RESEARCH AND DEVELOPMENT OF YTTRIUM IRON GARNET SINGLE CRYSTALS

Abstract

Yttrium iron garnet (YIG) single crystals 1/4 to 3/8 in. diameter with a dielectric constant of about 10 and 0.002 dissipation factor were produced by the floating zone techni ue. Ferrimagnetic r sonance line-widths of less than 2 oersteds were obtained from polished test spheres. Crack formation remains a major problem in growing YIG crystals by the floating zone technique. The occasional appearance of a mixture of YIG and iron oxide crystals as a second phase inclusion in YIG was related to zone temperature fluctuations. It is postulated that this second phase formation can be prevented by better temperature control and decreased zoning rate (0.10 in./hr.). Increasing the availability of active oxygen is discussed as a possible method of decreasing the divalent iron concentration in YIG. This action would favorably influence line-width. (Author)

Document Details

Document Type
Technical Report
Publication Date
May 30, 1962
Accession Number
AD0277641

Entities

Organizations

  • Texas Instruments

Tags

DTIC Thesaurus Topics

  • Crystals
  • Dielectric Permittivity
  • Dissipation
  • Dissipation Factor
  • Garnet
  • Iron
  • Iron Oxides
  • Single Crystals
  • Temperature Control
  • Yttrium
  • Yttrium Iron Garnet

Fields of Study

  • Physics

Readers

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  • Materials Science and Engineering.
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