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Advanced magnetic materials and new characterization techniques

Grant number: 05/57825-5
Support type:Research Projects - Thematic Grants
Duration: March 01, 2007 - February 28, 2011
Field of knowledge:Physical Sciences and Mathematics - Physics
Principal Investigator:Antonio Domingues dos Santos
Grantee:Antonio Domingues dos Santos
Home Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated scholarship(s):09/00503-7 - Study of composites of hard and soft magnetic materials produced using the gas aggregation methodology, BP.DR
08/09023-5 - Production of microscopic magnetic devices by direct write optical lithography based on near-field optics, BP.IC
08/07138-0 - Production and characterization of noble metal nanoparticles in dielectric matrix, BP.IC
+ associated scholarships 08/07145-6 - Production of tips for SNOM with sub-micrometric aperture, BP.IC
07/06388-0 - Study on the magnetic behavior of magnetite nanoparticles and nickel nanowires diluted in nematic fluids, BP.MS
06/04783-6 - Chemical synthesis and characterization of magnetic nanoparticles, BP.PD - associated scholarships

Abstract

Within this project the Magnetic Materials Laboratory (LMM) aims at producing state-of-the-art knowledge on a series of topics in applied magnetism. Specific objectives are: (1) To develop new magneto-optical techniques for the characterization of magnetic materials at microscopic and nanoscopic scales. (2) To investigate the structural, magnetic and transport properties of magnetite (Fe3O4) films obtained by chemical vapor deposition. (3) To investigate structural and magnetic properties of FePt and CoPt thin films showing perpendicular anisotropy. (4) To develop and operationalize a prototype microSQUID of (1 um)2 size by means of lithographic techniques. (5) To prepare and characterize MnO+(Fe, Co, or Ni) composites, in two geometries (bilayers, by sputtering, and nanopowders, by mechanosynthesis), aiming at increasing coercivity through exchange bias. (6) To make ferromagnetic nanowires with different geometric parameters and study their static and dynamic magnetic properties. (7) To investigate the influence of Zr and TiC addition on hard-magnetic properties of Sm-Co and Pr-Fe-B based permanent magnets. (8) To develop Fe-Pt alloy thin films with a negative thermal expansion coefficient, to be applied in read/write heads for hard disk memories. (9) To study the magnetic properties of MFe204 (M=Fe, Co, Ni. Cu) ferrite nanoparticles for ferrofluids; in particular, investigate the particle size effect on volume and surface anisotropies and on the cationic redistribution among transition-metal sites in the spinel structure. (10) To develop a purely physical method, based on sputtering deposition, to produce magnetic nanoparticles imbedded in a nonmagnetic matrix and vice-versa. (11) To investigate the magnetic properties of iron oxide (Fe304 and y¬Fe203) nanoparticles encapsulated in biocompatible materials for pharmacological and clinical applications. (12) To obtain bulk metallic glasses (BMG's) with high soft magnetic properties, by means of fast cooling alloys of special compositions. (AU)