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Author: Felser, Claudia × Subject: Spintronics ×

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    Antiskyrmions and their electrical footprint in crystalline mesoscale structures of Mn1.4PtSn
    (London : Springer Nature, 2022) Winter, Moritz; Goncalves, Francisco J. T.; Soldatov, Ivan; He, Yangkun; Zúñiga Céspedes, Belén E.; Milde, Peter; Lenz, Kilian; Hamann, Sandra; Uhlarz, Marc; Vir, Praveen; König, Markus; Moll, Philip J. W.; Schlitz, Richard; Goennenwein, Sebastian T. B.; Eng, Lukas M.; Schäfer, Rudolf; Wosnitza, Joachim; Felser, Claudia; Gayles, Jacob; Helm, Toni
    Skyrmionic materials hold the potential for future information technologies, such as racetrack memories. Key to that advancement are systems that exhibit high tunability and scalability, with stored information being easy to read and write by means of all-electrical techniques. Topological magnetic excitations such as skyrmions and antiskyrmions, give rise to a characteristic topological Hall effect. However, the electrical detection of antiskyrmions, in both thin films and bulk samples has been challenging to date. Here, we apply magneto-optical microscopy combined with electrical transport to explore the antiskyrmion phase as it emerges in crystalline mesoscale structures of the Heusler magnet Mn1.4PtSn. We reveal the Hall signature of antiskyrmions in line with our theoretical model, comprising anomalous and topological components. We examine its dependence on the vertical device thickness, field orientation, and temperature. Our atomistic simulations and experimental anisotropy studies demonstrate the link between antiskyrmions and a complex magnetism that consists of competing ferromagnetic, antiferromagnetic, and chiral exchange interactions, not captured by micromagnetic simulations.
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    Different types of spin currents in the comprehensive materials database of nonmagnetic spin Hall effect
    (London : Nature Publ. Group, 2021) Zhang, Yang; Xu, Qiunan; Koepernik, Klaus; Rezaev, Roman; Janson, Oleg; Železný, Jakub; Jungwirth, Tomáš; Felser, Claudia; van den Brink, Jeroen; Sun, Yan
    Spin Hall effect (SHE) has its special position in spintronics. To gain new insight into SHE and to identify materials with substantial spin Hall conductivity (SHC), we performed high-precision high-throughput ab initio calculations of the intrinsic SHC for over 20,000 nonmagnetic crystals. The calculations revealed a strong relationship between the magnitude of the SHC and the crystalline symmetry, where a large SHC is typically associated with mirror symmetry-protected nodal line band structures. This database includes 11 materials with an SHC comparable to or even larger than that of Pt. Materials with different types of spin currents were additionally identified. Furthermore, we found that different types of spin current can be obtained by rotating applied electrical fields. This improves our understanding and is expected to facilitate the design of new types of spin-orbitronic devices.