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Dynamics of multiferroic domain wall in spin-cycloidal ferroelectric DyMnO3
F Kagawa1, M Mochizuki, Y Onose
1Multiferroics Project, ERATO, Japan Science and Technology Agency (JST), c/o Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
Physical Review Letters
|March 5, 2009
Summary
Giant magnetocapacitance in multiferroic DyMnO3 arises from mobile domain walls, not electromagnons. These domain walls exhibit rapid motion even at low temperatures, suggesting a thick magnetic origin.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Multiferroics
Background:
- Giant magnetocapacitance (GMC) is a significant phenomenon in multiferroic materials.
- Understanding the origin of GMC is crucial for developing novel electronic devices.
- DyMnO3 is a multiferroic material exhibiting complex magnetic and electric properties.
Purpose of the Study:
- To investigate the origin of giant magnetocapacitance (GMC) in multiferroic DyMnO3.
- To analyze the dielectric dispersion of GMC over a wide frequency range.
- To elucidate the role of domain wall motion in GMC.
Main Methods:
- Dielectric spectroscopy measurements over a wide frequency range.
- Analysis of dielectric dispersion data.
- Model simulations of domain wall behavior.
Main Results:
- Giant magnetocapacitance (GMC) in DyMnO3 is attributed to electric-field-driven domain wall (DW) motion, not softened electromagnons.
- Multiferroic DWs exhibit a high relaxation rate (~10^7 s^-1) even at low temperatures.
- Model simulations suggest that the multiferroic DWs are thick, indicating a magnetic origin.
Conclusions:
- The electric-field-driven motion of multiferroic domain walls is the primary source of GMC in DyMnO3.
- The high mobility and thickness of these domain walls distinguish them from conventional ferroelectric domain walls.
- These findings offer insights into the fundamental mechanisms governing magnetocapacitance in multiferroics.
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