Chiral domain walls of Mn${}_3$Sn and their memory

Abstract

Magnetic domain walls are topological solitons whose internal structure is set by competing energies which sculpt them. In common ferromagnets, domain walls are known to be of either Bloch or Néel types. Little is established in the case of Mn${}_3$Sn, a triangular antiferromagnet with a large room-temperature anomalous Hall effect, where domain nucleation is triggered by a well-defined threshold magnetic field. Here, we show that the domain walls of this system generate an additional contribution to the Hall conductivity tensor and a transverse magnetization. The former is an electric field lying in the same plane with the magnetic field and electric current and therefore a planar Hall effect. We demonstrate that in-plane rotation of spins inside the domain wall would explain both observations and the clockwise or anticlockwise chirality of the walls depends on the history of the field orientation and can be controlled.

8 pages, 5 figures, Supplemental Material is included

References in corpus (7)

• Topological Weyl semimetals in the chiral antiferromagnetic materials Mn3Ge and Mn3Sn
• Non-collinear Antiferromagnets and the Anomalous Hall Effect
• Cluster multipole theory for anomalous Hall effect in antiferromagnets
• The 2014 Magnetism Roadmap
• The nature of domain walls in ultrathin ferromagnets revealed by scanning nanomagnetometry
• Real-Space Berry Phases - Skyrmion Soccer
• Comparing the anomalous Hall effect and the magneto-optical Kerr effect through antiferromagnetic phase transitions in Mn${}_3$Sn

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• Large topological Hall effect near room temperature in noncollinear ferromagnet LaMn2Ge2 single crystal
• Nanoscale magnetic domains in polycrystalline Mn3Sn films imaged by a scanning single-spin magnetometer
• Chiral Spin Textures for Next-Generation Memory and Unconventional Computing
• Distinct quantum anomalous Hall ground states induced by magnetic disorders
• Tuning of topological properties in the strongly correlated antiferromagnet Mn${}_3$Sn via Fe doping
• Planar Hall effect caused by the memory of antiferromagnetic domain walls in Mn${}_3$Ge
• Dzyaloshinskii-Moriya Induced Spin-Transfer Torques in Kagome Antiferromagnets
• Magnetic interactions in AB-stacked kagome lattices: magnetic structure, symmetry, and duality
• Tuning of Electrical, Magnetic, and Topological Properties of Magnetic Weyl Semimetal Mn${}_{3+x}$Ge by Fe doping
• Evidence of magnetoelectronic electromagnon mediated transport in flexoelectronic heterostructures
• Unusual Multiple Magnetic Transitions and Anomalous Hall Effect Observed in Antiferromagnetic Weyl Semimetal, Mn${}_{2.94}$Ge (Ge-rich)