• Journal of the Korean Ceramic Society
• /
• v.38 no.11
• /
• pp.1008-1014
• /
• 2001

Nanosize YIG powders added by Cerium which is exellent element in magneto-optical effect were synthesized by Sol-Gel method using Ethylene Glycol solvent. In 120 to 150 minute reaction time, stable sol solution which showed no change in viscosity, pH, and aging time was obtained. Monolithic YIG was synthesized at 80$0^{\circ}C$ with DTA and XRD measurement and its lattice parameter had a tendency to increase from 12.3921 $\AA$. Increasing annealing temperature from 80$0^{\circ}C$ to 105$0^{\circ}C$, average particle size was in the range of 40 nm to 330 nm. Saturation magnetization (M$_{s}$) value was increased from 18.37 to 21.25 emu/g due to enhancement of YIG crystallity and decreasing of orthoferrite phase. On the other hand, coercivity (H$_{c}$) value increased up to 90$0^{\circ}C$ and then decreased above 90$0^{\circ}C$. With increasing Ce addition, coercivity was almost not changed but saturation magnetization value was maximum at Ce 0.1 mol% and then decreased because of increasing a orthoferrite amount. Also, curie temperature (T$_{c}$) of YIG were not changed with Ce addition.ion.

• Proceedings of the Korean Magnestics Society Conference
• /
• 1998.05a
• /
• pp.94-95
• /
• 1998

• Proceedings of the Korean Magnestics Society Conference
• /
• 1993.11a
• /
• pp.58-59
• /
• 1993

• Proceedings of the Korean Magnestics Society Conference
• /
• 1994.10a
• /
• pp.56-57
• /
• 1994

• Proceedings of the Korean Magnestics Society Conference
• /
• 1999.04a
• /
• pp.112-113
• /
• 1999

• Proceedings of the Korean Magnestics Society Conference
• /
• 2000.05a
• /
• pp.72-73
• /
• 2000

• Proceedings of the Korean Magnestics Society Conference
• /
• 1999.10a
• /
• pp.86-87
• /
• 1999

• Proceedings of the Korean Magnestics Society Conference
• /
• 2005.06a
• /
• pp.144-145
• /
• 2005

• Journal of the Korean Institute of Telematics and Electronics
• /
• v.8 no.4
• /
• pp.25-30
• /
• 1971

Fabrication and measurements of the magnetically tunable YIG band pass or stop filter at X-band are discussed. Using two YIG spheres located at the region of r-f circularly polarized magnetic field between the strip lines, the pass or stop characteristics of the filter are obtained. In the case of band stop, the output level is typically 25db lower than the input power. Contrarily for the pass band, the pass band level is 22db higher than the stop frequency region. The experimental results are in good agreement with the theoretical values of FMR. Further it is shown that the structure can be used for a directional coupler.

• Journal of Magnetics
• /
• v.12 no.3
• /
• pp.129-132
• /
• 2007

Bismuth-substituted yttrium iron garnet (Bi:YIG, $Bi_{0.5}Y_{2.5}Fe_5O_{12}$) films were deposited with aerosol deposition method and their magnetic and optical properties were investigated as a function of annealing temperature. Since the ceramic films deposited with aerosol deposition method have not a perfect crystal structure due to non-uniform internal stress occurred by mechanical collision during their deposition, the post annealing could be a key process to release its internal stress and to improve its micro structure for optimizing the magnetic and magneto-optic properties of films. The crystallinity of Bi: YIG film was improved with increase of annealing temperature, and the saturation magnetization increased up to 87 emu/cc at $800^{\circ}C$. The Faraday rotation increased up to $1.4deg/{\mu}m$ by annealing at $700^{\circ}C$ around the wavelength of $0.5{\mu}m$. The optical transmittance of the Bi:YIG film was also improved in visible region.