Nanostructuring and Texturing for Improved Magnetic Materials

David J. Sellmyer, Y. Liu, T. A. George

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The concept of achieving a useful high-energy-product magnet through appropriate nanostructuring of known hard and soft phases has been tantalizing researchers since the idea was first proposed. The fabrication of exchange-coupled nanocomposite magnets faces several challenges including aligning the easy anisotropy axes of the hard-phase grains. Here we investigate experimentally two-phase nanostructures of hard Ll0-ordered FePt and soft iron-rich fee Fe(Pt). The Fe-Pt thin films were produced by epitaxial cosputtering onto MgO (001) single-crystal substrates which lead to strong (001) texturing. The measured hysteresis loops indicate nearly ideal exchange coupling. Excellent magnetic properties are obtained, with largest values of coercivity (51 kOe), saturationmagnetization (1287 emu/ cm3, Js = 16.2 kG), and nominal maximum energy product (58 MGOe).

Original languageEnglish (US)
Title of host publicationEnergy Technology 2012
Subtitle of host publicationCarbon Dioxide Management and Other Technologies
PublisherJohn Wiley and Sons
Pages393-401
Number of pages9
ISBN (Print)9781118291382
DOIs
StatePublished - May 15 2012

Keywords

  • Magnetic Materials
  • Nanoindentation
  • Transmission Electron Microscopy

ASJC Scopus subject areas

  • Materials Science(all)

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