研究目的
To investigate the influence of phase structure on the acoustic and optical modes of ferromagnetic resonance in FeNi stripe domain films, with a focus on how different phases (bcc, fcc, and mixed bcc+fcc) affect the resonance frequencies and properties, aiming to aid in the development of microwave devices.
研究成果
FeNi films with bcc and mixed bcc+fcc phase structures exhibit small grain sizes, good magnetic properties, and clear stripe domain patterns, leading to distinct acoustic and optical mode resonances with higher frequencies for optical modes. These properties are beneficial for developing tunable microwave devices, with optimal performance observed for Ni atomic percentages between 25% and 38%.
研究不足
The study is limited to FeNi films prepared by electrodeposition, which may not generalize to other fabrication methods. The optic mode has low permeability and weak precession, making it challenging to observe and measure accurately. The influence of film thickness was excluded in some analyses, potentially overlooking thickness-dependent effects. The phase structures are controlled by composition, but non-linear deposition rates complicate precise control.
1：Experimental Design and Method Selection:
Fe1-xNix films were prepared by electrodeposition on ITO substrates to control phase structure through composition variation. The study focused on characterizing crystal structures, magnetic properties, and permeability spectra to analyze acoustic and optical modes of ferromagnetic resonance.
2：Sample Selection and Data Sources:
Films with compositions x=0, 0.02, 0.04, 0.05, 0.06, 0.08, and 0.1 (corresponding to Fe, Fe88Ni12, Fe75Ni25, Fe70Ni30, Fe62Ni38, Fe43Ni57, and Ni) were prepared. Data were collected from XRD, EDS, surface profilometry, MFM, VSM, and VNA measurements.
3：02, 04, 05, 06, 08, and 1 (corresponding to Fe, Fe88Ni12, Fe75Ni25, Fe70Ni30, Fe62Ni38, Fe43Ni57, and Ni) were prepared. Data were collected from XRD, EDS, surface profilometry, MFM, VSM, and VNA measurements.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included X-ray diffractometer (PANalytical X'Pert), energy-dispersive spectrometer, surface profile-meter (VEECO Dektak-8), magnetic force microscopy (Asylum Research MFP3D), vibrating sample magnetometer (Lakeshore 7304), and vector network analyzer (Agilent E8363B). Materials included H3BO3, C6H8O6, C2H5NO2, C7H5O3NS, FeSO4·7H2O, NiSO4·7H2O, and ITO substrates.
4：Experimental Procedures and Operational Workflow:
Films were electrodeposited with controlled electrolyte compositions. XRD was used for phase identification, EDS for composition analysis, profilometry for thickness measurement, MFM for domain imaging, VSM for static magnetic properties, and VNA for permeability spectra from 100 MHz to 9 GHz under specific field orientations to excite acoustic and optical modes.
5：Data Analysis Methods:
Data were analyzed using Scherrer formula for grain size estimation, interpretation of hysteresis loops for magnetic properties, and analysis of permeability spectra to determine resonance frequencies and modes.
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