All Electrical Access to Topological Transport Features in Mn${}_{1.8}$PtSn Films

Abstract

The presence of non-trivial magnetic topology can give rise to non-vanishing scalar spin chirality and consequently a topological Hall or Nernst effect. In turn, topological transport signals can serve as indicators for topological spin structures. This is particularly important in thin films or nanopatterned materials where the spin structure is not readily accessible. Conventionally, the topological response is determined by combining magnetotransport data with an independent magnetometry experiment. This approach is prone to introduce measurement artifacts. In this study, we report the observation of large topological Hall and Nernst effects in micropatterned thin films of Mn${}_{1.8}$PtSn below the spin reorientation temperature $T_{\mathrm{SR}}\approx 190$K. The magnitude of the topological Hall effect ${\rho }_{\mathrm{xy}}^{\mathrm{T}}=8$ n$\Omega$m is close to the value reported in bulk Mn${}_2$PtSn, and the topological Nernst effect $S_{\mathrm{xy}}^{\mathrm{T}}=115$ nV K${}^{-1}$ measured in the same microstructure has a similar magnitude as reported for bulk MnGe ($S_{\mathrm{xy}}^{\mathrm{T}}\sim 150$ nV K${}^{-1}$), the only other material where a topological Nernst was reported. We use our data as a model system to introduce a topological quantity, which allows to detect the presence of topological transport effects without the need for independent magnetometry data. Our approach thus enables the study of topological transport also in nano-patterned materials without detrimental magnetization related limitations.

arXiv comment8 pages, 3 figures

References in corpus (19)

• Berry Phase Effects on Electronic Properties
• Skyrmion Lattice in a Chiral Magnet
• Spontaneous Skyrmion Ground States in Magnetic Metals
• Topological Hall effect in the A-phase of MnSi
• Discovery of Magnetic Antiskyrmions Beyond Room Temperature in Tetragonal Heusler Materials
• Berry phase effect in anomalous thermoelectric transport
• Universal Scaling Behavior of Anomalous Hall Effect and Anomalous Nernst Effect in Itinerant Ferromagnets
• Berry Phase Theory of Anomalous Hall Effect: Application to Colossal Magnetoresistance Manganites
• Interface-driven topological Hall effect in SrRuO${}_3$-SrIrO${}_3$ bilayer
• Unusual Hall Effect Anomaly in MnSi Under Pressure
• Robust formation of skyrmions and topological Hall effect in epitaxial thin films of MnSi
• Magnetic structures and reorientation transitions in noncentrosymmetric uniaxial antiferromagnets
• Chirality driven anomalous Hall effect in weak coupling regime
• Current-Driven Dynamics of Skyrmions Stabilized in MnSi Nanowires Revealed by Topological Hall Effect
• Anomalous Hall Effect and Skyrmion Number in Real- and Momentum-space
• Robust Zero-Field Skyrmion Formation in FeGe Epitaxial Thin Films
• Large Noncollinearity and Spin Reorientation in the Novel Mn2RhSn Heusler Magnet
• Characterization of topological band structures away from the Fermi level by anomalous Nernst measurements
• Topological Hall effect in thin films of Mn${}_{1.5}$PtSn

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• Topological Nernst effect of the two-dimensional skyrmion lattice
• Observation of colossal topological Hall effect in noncoplanar ferromagnet Cr5Te6 thin films
• Thermoelectric signature of individual skyrmions
• Role of magnetic exchange interactions in chiral-type Hall effects of epitaxial Mn${}_x$PtSn films