A new quantum hydrodynamic description of ferroelectricity in spiral magnets

Trukhanova, M.I.; Andreev, P.; Obukhov, Y.N.

Авторы: Trukhanova Mariya Iv, Andreev Pavel, Obukhov Yuri N.
Журнал: International Journal of Modern Physics B
Год издания: 2024
Издательство: World Scientific Publishing Co
Местоположение издательства: Singapore
Первая страница: 2550072
DOI: 10.1142/S0217979225500729
Аннотация: The strong coupling between magnetism and ferroelectricity was found in rare-earth manga-nites, where the electric polarization could be induced by special magnetic ordering. There isno theoretical model that would allow us to study the static and dynamic properties ofelectric polarization in strongly correlated magnetic dielectrics. In the presented research, wehave taken the main step toward the construction of such a fundamental model and made adirect connection between the microscopic Katsura–Nagaosa–Balatsky theory and Mostovoy'sphenomenological model for magnetically induced polarization. A novel description of the fer-roelectricity of spin origin is proposed within the framework of the many-particle quantumhydrodynamics method. It is applied to the study of cells of magnetic ions, where the electricdipole moment is proportional to the vector product of spins. Our approach is based on themany-particle Pauli equation, where the in°uence of an external magnetic ¯eld is considered.We de¯ne the electric dipole moment operator of the ion cell and introduce the macroscopicpolarization as the quantum mechanical average of that operator. We formulate a model for thedescription of nonequilibrium polarization and derive a new polarization evolution equation.The polarization switching in ferroelectric magnets with the spiral spin-density-wave state isconsidered, and we demonstrate that the proposed model yields known results and can predictnovel e®ects. The dynamic magnetoelectric e®ect can be investigated by employing this novelequation to study the evolution of polarization.
Добавил в систему: Труханова Мария Ивановна

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