Weak Ferromagnetism in the Helimagnet Ba2CuGe2O7

J. Chovana, M. Marderb and N. Papanicolaouc aDepartment of Physics, Matej Bel University, Tajovského 40, 974 01 Banská Bystrica, Slovakia bCenter for Nonlinear Dynamics and Department of Physics, The University of Texas at Austin, Austin, Texas cDepartment of Physics and Institute of Plasma Physics, University of Crete, Heraklion, Greece

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The Dzyaloshinskii-Moriya anisotropy, responsible for helimagnetism in Ba2CuGe2O7, has recently been shown to comprise also a weak-ferromagnetic component. We theoretically demonstrate the signatures of weak-ferromagnetism in the magnon spectrum when a magnetic field is applied perpendicular to the z axis. We also anticipate the occurrence of unconventional domain walls in the so-called intermediate phase, and briefly elucidate the importance of the weak ferromagnetic component of the Dzyaloshinskii-Moriya anisotropy for the dynamics of driven domain walls.

DOI: 10.12693/APhysPolA.126.32 PACS numbers: 75.30.Ds, 75.30.Gw, 75.30.Kz