Presentation Information
[17a-M_178-2]Magnetocapacitance effects in van der Waals antiferromagnetic material
〇Ikoi Sato1,2, Miuko Tanaka2, Tomohiro Ishii1,2, Itishree Pradhan2, Takashi Taniguchi3, Kenji Watanabe3, Masayuki Hashisaka2, Toshiya Ideue2 (1.UTokyo, 2.ISSP, 3.NIMS)
Keywords:
van der Waals material,antiferromagnetic material
Van der Waals magnets have attracted significant attention in recent years due to their unique symmetries and magnetic structures—absent in bulk crystals—which enable the emergence and control of novel physical properties. While extensive research has been reported on optical responses such as the tunneling magnetoresistance effect, photoluminescence, and second-harmonic generation, the dielectric response in van der Waals magnetic insulators remains poorly understood.In this study, we focused on capacitance, a fundamental physical quantity characterizing the electric-field response of van der Waals insulators. We fabricated parallel-plate capacitor structures using nanoflakes of van der Waals antiferromagnetic material. By applying an AC voltage and measuring the capacitance, we observed capacitance changes originating from the magnetic transition. Furthermore, based on the observed behavior, we provide a detailed discussion on the microscopic origin of the capacitance.These results represent the first observation of the magnetocapacitance effect in nanoflakes of van der Waals magnets. Our findings suggest that capacitance measurement can serve as a powerful new methodology for evaluating and understanding van der Waals magnets, while simultaneously providing an impetus for exploring novel dielectric responses unique to these systems.