Vertical La0.7Ca0.3MnO3 nanorods tailored by high magnetic field assisted pulsed laser deposition.
Vertical La0.7Ca0.3MnO3 nanorods tailored by high magnetic field assisted pulsed laser deposition.
复制标题
高磁场辅助脉冲激光沉积垂直La0.7Ca0.3MnO3纳米棒
DOI：
10.1038/srep19483
复制
发表时间：
2016-01-18
影响因子：
4.6
通讯作者：
Du Y
中科院分区：
文献类型：
--
作者：
Zhang K;Dai J;Zhu X;Zhu X;Zuo X;Zhang P;Hu L;Lu W;Song W;Sheng Z;Wu W;Sun Y;Du Y
采用自行研制的强磁场辅助脉冲激光沉积（HMF-PLD）技术在（LaAlO 3）0.3（Sr 2AlTaO 6）0.7（001）[LSAT（001）]单晶衬底上制备了La0.7Ca0.3MnO3（LCMO）薄膜。在5 T以上的强磁场下可以得到尺寸均匀、垂直排列的纳米棒结构，并且纳米棒的尺寸可以通过改变磁场来控制。结果表明，磁各向异性与纳米棒的尺寸大小密切相关。由于LCMO薄膜的纳米棒之间的垂直晶界处的载流子散射增强，可以在100 K下在0.5 T下获得-36%的显著增强的低场磁电阻（LFMR）。纳米棒的生长机制也进行了讨论，这可以归因于沉积速率的变化，吸附原子的表面扩散，和成核诱导的应用程序中的高磁场的薄膜处理。这种垂直纳米棒结构的成功实现将为研究这些纳米结构的物理性质和实现纳米器件操纵提供指导性路线。
La0.7Ca0.3MnO3 (LCMO) thin films on (LaAlO3)0.3(Sr2AlTaO6)0.7 (001) [LSAT (001)] single crystal substrates have been prepared by high magnetic field assisted pulsed laser deposition (HMF-PLD) developed by ourselves. Uniformly sized and vertically aligned nanorod structures can be obtained under an applied high magnetic field above 5 T, and the dimension size of the nanorods can be manipulated by varying the applied magnetic field. It is found that the magnetic anisotropy is strongly correlated to the dimension size of the nanorods. A significantly enhanced low-field magnetoresistance (LFMR) of −36% under 0.5 T at 100 K can be obtained due to the enhanced carrier scattering at the vertical grain boundaries between the nanorods for the LCMO films. The growth mechanism of the nanorods has been also discussed, which can be attributed to the variation of deposition rate, adatom surface diffusion, and nucleation induced by the application of a high magnetic field in the film processing. The successful achievements of such vertical nanorod structures will provide an instructive route to investigate the physical nature of these nanostructures and achieve nanodevice manipulation.