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Magnetoelectric effect driven by magnetic domain modification in LuFe2O4.

Takashi Kambe1, Yukimasa Fukada1, Jun Kano1

  • 1Department of Physics, Faculty of Science, Okayama University, Okayama 700-8530, Japan.

Physical Review Letters
|August 29, 2014
PubMed
Summary

Researchers investigated the magnetocapacitance effect in LuFe(2)O(4) single crystals. Below 240 K, a magnetic field induced a dielectric hysteresis loop linked to ferromagnetic domain boundary motion.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • The magnetoelectric effect, where magnetic fields influence electric properties and vice versa, is crucial for novel electronic devices.
  • Luthetium iron oxide (LuFe2O4) is a multiferroic material exhibiting complex magnetic and dielectric behaviors.
  • Understanding the microscopic origins of magnetoelectric coupling in LuFe2O4 is essential for its technological applications.

Purpose of the Study:

  • To investigate the magnetocapacitance effect in single crystals of LuFe2O4.
  • To elucidate the relationship between magnetic field, dielectric properties, and domain structure.
  • To determine the microscopic origin of the magnetoelectric effect in this material.

Main Methods:

  • Impedance spectroscopy was employed to analyze the intrinsic and interfacial electrical responses.
  • Single crystals of LuFe2O4 were subjected to varying magnetic fields.
  • Neutron diffraction experiments were conducted under magnetic fields to probe structural changes.

Main Results:

  • A distinct hysteresis loop in the intrinsic impedance response was observed below approximately 240 K under an applied magnetic field.
  • The dielectric properties were found to be directly related to the motion of nanosized ferromagnetic domain boundaries.
  • Neutron diffraction confirmed the influence of magnetic fields on the domain structure.

Conclusions:

  • The observed magnetocapacitance effect in LuFe2O4 is attributed to the modification of its microscopic domain structure.
  • The motion of ferromagnetic domain boundaries plays a critical role in the magnetoelectric response.
  • These findings provide insights into the fundamental mechanisms governing magnetoelectricity in LuFe2O4.