Magnetoelectric properties of bulk 0-3 Fe/BaTiO3-composites
Toni Buttlar1,2, Hartmut S Leipner2, Stefan G Ebbinghaus1
1Institute of Chemistry, Martin Luther University Halle-Wittenberg Kurt-Mothes-Strasse 2 06120 Halle Germany stefan.ebbinghaus@chemie.uni-halle.de +49-345-5527028 +49-345-5525871.
RSC Advances
|September 17, 2025
Summary
Magnetoelectric composites of iron and barium titanate were synthesized. Researchers observed distinct magnetoelectric effects based on iron doping and field orientation, revealing insights into material properties.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Magnetoelectric composites offer tunable properties by combining ferroelectric and ferromagnetic phases.
- Barium titanate (BaTiO3) is a well-known ferroelectric material with potential for magnetoelectric applications.
- Iron (Fe) is a common ferromagnetic material that can be integrated into composite structures.
Purpose of the Study:
- To synthesize and characterize 0-3 magnetoelectric Fe/(BaTiO3) composites.
- To investigate the influence of iron doping in the BaTiO3 matrix on magnetoelectric properties.
- To correlate magnetoelectric coefficients with material properties like magnetostriction and phase transitions.
Main Methods:
- Synthesis of Fe/(BaTiO3) composites via reduction of Fe2O3/BaTiO3 pellets.
- Sintering of composite ceramics using carbon or zirconium carbide as oxygen getters.
- Rietveld refinements and magnetic measurements for composition analysis.
- Field-dependent and temperature-dependent magnetoelectric measurements.
Main Results:
- Dense composite ceramics with micrometer-sized Fe particles embedded in a BaTiO3 matrix were successfully formed.
- Experimentally determined iron content matched nominal values in undoped composites.
- Magnetoelectric measurements showed differences between doped and undoped BaTiO3, particularly with perpendicular field orientation.
- Largest magnetoelectric coefficients (αME) were observed for specific Fe compositions (x=0.4 parallel, x=0.3 perpendicular).
- Low-temperature phase transitions of BaTiO3 were detected through temperature-dependent magnetoelectric studies.
Conclusions:
- The synthesis route yields well-defined Fe/BaTiO3 magnetoelectric composites.
- Iron doping in the BaTiO3 matrix influences magnetoelectric coupling, especially under perpendicular field conditions.
- The study derived magnetostriction of iron and a phenomenological model for magnetoelectric effects.
- The composites exhibit potential for applications requiring tunable magnetoelectric responses and phase transition detection.
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