Glass composite including dispersed rare earth iron garnet...

Details Glass composite including dispersed rare earth iron garnet... Glass composite including dispersed rare earth iron garnet...

2006-07-18

2006-07-18

Parker, Fred J. (Department: 1762)

Coating processes

Magnetic base or coating

Magnetic coating

C427S128000, C427S165000, C427S169000, C427S443200

Reexamination Certificate

active

07078071

ABSTRACT:
Glass
anoparticle composites are provided which include a glass matrix with a high density of heterologous nanoparticles embedded therein adjacent the outer surfaces of the composite. Preferably, the glass matrix is formed of porous glass and the nanoparticles are yttrium-iron nanocrystals which exhibit the property of altering the polarization of incident electromagnetic radiation; the composites are thus suitable for use in electrooptical recording media. In practice, a glass matrix having suitable porosity is contacted with a colloidal dispersion containing amorphous yttrium-iron nanoparticles in order to embed the nanoparticles within the surface pores of the matrix. The treated glass matrix is then heated under time-temperature conditions to convert the amorphous nanoparticles into a crystalline state while also fusing the glass matrix pores. Nanoparticle loadings on the order of 109nanoparticles/mm2of glass surface area are possible, allowing construction of recording media having a recordable data density many times greater than conventional media.

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Taketomi, S. et al., “Peculiar sponge-like structure of yttrium-iron-garnet nanocrystals on quarts substrate surface,” Journal of Applied Physics, vol. 386, No. 10, Nov. 15, 1999.
Taketomi, S. et al., “Structural effects on the magnetic character of yttirum-iron-garnet nanoparticles dispersed in glass composites,” Journal of Applied Physics, vol. 93, No. 10, May 15, 2003, date.
Taketomi, S. “Morphology of Iron-Oxide Nanoparticle-Dispersed Glass Composites,” The Japan Society of Applied Physics, vol. 43, No. 10, 2004, pp. 7350-7353, date.

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