研究目的
Investigating the growth optimization and magnetic properties of Cerium doped Yttrium Iron Garnet (YIG) thin films grown through Pulsed Laser Deposition technique.
研究成果
Ce doped YIG films exhibit higher magnetic saturation and smooth surface morphology. However, increased growth time leads to decreased magnetization due to CeO2 phase formation. The study confirms the absence of Pt magnetization in Pt/CeYIG/GGG structures, indicating pure spin Seebeck effect signals.
研究不足
The decrease in saturation magnetization with increased growth time due to the formation of residual CeO2 phase, indicating a limitation in achieving higher magnetic properties with thicker films.
1：Experimental Design and Method Selection:
The study employed Pulsed Laser Deposition (PLD) technique for growing YIG and cerium doped YIG thin films on gadolinium gallium garnet (GGG) substrates. The films were characterized for their structural, surface, and magnetic properties using XRD, AFM, and SQUID measurements.
2：Sample Selection and Data Sources:
High purity (
3：99%) cerium oxide (Ce2O), ytterbium oxide (Y2O3), and iron oxide (Fe2O3) were used as precursors. The powdered mixture was ball milled and sintered into pellets before deposition. List of Experimental Equipment and Materials:
PLD system, XRD (Rigaku rotating anode high brilliance diffractometer), AFM (Asylum 3d-PF Atomic Force Microscope), SQUID (Super Conducting Quantum Interference Device), and Peltier elements for temperature gradient.
4：Experimental Procedures and Operational Workflow:
Films were deposited at 900°C under oxygen pressure, with a KrF laser. Post-deposition, films were cooled to room temperature. A 10 nm Platinum (Pt) layer was sputtered on some films for Spin Seebeck effect measurements.
5：Data Analysis Methods:
XRD for phase purity and structure, AFM for surface morphology, SQUID for magnetic properties, and Spin Seebeck voltage measurements for magneto-thermal properties.
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X-ray diffractometer
RU-200BH, serial-L17171
Rigaku
Used for phase purity and structure analysis of the films.
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Atomic Force Microscope
Asylum 3d-PF
Oxford Instruments
Used for surface morphology study of the films.
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Pulsed Laser Deposition system
Used for growing YIG and cerium doped YIG thin films.
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Super Conducting Quantum Interference Device
SQUID
Used for magnetic properties measurement of the films.
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Peltier elements
Used to provide a stable temperature gradient for Spin Seebeck effect measurements.
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Helmholtz coil
Used to provide a varying magnetic field for Spin Seebeck effect measurements.
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nano voltmeter
Keithley 2182/A
Used to measure the Spin Seebeck voltage signal.
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