• Sa Debanand

      Articles written in Pramana – Journal of Physics

    • A phenomenological theory for polarization flop in spiral multiferroic TbMnO$_3$

      Tiwari Shruti Sa Debanand

      More Details Abstract Fulltext PDF

      A phenomenological Landau theory has been used to explain magnetic field-driven polarization flop in TbMnO3. The Néel wall-like magnetic structure in spiral multiferroics induces a space-dependent internal magnetic field which exerts a torque on spins to rotate bc-spiral to abspiral. The external magnetic field is argued to be competing with easy axis anisotropy and the system stabilizes when anisotropy is minimum.With the help of Landau free energy with DM magnetoelectric coupling and a general ansatz for magnetization, the phenomenon of polarization flop has been explained. Relation between Tflop and critical magnetic field has been established and found to be in good agreement with the experiment. This could be an indication that anisotropy ofthe system is temperature- and magnetic field-dependent.

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