嵌入钴纳米颗粒磁各向异性中的尺寸效应：从形状到表面

Oyarzún Simón, Tamion Alexandre, Tournus Florent, Dupuis Véronique, Hillenkamp Matthias

Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France.

Sci Rep. 2015 Oct 6;5:14749. doi: 10.1038/srep14749.

Strong size-dependent variations of the magnetic anisotropy of embedded cobalt clusters are evidenced quantitatively by combining magnetic experiments and advanced data treatment. The obtained values are discussed in the frame of two theoretical models that demonstrate the decisive role of the shape in larger nanoparticles and the predominant role of the surface anisotropy in clusters below 3 nm diameter.

通过结合磁性实验和先进的数据处理方法，定量地证明了嵌入钴团簇的磁各向异性存在强烈的尺寸依赖性变化。在两个理论模型的框架内讨论了所得值，这两个模型表明形状在较大纳米颗粒中起决定性作用，而表面各向异性在直径小于3纳米的团簇中起主要作用。