Topological Hall effect arising from the mesoscopic and microscopic non-coplanar magnetic structure in MnBi

He, Yangkun; Schneider, Sebastian; Helm, Toni; Gayles, Jacob; Wolf, Daniel; Soldatov, Ivan; Borrmann, Horst; Schnelle, Walter; Schaefer, Rafael F.; Fecher, Gerhard H.; Rellinghaus, Bernd; Felser, Claudia

doi:10.1016/j.actamat.2022.117619

Cited by 16 publications

(13 citation statements)

References 38 publications

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“…Comparison of maximum topological Hall resistivity obtained in the present work with previously reported values. ,,,− We have listed the experimental conditions of each material when they reach their maximum topological Hall resistivity.…”

Section: Resultssupporting

confidence: 62%

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Giant Topological Hall Effect in the Noncollinear Phase of Two-Dimensional Antiferromagnetic Topological Insulator MnBi₄Te₇

et al. 2021

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Magnetic topological insulators provide an important platform for realizing several exotic quantum phenomena, such as the axion insulating state and the quantum anomalous Hall effect, owing to the interplay between topology and magnetism. MnBi 4 Te 7 is a two-dimensional Z 2 antiferromagnetic (AFM) topological insulator with a Neél temperature of ∼13 K. In AFM materials, the topological Hall effect (THE) is observed owing to the existence of nontrivial spin structures. A material with noncollinearity that develops in the AFM phase rather than at the onset of the AFM order is particularly important. In this study, we observed that such an unanticipated THE starts to develop in a MnBi 4 Te 7 single crystal when the magnetic field is rotated away from the easy axis (c-axis) of the system. Furthermore, the THE resistivity reaches a giant value of ∼7 μΩ-cm at 2 K when the angle between the magnetic field and the c-axis is 75°. This value is significantly higher than the values for previously reported systems with noncoplanar structures. The THE can be ascribed to the noncoplanar spin structure resulting from the canted state during the spinflip transition in the ground AFM state of MnBi 4 Te 7 . The large THE at a relatively low applied field makes the MnBi 4 Te 7 system a potential candidate for spintronic applications.

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Section: Resultssupporting

confidence: 62%

“…Surprisingly, a giant topological Hall resistivity (ρ yx T ) of ∼ 7 μΩ-cm is observed at 2 K, which is significantly higher than any previously reported value (Figure ). ,,,− This makes the MnBi 4 Te 7 system a potential candidate for spintronic applications.…”

Section: Resultsmentioning

confidence: 99%

Giant Topological Hall Effect in the Noncollinear Phase of Two-Dimensional Antiferromagnetic Topological Insulator MnBi₄Te₇

et al. 2021

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“…However, it remains unclear which spin configuration generates the Berry phase, leading to the THE in many magnetic systems. Recently, He et al reported that the THE in bulk and mesoscopic MnBi samples have different origins . For bulk samples, the THE is associated with the easy-cone spin configurations, while for a thin device, the THE originates from the formation of skyrmionic bubbles.…”

Section: Resultsmentioning

confidence: 99%

Magnetic Skyrmionic Bubbles at Room Temperature and Sign Reversal of the Topological Hall Effect in a Layered Ferromagnet Cr_0.87Te

Ding

Liang

et al. 2022

ACS Nano

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The search for materials that exhibit topologically protected spin configurations, such as magnetic skyrmions, continues to be fueled by the promise of outstanding candidate components for spin-based applications. In this study, in situ Lorentz transmission electron microscopy directly images Bloch-type magnetic skyrmionic bubbles in a layered ferromagnet Cr0.87Te single crystal. Owing to the competition between a magnetic dipole interaction and uniaxial easy axis anisotropy, nanoscale magnetic bubbles with random chirality can be observed in a wide temperature range covering room temperature when the external magnetic field is applied along the out-of-plane direction. Moreover, high-density and stable skyrmionic bubbles are successfully realized at zero magnetic field by appropriate field-cooling manipulation. Additionally, a sign reversal of the Hall effect and the derived topological Hall effect is observed and discussed. As quasi-two-dimensional materials, the binary chromium tellurides hosting magnetic skyrmions could have many applications in low-dimensional skyrmion-based spintronic devices in an ambient atmosphere.

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“…Our studies of transport, magnetization, and ferromagnetic resonance reveal a semi-hard-magnetic phase, and, hence, the unique link of ASKs to anisotropies, not possible in the cubic B20 compounds with weak anisotropy. We find this semi-hard-magnetic behavior to strengthen as we reduce the thickness of the sample, which is particularly interesting for scalable electronic devices [46][47][48] . Many hard-magnetic materials are strongly susceptible to finite sizes and may display nontrivial magnetic textures detectable by Hall transport 24,49 .…”

Section: Discussionmentioning

confidence: 80%

Antiskyrmions and their electrical footprint in crystalline mesoscale structures of Mn1.4PtSn

et al. 2022

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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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Topological Hall effect arising from the mesoscopic and microscopic non-coplanar magnetic structure in MnBi

Cited by 16 publications

References 38 publications

Giant Topological Hall Effect in the Noncollinear Phase of Two-Dimensional Antiferromagnetic Topological Insulator MnBi₄Te₇

Giant Topological Hall Effect in the Noncollinear Phase of Two-Dimensional Antiferromagnetic Topological Insulator MnBi₄Te₇

Magnetic Skyrmionic Bubbles at Room Temperature and Sign Reversal of the Topological Hall Effect in a Layered Ferromagnet Cr_0.87Te

Antiskyrmions and their electrical footprint in crystalline mesoscale structures of Mn1.4PtSn

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Topological Hall effect arising from the mesoscopic and microscopic non-coplanar magnetic structure in MnBi

Cited by 16 publications

References 38 publications

Giant Topological Hall Effect in the Noncollinear Phase of Two-Dimensional Antiferromagnetic Topological Insulator MnBi4Te7

Giant Topological Hall Effect in the Noncollinear Phase of Two-Dimensional Antiferromagnetic Topological Insulator MnBi4Te7

Magnetic Skyrmionic Bubbles at Room Temperature and Sign Reversal of the Topological Hall Effect in a Layered Ferromagnet Cr0.87Te

Antiskyrmions and their electrical footprint in crystalline mesoscale structures of Mn1.4PtSn

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Giant Topological Hall Effect in the Noncollinear Phase of Two-Dimensional Antiferromagnetic Topological Insulator MnBi₄Te₇

Giant Topological Hall Effect in the Noncollinear Phase of Two-Dimensional Antiferromagnetic Topological Insulator MnBi₄Te₇

Magnetic Skyrmionic Bubbles at Room Temperature and Sign Reversal of the Topological Hall Effect in a Layered Ferromagnet Cr_0.87Te