On the anomalous low-resistance state and exceptional Hall component in hard-magnetic Weyl nanoflakes

TL;DR

This paper reports on unique low-resistance and enhanced Hall effects in magnetic Weyl nanoflakes, revealing new transport phenomena linked to magnetic textures and Weyl fermions, with implications for spintronics.

Contribution

It uncovers novel anomalous transport behaviors in magnetic Weyl nanoflakes, highlighting the role of nonlinear magnetic textures and chiral magnetic fields.

Findings

Low-resistance state when magnetization opposes the magnetic field

Exceptional Hall component up to three times larger than conventional values

Insights into nonlinear magnetic textures and Weyl fermion effects

Abstract

Magnetic topological materials, which combine magnetism and topology, are expected to host emerging topological states and exotic quantum phenomena. In this study, with the aid of greatly enhanced coercive fields in high-quality nanoflakes of the magnetic Weyl semimetal Co3Sn2S2, we investigate anomalous electronic transport properties that are difficult to reveal in bulk Co3Sn2S2 or other magnetic materials. When the magnetization is antiparallel to the applied magnetic field, the low longitudinal resistance state occurs, which is in sharp contrast to the high resistance state for the parallel case. Meanwhile, an exceptional Hall component that can be up to three times larger than conventional anomalous Hall resistivity is also observed for transverse transport. These anomalous transport behaviors can be further understood by considering nonlinear magnetic textures and the chiral magnetic field associated with Weyl fermions, extending the longitudinal and transverse transport physics and providing novel degrees of freedom in the spintronic applications of emerging topological magnets.