Multilayered Si/Ni nanosprings and their magnetic properties
Multilayered Si/Ni nanosprings and their magnetic properties
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DOI：
10.1002/smll.200600375
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发表时间：
2007-01-01
期刊：
影响因子：
13.3
通讯作者：
Cai, Janwang
中科院分区：
文献类型：
--
作者：
He, Yuping;Fu, Junxue;Cai, Janwang
在Si（100）上采用多层扫角沉积技术制备了两匝、八臂、矩形Si/Ni非均质纳米弹簧结构。该多层纳米弹簧由长度约为580 nm的非晶硅纳米棒和长度约为420 nm的面心立方Ni纳米棒交替组成，高度约为1.98 μ m，直径均约为35 nm。纳米弹簧的磁各向异性表明，平面内的易轴和硬轴分别平行于Ni纳米棒平面和垂直于Ni纳米棒平面。当纳米弹簧绕其面内硬轴旋转时，面外磁滞回线对外加磁场方向非常敏感，并且磁化测量显示纳米弹簧向Si纳米棒的平面倾斜约7.5度。纳米弹簧的磁各向异性是由其结构决定的，实验结果可以用形状各向异性能量来解释。
A two-turn, eight-armed, rectangular Si/Ni heterogeneous nanospring structure on Si(100) has been fabricated using a multilayer glancing-angle deposition technique. The multilayered nanosprings with a height of approximate to 1.98 mu m were composed of alternating layers of amorphous Si nanorods approximate to 580 nm in length and face-centered cubic Ni nanorods approximate to 420 nm in length, both with a diameter of approximate to 35 nm. The magnetic anisotropy of the nanosprings showed that the in-plane easy and hard axes were parallel and perpendicular to the Ni nanorod plane, respectively. The out-of-plane magnetic hysteresis loop was very sensitive to the applied magnetic field direction when rotating the nanosprings about their in-plane hard axis, and the magnetization measurement revealed that the nanosprings tilted at approximate to 7.5 degrees toward the plane of the Si nanorods. The magnetic anisotropy of the nanosprings is determined by their structure, and the experimental results can be interpreted by the shape anisotropy energy.