Spin-Valve-Like Magnetoresistance and Anomalous Hall Effect in Magnetic Weyl Metal Mn$_2$PdSn

TL;DR

This study demonstrates room-temperature spin-valve-like magnetoresistance and significant anomalous Hall effect in a magnetic Weyl metal, Mn$_2$PdSn, revealing its potential for novel electronic applications due to its topologically non-trivial band structure.

Contribution

It reports the first observation of spin-valve-like magnetoresistance and anomalous Hall effect in a magnetic Weyl metal with an inverse Heusler structure, supported by ab initio calculations.

Findings

Room-temperature spin-valve-like magnetoresistance observed.

Topologically non-trivial band structure with Weyl nodes confirmed.

Large anomalous Hall conductivity linked to Berry curvature.

Abstract

Realization of noncentrosymmetric magnetic Weyl metals is expected to exhibit anomalous transport properties stemming from the interplay of unusual bulk electronic topology and magnetism. Here, we present spin-valve-like magnetoresistance at room temperature in ferrimagneticWeyl metal Mn$_2$PdSn that crystallizes in the inverse Heusler structure. Anomalous magnetoresistance display dominant asymmetric component attributed to domain wall electron scattering, indicative of spin-valve-like behavior. Ab initio calculations confirm the topologically non-trivial nature of the band structure, with three pairs of Weyl nodes proximate to the Fermi level, providing deeper insights into the observed intrinsic Berry curvature mediated substantial anomalous Hall conductivity. Our results underscore the inverse Heusler compounds as promising platform to realize magnetic Weyl metals/semimetals and leverage emergent transport properties for electronic functionalities.