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Multipiezo effect in altermagnet V2SeO monolayer at high temperature

Abid ZamanDepartment of Physics, Riphah International University Islamabad 44000, PakistanKakul HusainDepartment of Chemistry, College of Science and Humanities in Al-Kharj, Prince Sattam Bin Abdulaziz University, 11942 Al-Kharj, Saudi ArabiaSalhah Hamed AlrefaeeDepartment of Chemistry, College of Science, Taibah University, Madinah Saudi ArabiaHifsa ShahidDepartment of Electrical Engineering, College of Engineering, Qassim University, Unayzah, Saudi ArabiaMuawya ElhadiDepartment of physics, Faculty of Science and Humanities, Ad- Dawadimi 11911Anvar NurmuhammedovWestern Caspian University, Baku, AZ-1001, AzerbaijanRawaa M. MohammedDeparment of Physics, College of Nursing, Al-Mustaqbal University, IraqVineet TirthCentre for Engineering and Technology Innovations, King Khalid University, Abha 61421, Aseer, Kingdom of Saudi ArabiaAli AlgahtaniMechanical Engineering Department, College of Engineering, King Khalid University, Abha 61421, Aseer, Kingdom of Saudi ArabiaNoureddine ElboughdiriChemical Engineering Department, College of Engineering, University of Ha’il, P.O. Box 2440, Ha'il 81441, Saudi Arabia

2025en

ABI

Annotatsiya

Altermagnetism, characterized by a compensated magnetic order with momentum-dependent spin splitting, has recently gained attention as a potential platform for advanced spintronic technologies. When combined with multifunctional responses such as piezoelectricity, piezovalley, and piezomagnetism, exciting possibilities for strain-controlled magneto-electronic applications are opened. In this study, we investigated the Janus monolayer V 2 SeO, a two-dimensional altermagnetic material, using first-principles calculations. A high Néel temperature of 950 K confirmed the antiferromagnetic nature of the ground state. The material is thermodynamically and dynamically stable. Furthermore, V 2 SeO exhibits a direct band gap of 0.34 eV and non-relativistic spin-splitting (∼0.26 eV) at high-symmetry points, confirming its altermagnetic character. The broken mirror symmetry of the Janus structure enabled an out-of-plane piezoelectric effect, with calculated coefficients of e 31 = 49.90 pC/m and d31 = 0.25 pm/V. A strain-induced piezovalley effect yields a large valley polarization of up to 131 meV, while doping under strain induces a finite piezomagnetic response. These coexisting properties, including altermagnetism, piezoelectricity, piezovalley, and piezomagnetism, position monolayer V 2 SeO as a strong candidate for future strain-tunable spintronic and valleytronic devices applications. Its potential synthesis via exfoliation or chemical vapor deposition makes it experimentally accessible.

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DOI: 10.1016/j.csite.2025.106943

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