He Yuping, Fu Junxue, Zhang Yang, Zhao Yiping, Zhang Lijiao, Xia Ailin, Cai Jianwang
Department of Physics and Astronomy and Nanoscale Science and Engineering Center, University of Georgia, Athens, GA 30602, USA.
Small. 2007 Jan;3(1):153-60. doi: 10.1002/smll.200600375.
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 approximately 1.98 mum were composed of alternating layers of amorphous Si nanorods approximately 580 nm in length and face-centered cubic Ni nanorods approximately 420 nm in length, both with a diameter of approximately 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 approximately 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.
利用多层掠角沉积技术在Si(100)上制备了一种两匝、八臂的矩形Si/Ni异质纳米弹簧结构。高度约为1.98μm的多层纳米弹簧由长度约580nm的非晶硅纳米棒和长度约420nm的面心立方镍纳米棒交替层组成，二者直径均约为35nm。纳米弹簧的磁各向异性表明，面内易轴和难轴分别平行和垂直于镍纳米棒平面。当纳米弹簧绕其面内难轴旋转时，面外磁滞回线对外加磁场方向非常敏感，磁化测量表明纳米弹簧向硅纳米棒平面倾斜约7.5度。纳米弹簧的磁各向异性由其结构决定，实验结果可用形状各向异性能量来解释。
