Preparation and characterization of magnetic nanowires based on iron oxide

CÉSAR LEANDRO LONDOÑO CALDERÓN; V. BILOVOL; C. COSIO-CASTAÑEDA; L.G. PAMPILLO; S.R. MICHELI; K. PIROTA; L. M. SOCOLOVSKY; R. MARTÍNEZ-GARCÍA

Buenos Aires

Workshop; X-LAW3M Latin American Workshop on Magnetism; 2013

Latin American Workshop on Magnetism, magnetic materials and their applications

In this work we report the synthesis and characterization of magnetic nanowires based on iron oxide. The nanowires were obtained through the anodic nanoporous alumina filling with a inorganic precursor in a specific concentration. The process is performed using a method developed in our group which allows the formation of the crystalline phase inside the nanoporous substrate by a controlled heat treatment. Such synthesis process allows control the nanowires growth, which defines the morphology and physical properties of the obtained nanostructure (for example, magnetic behavior and transport properties). The nanowires were characterized using Scanning Electron Microscopy and High Resolution Transmission Electron Microscopy. The nanowires magnetic properties were studied by different measurements: Magnetization Zero Field Cooling, Magnetization Field Cooling, and Hysteresis curve. The characterization of the physical properties was complemented by Electron Paramagnetic Resonance measurements. The studies performed indicate the formation of nanowires built by a compact stacking of nanoparticles based iron oxide. The shape of the stacking, influenced by the geometry of the nanopore wherein the nanostructure is confined, indicates a crystal texture which determines a magnetic texture.