Major phase transformations and magnetic property changes caused by electromagnetic fields at microwave frequencies

Rustum Roy, Ramesh Peelamedu, Craig Grimes, Jiping Cheng, Dinesh Agrawal

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

We demonstrate in this paper that common crystalline phases can be made noncrystalline and hard magnets can be converted to soft magnets in the solid state in several seconds at temperatures far below the melting points. New crystal structures and magnetic structures of ferromagnetic oxides (ferrites such as BaFe12O19, CoFe2O4, Fe3O4, and ZnFe2O4, etc.) are formed by reacting either the stoichiometric mixture of oxides or the preformed phase-pure crystalline material in a pure H field (or E field) at microwave (2.45 GHz) frequencies. These major changes in the magnetic properties as well as major structural phase changes are caused by the magnetic field.

Original languageEnglish (US)
Pages (from-to)3008-3011
Number of pages4
JournalJournal of Materials Research
Volume17
Issue number12
DOIs
StatePublished - Dec 2002

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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