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arXiv · 2305.05801

Robust negative longitudinal magnetoresistance and spin-orbit torque in sputtered Pt3Sn topological semimetal

Delin Zhang·Wei Jiang·Hwanhui Yun·Onri Jay Benally·Thomas Peterson·Zach Cresswell·Yihong Fan·Yang Lv·Guichuan Yu·Javier Garcia Barriocanal·Przemyslaw Swatek·K. Andre Mkhoyan·Tony Low·Jian-Ping Wang
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Abstract

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.

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Delin Zhang, Wei Jiang, Hwanhui Yun, Onri Jay Benally, Thomas Peterson, Zach Cresswell, Yihong Fan, Yang Lv, Guichuan Yu, Javier Garcia Barriocanal, Przemyslaw Swatek, K. Andre Mkhoyan, Tony Low, Jian-Ping Wang. 2023-05-09. Robust negative longitudinal magnetoresistance and spin-orbit torque in sputtered Pt3Sn topological semimetal. https://doi.org/10.1038/s41467-023-39408-2

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