研究目的
Investigating the magnetization reversal process in NiFe2O4 films grown by laser molecular beam epitaxy on SrTiO3(001) substrates.
研究成果
Nanosized NFO films fabricated on STO(001) substrates exhibit inverse spinel crystal structure and biaxial magnetic anisotropy. The study reveals the contribution of second order magneto-optical effects in magnetization reversal, confirmed by VSM measurements.
研究不足
The study is limited to annealed NFO/STO structures, and the effects of growth conditions on magnetic properties are not fully explored.
1：Experimental Design and Method Selection:
Epitaxial NFO films were grown by ablation of stoichiometric NiFe2O4 target in O2 using irradiation of KrF excimer laser. The growth temperature was in 500-800 C range. Samples were annealed at 1100 C during three hours in the air.
2：Sample Selection and Data Sources:
Commercially available STO(001) substrates were used.
3：List of Experimental Equipment and Materials:
Atomic force microscope (AFM) by NT-MDT, reflection high-energy electron diffraction (RHEED), X-ray diffraction, vibrating sample magnetometer (VSM), magneto-optic set-ups utilizing polar (PMOKE) and longitudinal (LMOKE) Kerr effects.
4：Experimental Procedures and Operational Workflow:
Surface morphology was analyzed by AFM. Crystal structure was studied by RHEED and XRD. Magnetization reversal was studied by VSM and magneto-optic set-ups.
5：Data Analysis Methods:
Spectral dependence of PMOKE was studied in 1-4 eV photon energy range. Magnetization curves were measured by VSM and PMOKE.
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