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Cobalt Ferrite Films: Nanopolishing and Magnetic Properties

机译：钴铁氧体薄膜：纳米抛光和磁性

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CoFe2O4 films were deposited on Si [(100) or (111)] substrates by pulsed laser deposition, varying substrate temperature and deposition time. All films showed highly (111)-preferred orientation. Magnetic measurements (hysteresis loops) at room temperature indicated that the films have in-plane magnetic anisotropy. By atomic force microscopy, the surface topology revealed an average roughness of approximately 15 nm due to the presence of droplets. To define the relevance of droplets on the films’ magnetic properties, we applied a nanopolishing technique after which the surfaces became notoriously smoother. As a consequence of this surface modification, we found that the hysteresis loops (measured again after nanopolishing) revealed changes in the magnetic response of the samples. The thinner films ( (t approx ~50) nm) revealed waist-type hysteresis loops with diminished values of the coercive field, while the thickest film ( (t approx ~100) nm) increased its coercive field without qualitative change in its loop shape. We attributed the altered magnetic response to different mechanisms that depend on sample thickness. For the thinner films, an additional anisotropy (to that existing in the plane) was induced after the nanopolishing procedure. For the thickest film, it was observed that differences are present after the elimination of the droplets, showing their important role in the magnetic response of the films.
机译：CoFe 2 O 4 薄膜通过脉冲激光沉积，变化的衬底温度和沉积时间在Si [（100）或（111）]衬底上沉积。所有膜均显示出高度（111）优先的取向。在室温下的磁测量（磁滞回线）表明该膜具有面内磁各向异性。通过原子力显微镜，由于液滴的存在，表面拓扑显示出约15nm的平均粗糙度。为了定义液滴与薄膜磁性能的相关性，我们应用了纳米抛光技术，此后表面变得异常光滑。这种表面修饰的结果是，我们发现磁滞回线（在纳米抛光后再次测量）揭示了样品磁响应的变化。较薄的薄膜（ （t约〜50） nm）显示出腰型磁滞回线，其值减小了。矫顽场，而最厚的薄膜（ （t约〜100） nm）增加了其矫顽场，而没有定性变化呈环形。我们将改变的磁响应归因于取决于样品厚度的不同机制。对于较薄的薄膜，在纳米抛光程序之后会引起额外的各向异性（相对于平面中存在的各向异性）。对于最厚的薄膜，观察到在消除液滴后存在差异，这表明它们在薄膜的磁响应中起重要作用。

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