Magnetic and Structural Properties of Granular Films Al₂O₃-FePd₃ Synthesized by Aluminothermy

Abstract:

The Al₂O₃-FePd₃ structure was fabricated by aluminothermy, or the Goldschmidt reaction. The initial structure was prepared by the formation of a highly-ordered L1₀-FePd epitaxial film with the use of the solid-state reaction in a Fe(001)/Pd(001) bilayer system on the MgO substrate. To obtain a granular structure, the L1₀-FePd samples were oxidized in air with the subsequent deposition of an aluminum layer onto their surface and vacuum annealing. Depending on annealing time and temperature, a system of L1₂-FePd₃ grains 5 nm in size was formed in an Al₂O₃ insulating matrix. Parameters of thermal treatment of the initial structure are presented, the occurring phase transformations are described, and the magnetic characteristics are measured. It is established that the ordered L1₀-FePd phase is obtained at an initiation temperature of the reaction of about 450 ^оС and the granular L1₂-FePd₃ system forms at 600-650 °С.

• Periodical: Solid State Phenomena (Volume 215)
• Pages: 218-222
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.215.218
• Online since: April 2014
• Authors: Victor S. Zhigalov*, V.G. Myagkov, V.A. Semyachkov, G.N. Bondarenko, I.V. Nemtsev
• Keywords: Aluminothermy, Goldschmidt Reaction, Granular Films, Solid-State Synthesis, Thin Magnetic Films

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DOI: 10.1016/j.jmmm.2011.12.005