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YIG, with the chemical formula Y 3 Fe 5 O 12 , is a garnet-type ferrite. It is a synthetic crystal of iron oxide with multiple magnetic properties. It belongs to the cubic crystal system and has good gyromagnetic effect, low saturation magnetization, and resonance.
Product Description
With the advantages of small line width, high resistivity, and low dielectric loss, it is widely used in the fields of optics and microwave, and is an important type of ferrite product. Yttrium iron garnet (YIG) has excellent optical and microwave properties. In the optical field, the Faraday effect of yttrium iron garnet can be used to manufacture products such as mid-infrared isolators, laser modulators, and optical fiber current sensors; in the microwave field, yttrium iron garnet has high Q resonance characteristics and can be used to manufacture magnetic Resonant filters, tuned oscillators, bandpass filters and other products.
Main Features
·Low temperature dependence of Faraday rotation
·1.2-5mm highly transparent
·High Q for microwave applications
·Grown with flux technology
Excellent performance for optical and microwave applications
Typical Applications
·Optical isolators
·Multiplexers
·Tuned oscillators
·Band stop filter
·Optical switch
·Magnetic field sensor
·Fiber optic sensor
Application Diagram
 |  |
| Figure 1: Faraday rotation | Figure 2: Magnetic resonance filtering |
Material Properties
| @ 25°C | Pure YIG | Ga:YIG |
| molecular formula | Y 3 Fe 5 O 12 | Y 3 Fe 4.05 Ga .95 O 12 |
| Molecular weight (grams) | 737.95 | 751.13 |
| Crystal structure | Cubic | Cubic |
| space point group | La3d | La3d |
| Density (g-cm 3 ) | 5.17 | 5.28 |
| Melting point (°C) | 1555 | 1545 |
| Hardness (moh) | 6.5-7.0 | |
| Lattice constant (Å) | 12.376 | 12.36 |
| Saturation magnetization (Gauss) | 1780 | 400 |
| Ferromagnetic Resonance Linewidth (Oe) | <0.30 | <0.95 |
| Magnetic anisotropy (erg/cm 3 ) | -6.20 x 10 -3 | -1.7 x 10 -3 |
| Magnetic anisotropy (erg/cm 3 ) | -0.05 x 10 -3 | -6.20 x 10 -3 |
| effective g factor | 2 | 2 |
| Gyromagnetic Ratio (MHz/Gauss -1 ) | 2.8 | 2.8 |
| Magnetostriction coefficient | -2.73 x 10 -6 | -0.95 x 10 -6 |
| -1.25 x 10 -6 | -0.95 x 10 -6 | |
| -2.20 x 10 -6 | ||
| Resistivity (Ù/cm) | 1 x 10 14 | |
| Young's modulus | 2 x 10 12 | 1 x 10 12 |
| Poisson's ratio | 0.29 | 0.25 |
| Dielectric constant | 15 | 15 |
| Curie temperature (K) | 553 | |
| Thermal conductivity (W/cm -1 /C -1 ) | 0.074 | |
| Coefficient of thermal expansion (℃ -1 ) | 1.04 x 10 -5 | |
| Refractive index , 1310 nm | 2.2 | |
| Refractive index , 1550 nm | 2.19 | |
| specific heat | 4.5 | |
| Optical absorption , 1310 nm (cm -1 ) | 0.05 | 0.05 |
| Faraday rotation , 1310 nm (mm -1 ) | 21.4 | 14.5 |
| Magneto-optic effect (A -1 ) | 0.14 | 0.6 |
| Transmittance1 (%) | >95 | >95 |
Product Parameter
| Faraday rotator | Length 2.1, 2.7mm |
| diameter | 1.8 to 5mm |
| Dimensional tolerance | Length: ±0.1mm, Diameter: ±0.05mm |
| Orientation | <100> |
| Flatness | <λ/4 @633nm |
| smoothness | 10/5 |
| Parallelism | <10′ |
| coating | Customized |
