Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/111615
Title: Topological Hall effect arising from the mesoscopic and microscopic non-coplanar magnetic structure in MnBi
Authors: He, Y.
Schneider, S.
Helm, T.
Gayles, J.
Wolf, D.
Soldatov, I.
Borrmann, H.
Schnelle, W.
Schaefer, R.
Fecher, G. H.
Rellinghaus, B.
Felser, C.
Issue Date: 2022
Publisher: Acta Materialia Inc
Elsevier BV
Citation: Topological Hall effect arising from the mesoscopic and microscopic non-coplanar magnetic structure in MnBi / Y. He, S. Schneider, T. Helm et al. // Acta Materialia. — 2022. — Vol. 226. — 117619.
Abstract: The topological Hall effect (THE), induced by the Berry curvature that originates from non-zero scalar spin chirality, is an important feature for mesoscopic topological structures, such as skyrmions. However, the THE might also arise from other microscopic non-coplanar spin structures in the lattice. Thus, the origin of the THE inevitably needs to be determined to fully understand skyrmions and find new host materials. Here, we examine the Hall effect in both, bulk- and micron-sized lamellar samples of MnBi. The sample size affects the temperature and field range in which the THE is detectable. Although a bulk sample exhibits the THE only upon exposure to weak fields in the easy-cone state, in micron-sized lamella the THE exists across a wide temperature range and occurs at fields near saturation. Our results show that both the non-coplanar spin structure in the lattice and topologically non-trivial skyrmion bubbles are responsible for the THE, and that the dominant mechanism depends on the sample size. Hence, the magnetic phase diagram for MnBi is size-dependent. Our study provides an example in which the THE is simultaneously induced by two mechanisms, and builds a bridge between mesoscopic and microscopic magnetic structures. © 2022.
Keywords: MNBI
NONCOPLANAR SPIN STRUCTURE
SKYRMION BUBBLE
TOPOLOGICAL HALL EFFECT
BINARY ALLOYS
BISMUTH ALLOYS
SPIN HALL EFFECT
SUPERCONDUCTING MATERIALS
TOPOLOGY
IMPORTANT FEATURES
MESOSCOPICS
NON-COPLANAR
NONCOPLANAR SPIN STRUCTURE
SAMPLE SIZES
SKYRMION BUBBLE
SKYRMIONS
SPIN CHIRALITY
SPIN STRUCTURES
TOPOLOGICAL HALL EFFECT
MANGANESE ALLOYS
URI: http://hdl.handle.net/10995/111615
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85122485930
PURE ID: 29375965
ISSN: 1359-6454
metadata.dc.description.sponsorship: This work was financially supported by an Advanced Grant from the European Research Council (No. 742068 ) “TOPMAT,” the European Union's Horizon 2020 research and innovation programme (No. 824123 ) “SKYTOP,” the European Union's Horizon 2020 research and innovation programme (No. 766566 ) “ASPIN,” the Deutsche Forschungsgemeinschaft (Project-ID 258499086) “SFB 1143,” the Deutsche Forschungsgemeinschaft (Project-IDs FE 633/30-1, RE 1164/6-1 and LU 2261/2-1) “SPP Skyrmionics,” the DFG through the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter ct.qmat (EXC 2147, Project-ID 39085490). I.S. is grateful to Deutsche Forschungsgemeinschaft for supporting this work through project SO 1623/2-1. D.W. has received funding from the European Research Council (ERC) under the Horizon 2020 research and innovation program of the European Union (grant agreement number 715620 ).
CORDIS project card: H2020: 715620
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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