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  • [논문] 양자나노물성: Tunable Colossal Anomalous Hall Conductivity inHalf-Metallic Material Induced by d-Wave-Like Spin-OrbitGap

    • 등록일
      2024.12.31
    • 조회수
      26

•연구자: 물리학과 박세영

 

•발표일: 2024.05

 

•DOI:  https://doi.org/10.1002/advs.202307288

 

•Joonyoung Choi et al., Advanced Science (Q1), Volume 11, Issue 20 (2024)

 

•Abstract

The anomalous Hall conductivity (AHC) in magnetic materials, resulting frominverted band topology, has emerged as a key adjustable function inspin-torque devices and advanced magnetic sensors. Among systems withnear-half-metallicity and broken time-reversal symmetry, cobalt disulfide(CoS2 ) has proven to be a material capable of significantly enhancing its AHC.In this study, the AHC of CoS2 is empirically assessed by manipulating thechemical potential through Fe- (hole) and Ni- (electron) doping. The primarymechanism underlying the colossal AHC is identified through the applicationof density functional theory and tight-binding analyses. The main source ofthis substantial AHC is traced to four spin-polarized massive Diracdispersions in the kz = 0 plane of the Brillouin zone, located slightly below theFermi level. In Co0.95 Fe0.05 S2 , the AHC, which is directly proportional to themomentum-space integral of the Berry curvature (BC), reached arecord-breaking value of 2507 𝛀 −1 cm−1 . This is because the BCs of the fourDirac dispersions all exhibit the same sign, a consequence of the d-wave-likespin-orbit coupling among spin-polarized eg orbitals.

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