Antiferromagnets prove their potential for spin-based information technology

As published in the online science journal Nature Communications, scientists at the Institute of Phyics at Johannes Gutenberg University Mainz (JGU) were now able to demonstrate current-induced switching of the Néel vector also for metallic thin films of a compound consisting of manganese and gold, Mn₂Au, which orders antiferromagnetically at high temperatures. In particular, they measured a ten times larger magnetoresistance as observed for CuMnAs. The surprising magnitude of this effect is explained by extrinsic scattering on excess gold atoms, as deduced from calculations done by Libor Šmejkal, who in the framework of a collaboration with the Czech Academy of Sciences is currently conducting his PhD project in the group of Professor Jairo Sinova at Mainz University. "These calculations are very important for the understanding of our experimental work mainly performed by Stanislav Bodnar, who is a PhD student in our group. We identified Mn₂Au as a prime candidate for enabling future antiferromagnetic spintronics," explained PD Dr. Martin Jourdan, project leader of the study. "Aside from the large magnetoresistance of this compound, other important advantages are its non-toxic composition and the fact that it can be used even at higher temperatures."

Spintronics is a major field of research at the Institute of Physics at Johannes Gutenberg University Mainz, mainly pursued in the groups of Professor Jairo Sinova (theory) and Professor Mathias Kläui (experiment). The study was financially supported by the Transregional Collaborative Center Spin+X of TU Kaiserslautern and Johannes Gutenberg University Mainz.