We report room temperature ferromagnetism in single crystal Ce1_ _ A .CoA .0 2__< 5 (xssO.OS) films deposited on a LaAlC^OOl) substrate. Films were grown by a pulsed laser deposition technique and were thoroughly characterized using x-ray diffraction, high-resolution transmission electron microscopy coupled with electron energy loss spectroscopy and scanning transmission electron microscopy-Z contrast, x-ray photoelectron spectroscopy, optical transmission spectroscopy, and magnetic measurements. These films are transparent in the visible regime and exhibit a very high Curie temperature ~740-875 K with a giant magnetic moment. Our results indicate that the ferromagnetic property is intrinsic to the C e02 system and is not a result of any secondary magnetic phase or cluster formation.
Infrared absorption spectra of GeO2-, P2O5-, and B2O3-doped fused silica and nondoped fused silica have been obtained in the 3–25-μm wavelength region. It is shown that the intrinsic infrared absorption loss of doped silica fiber increases by several orders of magnitude beyond 1.8–2.0 μm because of the overtone and combination tone vibrations of the SiO4 tetrahedron. The loss spectrum is affected by dopants, especially in the case of B2O3. The lower limit of attenuation in optical fiber is estimated to be about 0.2 dB/km at 1.6 μm.
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