Magnetic, dielectric, and magneto-dielectric properties of rare-earth-substituted Aurivillius phase Bi₆Fe₁.₄Co₀.₆Ti₃O₁₈
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (China)
We investigate the magnetic, dielectric, and magnetodielectric properties of rare-earth-substituted Aurivillius phase Bi₆Fe₁.₄Co₀.₆Ti₃O₁₈. The room-temperature ferromagnetic behavior is observed in all samples, and the rare-earth-substituted samples exhibit an enhanced magnetization. The weak ferromagnetism can be ascribed to the spin canting of the antiferromagnetic coupling of the Fe-based and Co-based sublattices via Dzyaloshinsky-Moriya interaction. The dielectric loss of all samples exhibits two dielectric relaxation peaks corresponding to two different relaxation mechanisms. One relaxation process with E{sub a}=0.5 eV is related to the hoping process of oxygen vacancies and the other one with E{sub a}=1.6 eV can be ascribed to the intrinsic conduction. The Gd-doped sample exhibits a remarkable magnetodielectric effect (9.4%) at RT implying this Aurivillius phase may be the potential candidate for magnetodielectric applications.
- OSTI ID:
- 22305833
- Journal Information:
- Journal of Applied Physics, Vol. 116, Issue 15; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
BISMUTH COMPOUNDS
COBALT COMPOUNDS
COUPLING
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
DOPED MATERIALS
FERROMAGNETISM
INTERACTIONS
IRON COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIZATION
OXYGEN
OXYGEN COMPOUNDS
RARE EARTH ADDITIONS
RELAXATION
SPIN
TEMPERATURE RANGE 0273-0400 K
TITANIUM COMPOUNDS
VACANCIES