研究目的
Investigating the dielectric, piezoelectric and magnetic behavior of CoFe2O4/BNT-BT0.08 composite thin film fabricated by sol-gel and spin-coating methods for applications in miniature low-frequency magnetic sensors and piezoelectric sensors.
研究成果
The CoFe2O4/BNT-BT0.08 bilayer composite exhibits promising ferromagnetic, ferroelectric, and piezoelectric properties, making it suitable for high-performance magnetoelectric devices at room temperature. The study highlights the potential of this composite for applications in sensors and other electronic devices.
研究不足
The study acknowledges the influence of the substrate and the thickness ratio between the magnetic and piezoelectric phases on the composite's properties, suggesting areas for further optimization.
1：Experimental Design and Method Selection
The study involved the fabrication of a bilayer composite thin film using sol-gel and spin-coating techniques. The composite was characterized using X-ray diffraction, dielectric spectroscopy, piezoelectric force microscopy, SQUID magnetometry, atomic force microscopy/magnetic force microscopy, and advanced methods of transmission electron microscopy.
2：Sample Selection and Data Sources
The samples were prepared on Si-Pt substrates, with CoFe2O4 and BNT-BT0.08 layers deposited sequentially. The precursor sols were prepared using specific chemical compounds.
3：List of Experimental Equipment and Materials
Bruker-AXS tip D8 ADVANCE diffractometer, FEI QUANTA INSPECT F scanning electron microscope, TecnaiTM G2 F30 S-TWIN transmission electron microscope, Quantum Design MPMS-5S SQUID magnetometer, Agilent Technology Model 5400 AFM/MFM, HP 4194 A impedance bridge, Radiant Technologies RT-66A system.
4：Experimental Procedures and Operational Workflow
The films were deposited by spin casting, heated to evaporate the solvent and eliminate organic components, and then annealed to crystallize the layers. The structure and properties of the heterostructure were then characterized using the aforementioned techniques.
5：Data Analysis Methods
Data analysis involved interpreting XRD patterns, SEM and TEM images, magnetic hysteresis loops, dielectric properties, and piezoelectric responses to understand the composite's behavior.
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Bruker-AXS tip D8 ADVANCE diffractometer
D8 ADVANCE
Bruker
Structural characterization of the heterostructure thin film
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FEI QUANTA INSPECT F scanning electron microscope
QUANTA INSPECT F
FEI
Microstructure investigation
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Quantum Design MPMS-5S SQUID magnetometer
MPMS-5S
Quantum Design
Magnetic hysteresis loops recording
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Agilent Technology Model 5400 AFM/MFM
5400
Agilent Technology
Out-of-plane magnetic characteristics observation
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Radiant Technologies RT-66A system
RT-66A
Radiant Technologies
Leakage currents measurements
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TecnaiTM G2 F30 S-TWIN transmission electron microscope
G2 F30 S-TWIN
Tecnai
High resolution transmission electron microscopy
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HP 4194 A impedance bridge
4194 A
HP
Capacitance and dielectric loss measurements
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