Planar Hall effect caused by the memory of antiferromagnetic domain walls in Mn${}_3$Ge

Abstract

In Mn${}_3$X (X=Sn, Ge) antiferromagnets domain walls are thick and remarkably complex because of the non-collinear arrangement of spins in each domain. A planar Hall effect (PHE), an electric field perpendicular to the applied current but parallel to the applied magnetic field, was recently observed inside the hysteresis loop of Mn${}_3$Sn. The sign of the PHE displayed a memory tuned by the prior orientation of the magnetic field and its history. We present a study of PHE in Mn${}_3$Ge extended from room temperature down to 2 K and show that this memory effect can be manipulated by either magnetic field or thermal cycling. We show that the memory can be wiped out if the prior magnetic field exceeds 0.8 T or when the temperature exceeds $T_{\mathrm{N}}$. We also find a detectable difference between the amplitude of PHE with zero-field and field thermal cycling. The ratio between the PHE and the anomalous Hall effect (AHE) decreases slightly as temperature is increased from 2 K to $T_{\mathrm{N}}$, tracks the temperature dependence of magnetization. This erasable memory effect may be used for data storage.

5 pages, 4 figures

References in corpus (5)

• Discovery of a quantum limit Chern magnet TbMn6Sn6
• Non-collinear Antiferromagnets and the Anomalous Hall Effect
• Cluster multipole theory for anomalous Hall effect in antiferromagnets
• Chiral domain walls of Mn${}_3$Sn and their memory
• Anomalous thermal Hall effect in the topological antiferromagnetic state

Cited by in corpus (6)

• Field-linear anomalous Hall effect and Berry curvature induced by spin chirality in the kagome antiferromagnet Mn3Sn
• Large Anomalous Hall Effect at Room Temperature in a Fermi-Level-Tuned Kagome Antiferromagnet
• Intrinsic Magnetic Topological Materials
• Unconventional magneto-resistance, and electronic transition in Mn${}_3$Ge Weyl semimetal
• Electronic band structures of topological kagome materials
• Magnetic memory and distinct spin populations in ferromagnetic Co3Sn2S2