Unconventional Emergent Hall Effect Phenomena and its Modification in a van der Waals Ferromagnet Fe3GeTe2

The discovery of two-dimensional (2D) magnetic van der Waals (vdW) materials and the stabilization of magnetic order down to the monolayer limit have ushered in a new venture, important from a fundamental viewpoint leading to development of novel spintronics devices. 2D vdW ferromagnet (FM) Fe3GeTe2 (FGT) is an interesting candidate owing to high Curie temperature, uniaxial magnetic anisotropy, and realization of an unconventional chiral magnetic ground state. Here, we investigate an unexplored route towards manipulation of the exotic ground state of FGT via chemical doping at the magnetic (Fe) and non-magnetic (Ge) site of (Fe,Co)3(Ge,As)Te2. Interestingly, Cobalt (Co) and Arsenic (As) doping results in an unconventional Hall effect whose strength can be considerably modified by increasing concentration, arising from emergent electromagnetic behaviour from underlying complicated spin configurations.