Two-dimensional (2D) magnetic supplies supply a promising platform for nanoscale spintronics and for exploration of novel bodily phenomena. Right here, we predict a various vary of magnetic orders in cobalt-based 2D single septuple layers CoX2Y4, specifically, CoBi2Te4, CoBi2Se2Te2, CoBi2Se4, and CoSb2Te4. Notably, CoBi2Te4 presents intrinsic non-collinear antiferromagnetism (AFM), whereas the others show collinear AFM. The emergence of AFM in all CoX2Y4 supplies is attributed to the antiferromagnetic 90° Co-Te(Se)-Co superexchange coupling. The origin of non-collinear/collinear orders lies in competing Heisenberg trade interactions throughout the Co triangular lattice. A pivotal issue governing the non-collinear order of CoBi2Te4 is the vanishingly small ratio of trade coupling between next-nearest neighbour Co and the closest neighbour Co (J2/J1 ~ 0.01). Moreover, our investigation into pressure results on CoX2Y4 lattices demonstrates the tunability of the magnetic state of CoSb2Te4 from collinear to non-collinear. Our prediction of the distinctive non-collinear AFM in 2D suggests the potential for observing extraordinary magnetic phenomena in 2D, together with non-collinear scattering and magnetic area partitions.
