Joonyoung Choi1,Mi Kyung Kim2,Wonshik Kyung3,4,Changyoung Kim3,4,Jin-Hong Park5,Jun-Won Rhim5,Se Young Park6,Younjung Jo1
Kyungpook National University1,Yonsei University2,Institute for Basic Science3,Seoul National University4,Ajou University5,Soongsil University6
Joonyoung Choi1,Mi Kyung Kim2,Wonshik Kyung3,4,Changyoung Kim3,4,Jin-Hong Park5,Jun-Won Rhim5,Se Young Park6,Younjung Jo1
Kyungpook National University1,Yonsei University2,Institute for Basic Science3,Seoul National University4,Ajou University5,Soongsil University6
The electrical tunability of material is the most important property for the application of new technologies. Modification of anomalous Hall conductivity (AHC) is an example that is required for spin-torque devices or advanced magnetic sensors. In that case, cobalt disulfide (CoS<sub>2</sub>) is a suitable material with the potential to increase its AHC a lot. CoS<sub>2</sub> is an itinerant ferromagnet and expected to be a magnetic topological material as it has turned out that there is small gapped Dirac-type dispersion at a little below the Fermi level as a Berry curvature (BC) source, originating AHC. The BC source is along the Γ-Μ direction in k-space and there are four of it in the first Brillouin zone possessing the same sign, resulting in a large contribution to AHC without canceling out each other. In this work, we measured the AHC of CoS<sub>2</sub>, controlling the amplitude of AHC by Fe- (hole) and Ni- (electron) doping, respectively. Purely intrinsic origin and the largest value of AHC have been observed in Co<sub>0.95</sub>Fe<sub>0.05</sub>S<sub>2</sub>. This result is well consistent with the AHC calculated by LDA+U methods in the energy scale.