title: Pulsed laser deposition of nanoporous cobalt thin films.
abstract: 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 approsimately 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.
authors.affiliation: Department of Biomedical Engineering, University of North Carolina, Chapel Hill, NC 27599, USA.
authors.forename: Chunming
authors.initials: C
authors.lastname: Jin
authors.forename: Sudhakar
authors.initials: S
authors.lastname: Nori
authors.forename: Wei
authors.initials: W
authors.lastname: Wei
authors.forename: Ravi
authors.initials: R
authors.lastname: Aggarwal
authors.forename: Dhananjay
authors.initials: D
authors.lastname: Kumar
authors.forename: Roger J
authors.initials: RJ
authors.lastname: Narayan
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D007834:Lasers; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008567:Membranes, Artificial; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D016062:Porosity; D013499:Surface Properties; D013696:Temperature
chemical_list: D046911:Macromolecular Substances; D008567:Membranes, Artificial; D003035:Cobalt