Nanowerk July 13, 2023
Contrary to topological insulators, topological semimetals possess a nontrivial chiral anomaly that leads to negative magnetoresistance and host to both conductive bulk states and topological surface states with intriguing transport properties for spintronics. Researchers at the University of Minnesota fabricated highly ordered metallic Pt3Sn and Pt3SnxFe1-x thin films via sputtering technology. Systematic angular dependence (both in-plane and out-of-plane) study of magnetoresistance presented surprisingly robust quadratic and linear negative longitudinal magnetoresistance features for Pt3Sn and Pt3SnxFe1-x, respectively. They attributed the anomalous negative longitudinal magnetoresistance to the type-II Dirac semimetal phase (pristine Pt3Sn) and/or the formation of tunable Weyl semimetal phases through symmetry breaking processes. Pt3Sn and Pt3SnxFe1-x showed the promising performance for facilitating the development of advanced spin-orbit torque devices. According to the researcher their results extend the understanding of chiral anomaly of topological semimetals and can pave the way for exploring novel topological materials for spintronic devices…. read more. Open Access TECHNICAL ARTICLE
Characterization and physical origin of robust NLMR. Credit: Nature Communications volume 14, Article number: 4151 (2023)