Modification of unconventional Hall effect with doping at the non-magnetic site in a 2D van der Waals ferromagnet

TL;DR

This study demonstrates that doping at the non-magnetic site in a 2D van der Waals ferromagnet can modify the unconventional Hall effect, revealing new ways to control spin textures and magnetotransport properties without altering magnetic atoms.

Contribution

It introduces a novel doping strategy at non-magnetic sites to manipulate magnetotransport and spin textures in 2D vdW ferromagnets, expanding the methods for spintronic device engineering.

Findings

Unconventional Hall effect is significantly modified by As doping.

Doping at non-magnetic sites influences underlying spin configurations.

Emergent electromagnetic behavior linked to complex spin textures.

Abstract

Two-dimensional (2D) van der Waals (vdW) magnetic materials have garnered considerable attention owing to the existence of magnetic order down to atomic dimensions and flexibility towards interface engineering, offering an attractive platform to explore novel spintronic phenomena and functionalities. Understanding of the magnetoresistive properties and their correlation to the underlying magnetic configurations is essential for 2D vdW-based spintronic or quantum information devices. Among the promising candidates, vdW ferromagnet (FM) Fe3GeTe2 shows an unusual magnetotransport behavior, tunable by doping at the magnetic (Fe) site, and tentatively arising from complicated underlying spin texture configurations. Here, we explore an alternative route towards manipulation of magnetotransport properties of a vdW FM without directly affecting the magnetic site i.e., by doping at the non-magnetic (Ge) site of Fe3(Ge,As)Te2. Interestingly, doping at the non-magnetic (Ge) site results in an unconventional Hall effect whose strength was considerably modified by increasing As concentration, possibly arising from emergent electromagnetic behavior from underlying complicated spin configurations. The present results provide a possible route to understand the intricate role played by the non-magnetic (Ge) atom towards magnetic properties of vdW FMs, and shows a novel direction towards tailoring of underlying interactions responsible for the stabilization of non trivial spin textures in 2D magnetic vdW materials.