The single crystalline material is usually grown from flux melts. The preparation of optically polished spheres with diameters of around 0.3 mm is based on pieces in the shape of cubes (upper picture), which are sliced and diced from the single crystals. Finally, the cubes are shaped into spheres (lower picture) and their surfaces are polished to a high degree of perfection. The saturation polarization 4pMs of the spheres is dependent on the substitution level of diamagnetic ions and can be determined as the distance between the (210) Walker and the homogeneous precession mode (left graph). Typical values of the full width of the half maximum of the ferromagnetic resonance ΔH are less than 1 Oe (right graph).

Typical half-value widths for the ferromagnetic resonance line width ΔH are less than 1 Oe

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YIG single crystals are most commonly used for the construction of electronically tunable oscillators (YIG oscillator) and filters. For the set-up of such components magnetically tunable resonators are being deployed. As major frequency-determining component YIG single crystals are applied.