Abstract Magnetic spinel oxides, including CoFe2O4 (CFO), have crucial applications in spintronics. They have excellent magnetic properties, such as high spin polarization and high Curie temperature, which enables the operation of spintronic devices at room temperature. Some interesting phenomena have also been discovered for interfaces consisting of spinel oxides and heavy metals. However, the magnetic properties of ultrathin CFO films have not been investigated sufficiently. In this report, a characterization of the magnetic properties of an ultrathin CFO film was performed by using the magnetic proximity effect (MPE) to observe the anomalous Hall effect (AHE) in Pt. The result was consistent with the measurement performed with magneto-optical effects. By fitting AHE with the Langevin function, it was concluded that these ultrathin films (tCFO

中文翻译：

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利用磁邻近效应表征超薄 CoFe2O4 薄膜的磁性能

摘要 磁性尖晶石氧化物，包括 CoFe2O4 (CFO)，在自旋电子学中具有重要的应用。它们具有优异的磁性，例如高自旋极化和高居里温度，这使得自旋电子器件能够在室温下运行。对于由尖晶石氧化物和重金属组成的界面，也发现了一些有趣的现象。然而，超薄 CFO 薄膜的磁性尚未得到充分研究。在本报告中，通过使用磁邻近效应 (MPE) 观察 Pt 中的异常霍尔效应 (AHE)，对超薄 CFO 膜的磁性能进行了表征。结果与用磁光效应进行的测量一致。通过将 AHE 与 Langevin 函数拟合，得出的结论是这些超薄膜 (tCFO