Nanospheres generate out-of-plane magnetization
Nanospheres generate out-of-plane magnetization
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DOI：
10.1063/1.3327797
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发表时间：
2010-03
影响因子：
3.2
通讯作者：
E. Amaladass;B. Ludescher;G. Schütz;T. Tyliszczak;M. Lee;T. Eimüller
中科院分区：
文献类型：
--
作者：
E. Amaladass;B. Ludescher;G. Schütz;T. Tyliszczak;M. Lee;T. Eimüller
在自组装的纳米球阵列上溅射沉积了Fe/Gd多层膜，制备了大型有序磁性纳米结构阵列。在平面衬底上，系统表现为平面内磁化，而在球体上则发生自旋再取向转变（SRT）到平面外取向。这种SRT不能仅仅解释为由于扩展膜成纳米尺寸的岛而导致的形状各向异性的减少。事实上，更重要的是纳米帽上薄膜的曲面。不同几何形状的微磁模拟结果表明，在1 μm ~ 20 nm的直径范围内，月牙形的磁膜可以获得理想的各向异性值。观察到的SRT使一种简单而经济的自下而上的方法能够产生图案垂直的磁性纳米结构，在磁性数据存储和自旋电子应用方面具有很高的潜力。
Large arrays of ordered magnetic nanostructures have been fabricated by sputter depositing Fe/Gd multilayers on an array of self-assembled nanospheres. On a planar substrate the system shows an in-plane magnetization whereas a spin reorientation transition (SRT) to out-of-plane orientation occurs on the spherules. This SRT cannot only be explained by the reduction in the shape anisotropy due to patterning of the extended film into nanometer sized islands. In fact, more important is the curved surface of the film on the nanocaps. Micromagnetic simulations of various geometries reveal that the crescent shape of the magnetic film on the spheres is ideal to get small values of the shape anisotropy for all diameters of the spheres, ranging from 1 μm down to 20 nm. The observed SRT enables a simple and cost effective bottom-up approach to produce patterned perpendicular magnetic nanostructures, having a high potential for magnetic data storage and spintronic applications.