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Contrary to topological insulators, topological semimetals possess a nontrivial chiral anomaly that leads to negative magnetoresistance and are hosts to both conductive bulk states and topological surface states with intriguing transport properties for spintronics. Here, we fabricate 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 presents surprisingly robust quadratic and linear negative longitudinal magnetoresistance features for Pt3Sn and Pt3SnxFe1-x, respectively. We attribute 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, such as magnetic-atom doping, as confirmed by first-principles calculations. Furthermore, Pt3Sn and Pt3SnxFe1-x show the promising performance for facilitating the development of advanced spin-orbit torque devices. These results extend our understanding of chiral anomaly of topological semimetals and can pave the way for exploring novel topological materials for spintronic devices.
Bibliographical noteFunding Information:
This project is supported by SMART, one of seven centers of nCORE, a Semiconductor Research Corporation program, sponsored by National Institute of Standards and Technology (NIST). T.P. and D.Z. were partly supported by ASCENT, one of six centers of JUMP, a Semiconductor Research Corporation program that is sponsored by MARCO and DARPA. This work was partially supported by the UMN MRSEC program under award number DMR-2011401 (Seed). Parts of this work were carried out in the Characterization Facility of the University of Minnesota, which receives partial support from the NSF through the MRSEC (Award Number DMR-2011401). Portions of this work were conducted in the Minnesota Nano Center, which is supported by the National Science Foundation Nano Coordinated Infrastructure Network (NNCI) under Award Number ECCS-2025124. J.P.W. and D.Z. are grateful for the useful discussions with former Nanomagnetism and Quantum Spintronics group members at UMN: Dr. Mahendra D.C. and Dr. Lakhan Bainsla.
© 2023, The Author(s).
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