School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA.
Nanoscale. 2017 Jun 14;9(23):7970-7976. doi: 10.1039/c7nr01122a.
A simple one-step pulsed laser deposition (PLD) method has been applied to grow self-assembled metal-oxide nanocomposite thin films. The as-deposited Co-BaZrO films show high epitaxial quality with ultra-fine vertically aligned Co nanopillars (diameter <5 nm) embedded in a BZO matrix. The diameter of the nanopillars can be further tuned by varying the deposition frequency. The metal and oxide phases grow separately without inter-diffusion or mixing. Taking advantage of this unique structure, a high saturation magnetization of ∼1375 emu cm in the Co-BaZrO nanocomposites has been achieved and further confirmed by Lorentz microscopy imaging in TEM. Furthermore, the coercivity values of this nanocomposite thin films range from 600 Oe (20 Hz) to 1020 Oe (2 Hz), which makes the nanocomposite an ideal candidate for high-density perpendicular recording media.
一种简单的一步脉冲激光沉积（PLD）方法已被应用于生长自组装金属氧化物纳米复合材料薄膜。沉积的 Co-BaZrO 薄膜表现出超高的外延质量，具有嵌入 BZO 基质中的超细垂直定向 Co 纳米柱（直径<5nm）。通过改变沉积频率可以进一步调节纳米柱的直径。金属和氧化物相分别生长，没有相互扩散或混合。利用这种独特的结构，在 Co-BaZrO 纳米复合材料中实现了约 1375 emu cm 的高饱和磁化强度，并通过 TEM 中的洛伦兹显微镜成像进一步证实。此外，这种纳米复合材料薄膜的矫顽力值范围从 600 Oe（20 Hz）到 1020 Oe（2 Hz），这使得纳米复合材料成为高密度垂直记录介质的理想候选材料。
