Ferromagnetic nanocylinders electrodeposited into nanoporous alumina template: A magnetometry and Brillouin light scattering study
Ferromagnetic nanocylinders electrodeposited into nanoporous alumina template: A magnetometry and Brillouin light scattering study
复制标题
铁磁纳米圆柱电沉积到纳米多孔氧化铝模板中：磁力测定和布里渊光散射研究
DOI：
--
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
L. Piraux
中科院分区：
文献类型：
--
作者：
S. Chérif;Y. Roussigné;A. Stashkevich;M. Darques;K. Bouziane;L. Piraux
用振动样品磁强计测定了钴（Co）、坡莫合金（Py）和镍（Ni）纳米圆柱体的静态磁化实验行为，用布里渊散射光谱分析了Co和Py纳米圆柱体的动态磁化行为。假设在剩余物处存在两组上下磁化的圆柱体，并考虑圆柱体之间的偶极耦合，基于平均场方法的单一分析模型使我们能够满意地分析这两个系列的实验结果。该模型需要三个物理参数，使我们能够推导出平面内饱和场、无外加场时的特征频率以及平面内饱和场时的特征频率；这些参数使我们能够调整整个变化的特征频率相对于应用的领域。此外，在非饱和状态下，磁晶各向异性对频率软化的影响得到了明显的证明：当磁晶各向异性不消失时，这种影响更为明显，并增加了形状各向异性（Co c轴平行于圆柱体轴）；在其他情况下（Co c轴垂直于圆柱体轴或坡莫合金）软化较弱。
The static magnetization experimental behavior of cobalt (Co), Permalloy (Py), and nickel (Ni) nanocylinders is obtained from vibrating sample magnetometry while the dynamic behavior for the Co and Py ones is analyzed by means of Brillouin light scattering spectroscopy. Assuming the presence at remanence of two populations of cylinders with up and down magnetizations and including the dipolar coupling between the cylinders, a single analytical model based on a mean-field approach allowed us to satisfactorily analyze both series of experimental results. The model requires three physical parameters, allowing us to derive the in-plane saturation field, the eigenfrequency in the absence of applied field, and the eigenfrequency at the in-plane saturation field; these parameters enable us to adjust the whole variation of the eigenfrequency versus the applied field. Moreover, the effect of the magnetocrystalline anisotropy on the softening of the frequency in the nonsaturated state is clearly evidenced: it is more pronounced when the magnetocrystalline anisotropy is not vanishing and adds to the shape anisotropy (Co c-axis parallel to the cylinder axis); the softening being weak in the other cases (Co c-axis perpendicular to the cylinder axis or Permalloy).