Tunable Colossal Anomalous Hall Conductivity in Half‐Metallic Material Induced by d‐Wave‐Like Spin‐Orbit Gap

Author:

Choi Joonyoung1ORCID,Park Jin‐Hong2,Kyung Wonshik34,Kim Younsik34,Kim Mi Kyung5,Kwon Junyoung6,Kim Changyoung34,Rhim Jun‐Won27,Park Se Young89,Jo Younjung1ORCID

Affiliation:

1. Department of Physics Kyungpook National University Daegu 41566 South Korea

2. Research Center for Novel Epitaxial Quantum Architectures Department of Physics Seoul National University Seoul 08826 South Korea

3. Center for Correlated Electron Systems Institute for Basic Science Seoul 08826 South Korea

4. Department of Physics and Astronomy Seoul National University Seoul 08826 South Korea

5. Department of Physics Yonsei University Seoul 03722 South Korea

6. Department of Physics Pohang University of Science and Technology Pohang 37673 South Korea

7. Department of Physics Ajou University Suwon 16499 South Korea

8. Department of Physics and Origin of Matter and Evolution of Galaxies (OMEG) Institute Soongsil University Seoul 06978 South Korea

9. Integrative Institute of Basic Sciences Soongsil University Seoul 06978 South Korea

Abstract

AbstractThe anomalous Hall conductivity (AHC) in magnetic materials, resulting from inverted band topology, has emerged as a key adjustable function in spin‐torque devices and advanced magnetic sensors. Among systems with near‐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 the chemical potential through Fe‐ (hole) and Ni‐ (electron) doping. The primary mechanism underlying the colossal AHC is identified through the application of density functional theory and tight‐binding analyses. The main source of this substantial AHC is traced to four spin‐polarized massive Dirac dispersions in the kz = 0 plane of the Brillouin zone, located slightly below the Fermi level. In Co0.95Fe0.05S2, the AHC, which is directly proportional to the momentum‐space integral of the Berry curvature (BC), reached a record‐breaking value of 2507 Ω−1cm−1. This is because the BCs of the four Dirac dispersions all exhibit the same sign, a consequence of the d‐wave‐like spin‐orbit coupling among spin‐polarized eg orbitals.

Funder

National Research Foundation of Korea

National Science Foundation

Publisher

Wiley

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