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Circulators which can be operated at cryogenic temperatures are discussed. Both symmetrical Y-junction circulators using polycrystalline ferrimagnetic garnets and hybrid-gyrator circulators using single crystals are evaluated. The temperature dependence of the ferromagnetic resonance losses of polycrystalline aluminum-doped and undoped yttrium iron garnet is reported. Device performance is evaluated in terms of the measured material properties.

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