研究目的
To demonstrate the magnetostrictive effect in micro-dotted FeCo film coated surface acoustic wave devices and suppress hysteresis by fully releasing internal coercivity.
研究成果
The micro-dotted pattern on FeCo thin-film effectively suppresses hysteresis, achieving a lower hysteresis error of 0.82% and higher magneto-sensitivity of 21.17 kHz mT?1 compared to continuous films. This confirms the theoretical model and demonstrates improved performance for SAW-based magnetic sensors.
研究不足
The study is limited to specific materials (FeCo, LiNbO3) and device configurations; hysteresis suppression may vary with different patterns or materials; experimental setup requires precise control of magnetic fields and may be sensitive to environmental factors.
1：Experimental Design and Method Selection:
The study uses coupling of modes (COM) theory and finite element method (FEM) analysis to simulate magneto-response in FeCo dots/128° YX LiNbO3 layered structures.
2：Sample Selection and Data Sources:
Samples include SAW devices with micro-dotted FeCo films and FeCo thin-films for comparison, fabricated on 128° YX LiNbO3 substrates.
3：List of Experimental Equipment and Materials:
Equipment includes RF magnetron sputtering system for deposition, vibrating sample magnetometer (Model AGM2900-04C) for hysteresis measurement, Helmholtz coil system for magnetic field generation, FPGA-based frequency acquisition module, and software like COMSOL Multiphysics for FEM analysis. Materials include FeCo alloy, Al electrodes, Cr adhesive layer, SiO2 protective layer, and LiNbO3 substrate.
4：Experimental Procedures and Operational Workflow:
Fabricate SAW devices with SPUDTs and FeCo dots/patterns; measure hysteresis loops; integrate devices into differential oscillation loops; characterize responses under magnetic fields using Helmholtz coils and frequency acquisition.
5：Data Analysis Methods:
Analyze frequency shifts and hysteresis errors using COM theory and FEM-extracted parameters; compare theoretical and experimental results.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
