Magnetotransport Study of van der Waals <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:msub><mml:mrow><mml:mi>Cr</mml:mi><mml:mi>PS</mml:mi></mml:mrow><mml:mn>4</mml:mn></mml:msub><mml:mo>/</mml:mo><mml:mo stretchy="false">(</mml:mo><mml:mi>Pt</mml:mi><mml:mo>,</mml:mo><mml:mi>Pd</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:math> Heterostructures: Spin-Flop Transition and Room-Temperature Anomalous Hall Effect
Rui Wu, Andrew Ross, Shilei Ding, Yuxuan Peng, Fangge He, Yi Ren, Romain Lebrun, Yong Wu, Zhen Wang, Jinbo Yang, Arne Brataas, Mathias Kläui
Abstract
We study magnetotransport in heterostructures composed of the van der Waals antiferromagnet ${\mathrm{Cr}\mathrm{PS}}_{4}$ and the heavy metals $\mathrm{Pt}$ and $\mathrm{Pd}$. In both types of devices, the transverse resistance (${R}_{xy}$) signal reveals the spin-flop transition of ${\mathrm{Cr}\mathrm{PS}}_{4}$ and a strong anomalous Hall effect at temperatures up to 300 K. While ${\mathrm{Cr}\mathrm{PS}}_{4}/\mathrm{Pt}$ devices allow for easy detection of the spin-flop transition, ${\mathrm{Cr}\mathrm{PS}}_{4}/\mathrm{Pd}$ devices show a more substantial enhancement in anomalous Hall effect at temperatures above 70 K 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 ${\mathrm{Cr}\mathrm{PS}}_{4}$.