While many fundamental questions in the field of spin phenomena still remain open, spin is already a key component in modern technology such as data storage devices and magnetic sensors. The macroscopic effects of these diverse magnetic phenomena can often be described in terms of classical physics, but they all arise microscopically from the same small set of quantum mechanical spin-spin and spin-orbit interactions. However, most of these interesting spin phenomena do not arise directly from individual spin-spin or spin-orbit interactions, but instead are a consequence of collective interactions in large systems: they are emergent spin phenomena. The understanding of many novel collective phenomena involving spin is still in its infancy; the title Spin+X refers to the extension of spin physics into the terra incognita of emergent spin phenomena, with the intermediate and long-term goal of practical applications.

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