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- W1998422741 abstract "The effects of the heat treatment of Bi-substituted magnetic garnets in a flowing oxygen containing ozone with less than a few vol % (O3 annealing) on the optical absorption α in a near-infrared spectral region and on the ferromagnetic resonance linewidth ΔH have been investigated in detail. By O3 annealing for typically 3 h at a temperature of 700 °C and subsequent O2 annealing around 500 °C, the α is reduced to less than 1 dB/cm at a wavelength of 1.3 μm, and also the ΔH is reduced to 0.8 Oe at 9 GHz in a very reproducible manner. The reduction of both α and ΔH is thought to be caused by the decrease of Fe2+ ions originally formed mainly by oxygen vacancies. The only negative point of O3 annealing is that it inevitably accompanies some surface damage probably caused by the attack of oxygen atom radicals produced by the thermal dissociation of ozone which affects magnetostatic surface waves so as to increase the insertion loss. However, this problem has been successfully solved by protecting the surface with a thin oxide layer such as a Ta2O5 on. O3 annealing with a protective oxide layer on is extremely valuable because α is still reduced effectively and magnetostatic surface waves can propagate with a smaller insertion loss." @default.
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- W1998422741 date "1990-01-15" @default.
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- W1998422741 title "Improvements of optical and microwave properties of Bi-substituted magnetic garnets by O3 annealing" @default.
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- W1998422741 doi "https://doi.org/10.1063/1.345704" @default.
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