Room temperature intrinsic anomalous Hall effect in disordered half-metallic ferromagnetic quaternary Heusler alloy CoRuFeSi

Manikantha Panda; Sonali S. Pradhan; Prabuddha Kant Mishra; Alapan Bera; Rosni Roy; Rajib Mondal; Soumik Mukhopadhyay; V. Kanchana; Tapas Paramanik

arXiv · 2601.12755

Room temperature intrinsic anomalous Hall effect in disordered half-metallic ferromagnetic quaternary Heusler alloy CoRuFeSi

Manikantha Panda·Sonali S. Pradhan·Prabuddha Kant Mishra·Alapan Bera·Rosni Roy·Rajib Mondal·Soumik Mukhopadhyay·V. Kanchana·Tapas Paramanik

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Abstract

Quaternary Heusler alloys offer a versatile platform for engineering magnetic and topological transport phenomena through chemical flexibility and tunable disorder. Here, we report a comprehensive experimental and theoretical investigation of the magnetic, magnetotransport, and anomalous Hall properties of the quaternary Heusler alloy CoRuFeSi. The compound crystallizes in the LiMgPdSn-type structure with significant Co--Ru antisite disorder and exhibits soft ferromagnetism with a saturation magnetization of $4.21~\mu_{\mathrm{B}}/\mathrm{f.u.}$ at low temperature and a Curie temperature well above room temperature. Hall measurements reveal a robust anomalous Hall effect persisting up to 300~K, with an anomalous Hall conductivity of $\sim 74$~S/cm that is nearly temperature independent. Scaling analysis demonstrates that the anomalous Hall response is dominated by the intrinsic Berry-curvature mechanism. First-principles calculations identify CoRuFeSi as a topologically nontrivial nodal-line semimetal in its ordered phase. Incorporation of experimentally relevant Co--Ru antisite disorder redistributes the Berry curvature and quantitatively reproduces the experimentally observed anomalous Hall conductivity, while preserving half-metallicity. These results establish CoRuFeSi as a disorder-tolerant half-metallic ferromagnet with a sizable intrinsic anomalous Hall effect at room temperature, highlighting its potential for spintronic and Hall-based device applications.

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Manikantha Panda, Sonali S. Pradhan, Prabuddha Kant Mishra, Alapan Bera, Rosni Roy, Rajib Mondal, Soumik Mukhopadhyay, V. Kanchana, Tapas Paramanik. 2026-01-19. Room temperature intrinsic anomalous Hall effect in disordered half-metallic ferromagnetic quaternary Heusler alloy CoRuFeSi. https://arxiv.org/abs/2601.12755

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