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Abstract
The topological Hall effect (THE) is the Hall response to an emergent magnetic field, a manifestation of the skyrmion Berry-phase. As the magnitude of THE in magnetic multilayers is an open question, it is imperative to develop comprehensive understanding of skyrmions and other chiral textures, and their electrical fingerprint. Here, using Hall-transport and magnetic-imaging in a technologically viable multilayer film, we show that topological-Hall resistivity scales with the isolated-skyrmion density over a wide range of temperature and magnetic-field, confirming the impact of the skyrmion Berry-phase on electronic transport. While we establish qualitative agreement between the topological-Hall resistivity and the topological-charge density, our quantitative analysis shows much larger topological-Hall resistivity than the prevailing theory predicts for the observed skyrmion density. Our results are fundamental for the skyrmion-THE in multilayers, where interfacial interactions, multiband transport and non-adiabatic effects play an important role, and for skyrmion applications relying on THE.
The topological Hall Effect (THE) enhances our understanding of chiral spin textures such as skyrmions, but important aspects of the relationship are still unclear. Here the authors present a comprehensive picture for the spin texture evolution and corresponding THE signatures in a multilayer film using Hall transport and magnetic imaging.
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1 Nanyang Technological University, Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Singapore, Singapore (GRID:grid.59025.3b) (ISNI:0000 0001 2224 0361)
2 Technion, Department of Physics, Haifa, Israel (GRID:grid.6451.6) (ISNI:0000000121102151)
3 Agency for Science, Technology and Research (A*STAR), Data Storage Institute, Singapore, Singapore (GRID:grid.185448.4) (ISNI:0000 0004 0637 0221); Agency for Science, Technology and Research, Institute of Materials Research and Engineering, Singapore, Singapore (GRID:grid.185448.4) (ISNI:0000 0004 0637 0221)
4 Agency for Science, Technology and Research (A*STAR), Data Storage Institute, Singapore, Singapore (GRID:grid.185448.4) (ISNI:0000 0004 0637 0221); JJ Thomson Avenue, Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom (GRID:grid.5335.0) (ISNI:0000000121885934)