Giant coercivity and enhanced intrinsic anomalous Hall effect at vanishing magnetization in a compensated kagome ferrimagnet

TL;DR

This study demonstrates that doping a kagome ferrimagnet with Cr induces near magnetic compensation, resulting in giant coercivity and enhanced anomalous Hall effect, advancing potential spintronic applications.

Contribution

It reveals that chemical doping in kagome ferrimagnets can tune magnetic compensation and significantly enhance the anomalous Hall effect, which was not previously demonstrated.

Findings

Giant coercive fields exceeding 14 T at near compensation.

Cr doping shifts the Fermi level, enhancing the anomalous Hall effect.

Chemical doping effectively tunes magnetic states in kagome materials.

Abstract

Ferrimagnets that can be driven to magnetic compensation show promise for use in spintronics as they exhibit a finite anomalous Hall effect at zero magnetic field without having a significant magnetic moment. Compensated ferrimagnet spintronic devices with both a large anomalous Hall effect and a high coercivity would be simultaneously easy to read and difficult to erase. The kagome ferrimagnet TbMn$_6$Sn$_6$ has been reported to host a large intrinsic anomalous Hall effect. Here, we demonstrate that doping the Mn sites with Cr drives the system towards magnetic compensation. For nearly compensated compositions at low temperatures, giant coercive fields exceeding 14 T are observed. Additionally, Cr doping significantly enhances the intrinsic anomalous Hall effect, which can be attributed to a shift in the Fermi level. Our results extend the range of unique magnetic states observed in kagome materials, demonstrating that chemical doping is an effective strategy to tune and realize these states.