Pulsed Laser Deposition of Nanoporous Cobalt Thin Films

作者：Jin Chunming; Nori Sudhakar; Wei Wei; Aggarwal Ravi; Kumar Dhananjay; Narayan Roger J^*

来源：Journal of Nanoscience and Nanotechnology, 2008, 8(11): 6043-6047.

DOI：10.1166/jnn.2008.483

• Magnetization Curves
• Epitaxial Films
• Magnetic Nano-Networks

Nanoporous cobalt thin films were deposited on anodized aluminum oxide (AAO) membranes at room temperature using pulsed laser deposition. Scanning electron microscopy demonstrated that the nanoporous cobalt thin films retained the monodisperse pore size and high porosity of the anodized aluminum oxide substrates. Temperature- and field-dependent magnetic data obtained between 10 K and 350 K showed large hysteresis behavior in these materials. The increase of coercivity values was larger for nanoporous cobalt thin films than for multilayered cobalt/alumina thin films. The average diameter of the cobalt nanograins in the nanoporous cobalt thin films was estimated to be similar to 5 nm for blocking temperatures near room temperature. These results suggest that pulsed laser deposition may be used to fabricate nanoporous magnetic materials with unusual properties for biosensing, drug delivery, data storage, and other technological applications.

• 出版日期2008-11