Magnetic-field induced spiral order in the electric polarization
arxiv(2024)
摘要
We present a phenomenological model for magnetoelectricity in multiferroic
materials. The distinctive feature of the model is a two-component complex
order parameter that encodes the electric polarization, along with a direct
coupling between the polarization and magnetic field. Our model effectively
elucidates that a sufficiently strong magnetic field can destroy electric
polarization. Furthermore, the transition field strength diminishes with rising
temperature, following a power-law relation with the exponent being precisely
worked out. At lower field strength, the electric polarization takes a spiral
order in the magnetic field, with the spiral wavelength inversely proportional
to the magnetic field strength. We anticipate these predictions can be
experimentally tested in future studies on multiferroic materials.
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