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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
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Combined Arrhenius-Merz Law Describing Domain Relaxation in Type-II Multiferroics.

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Electric fields control chiral domains in multiferroic TbMnO3 crystals. Domain relaxation is primarily governed by domain wall motion, described by a simple activation and Merz law model.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Multiferroic materials exhibit coupled ferroelectric and magnetic orders.
  • Controlling chiral magnetic domains with electric fields is crucial for device applications.
  • TbMnO3 is a model multiferroic system exhibiting complex magnetic ordering.

Purpose of the Study:

  • To investigate the electric-field-induced control of chiral domain relaxation in TbMnO3 single crystals.
  • To determine the underlying mechanisms governing domain dynamics over an extended timescale.
  • To develop a predictive model for domain relaxation behavior.

Main Methods:

  • Application of electric fields to TbMnO3 single crystals.
  • Study of domain relaxation over 8 decades using polarized neutron scattering.
  • Analysis of relaxation times using activation and Merz law models.

Main Results:

  • A simple combination of activation and Merz laws accurately describes relaxation times across wide electric field and temperature ranges.
  • Domain wall motion is identified as the dominant process for multiferroic domain inversion over most conditions.
  • Accelerated domain inversion occurs near the multiferroic transition due to additional mechanisms.

Conclusions:

  • The dynamics of chiral domain relaxation in TbMnO3 are predominantly governed by domain wall motion.
  • A two-parameter model effectively captures the relaxation behavior, simplifying the understanding of multiferroic dynamics.
  • Understanding these dynamics is key for harnessing multiferroics in advanced electronic devices.