Bismuth-substituted iron garnets are considered to be the most promising magneto-optical materials because of their excellent optical transparency and very high magneto-optical figures of merit in the nearinfrared spectral region. However, the practical application of garnets in the visible and short-wavelength infrared parts of spectrum is currently limited, due to their very high optical absorption (especially in sputtered films) in these spectral regions. In this paper, we identify the likely source of excess absorption observed in sputtered garnet films in comparison with epitaxial layers and demonstrate (Bi,Dy) 3 (Fe,Ga) 5 O 12 : Bi 2 O 3 composites possessing record MO quality in the visible region.

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The reaction of NiCI 2 9 6H20 with Me3CCOOH and KOH taken in a molar ratio of 1 : 2 : 2 in water afforded the nonanuclear anti.ferromagnetic complex [Nig(Me3CCOOH)4(p4-O)3(I~3-OH)3(OOCCMe3)I2], which apparently contains Ni II and Ni III atoms. The complex was isolated by extraction with CH2C12, benzene, or hexane. The reactions of this complex with pyridine bases (pyridine (Py), 3,4-1utidine (Lut), and nicorandil (Nic)) gave the adducts L4Ni2(OOCCMe3)2(~t-OOCCMe3)2(tt-OH) (L = Py, Lut, or Nic, respectively). According to magnetic measurements, intramolecular ferromagnetic exchange interactions in these adducts are complemented by intermoleeular antiferromagnetic interactions. Pyrolysis of the pyridine adduct in air or under an inert atmosphere in xylene yielded the antiferromagnetie complex Py2Ni2(Me3CCOOH)2(OOCCMe3)2(~t-OOCCMe3)2(~.-OH2), which contains Ni 11 atoms. The structures of all the complexes synthesized were established by X-ray diffraction analysis. The electronic absorption spectra of these compounds are considered.

We have established a set of technologies for the deposition and annealing of magneto-optic ferrite and paramagnetic garnets, as well as multilayer nanostructures which are based on these materials, for use in magnetic photonic crystals. Transmission electron microscope analysis has been performed to investigate the structure of both amorphous and crystallized garnet layers, nanocrystallites and layer interfaces within all-garnet heterostructures.

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