Hidden spin-texture at topological domain walls drive exchange bias in a Weyl semimetal

Abstract

Exchange bias is a phenomenon critical to solid-state technologies that require spin valves or non-volatile magnetic memory. The phenomenon is usually studied in the context of magnetic interfaces between antiferromagnets and ferromagnets, where the exchange field of the former acts as a means to pin the polarization of the latter. In the present study, we report an unusual instance of this phenomenon in the topological Weyl semimetal Co3Sn2S2, where the magnetic interfaces associated with domain walls suffice to bias the entire ferromagnetic bulk. Remarkably, our data suggests the presence of a hidden order parameter whose behavior can be independently tuned by applied magnetic fields. For micron-size samples, the domain walls are absent, and the exchange bias vanishes, suggesting the boundaries are a source of pinned uncompensated moment arising from the hidden order. The novelty of this mechanism suggests exciting opportunities lie ahead for the application of topological materials in spintronic technologies.

Main text: 11 pages, 4 figures. Supplementary information: 7 pages, 6 figures. Supplementary videos: 8

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• Anomalous depinning of magnetic domain walls within the ferromagnetic phase of the Weyl semimetal Co3Sn2S2
• Surface state evolution induced by magnetic order in axion insulator candidate EuIn2As2
• Intrinsic anomalous Hall effect arising from antiferromagnetic structure revealed by high-quality NbMnP
• Field Orientation Dependent Magnetic Phases In Weyl Semimetal Co3Sn2S2
• Magnetic memory and distinct spin populations in ferromagnetic Co3Sn2S2
• Tunable Anomalous Hall Effect in a Kagome Ferromagnetic Weyl Semimetal
• In-plane Antiferromagnetism in Ferromagnetic Kagome Semimetal Co3Sn2S2
• Measuring the Hall effect in hysteretic materials