Electrical detection of the spin-flop and room-temperature magnetic ordering in van der Waals CrPS$_{4}$/(Pt, Pd) heterostructures

Abstract: We study magneto-transport in heterostructures composed of the van der Waals antiferromagnet CrPS${4}$ and the heavy metals Pt and Pd. The transverse resistance (R${xy}$) signal reveals the spin-flop transition of CrPS${4}$ and a strongly enhanced magnetic ordering temperature (>300 K), which might originate from a strong spin-orbit coupling at the interface. While CrPS${4}$/Pt devices allow for easy detection of the spin-flop transition, CrPS${4}$/Pd devices show a more substantial enhancement in magnetic ordering temperature and exhibit a topological Hall effect signal, possibly related to chiral spin structures at the interface. The longitudinal magnetoresistance (R${xx}$) results from a combination of spin-Hall magnetoresistance and the negative magnetoresistance that can be explained by a field-induced change of the electronic band structure of CrPS$_{4}$.