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Nanometer-thick Y 3 Fe 5 O 12 (YIG) films with very low damping constant have been fabricated on gadolinium gallium garnet substrates using chemical metal-organic decomposition method. Both the microstructure and ferromagnetic properties of the YIG thin films have been studied. High resolution X-ray diffraction result displayed an epitaxial structure of the YIG film. Surface morphology was investigated using an atomic force microscopy. The average surface roughness is about 0.8 ± 0.2 nm for a ∼50 nm thick epitaxial growth YIG film, which is comparable to the result of pulse laser deposition grown films. The coercivity field of the YIG film is around 1.5 Oe. Furthermore, magnetization dynamics properties were studied using a coplanar waveguide vector-network-analyzer ferromagnetic resonance spectrometer. The extracted damping constant is as low as 1.4 × 10 −3 . The results show that high quality nanometer YIG films can be obtained through chemical epitaxial growth method. It would be very useful for the garnet based spintronics applications. [ABSTRACT FROM AUTHOR]

• Width modes and shape anisotropy are essential for finite width magnetic waveguides. • Width modes help to bend the signal transmission direction in cross-like structures. • Shape anisotropy provides the transmission in the crosses in a wide frequency range. • The inhomogeneity of the waveguide width can filter width modes. • Using a resonator as a waveguides junction can help for effective signal transfer. Microwaveguides for spin waves based on yttrium iron garnet films and cross-like structures built on such waveguides are experimentally studied. Effects of the waveguides geometry, location of the microantennas for excitation and detection of the spin waves, and geometry of the waveguides junctions on the spin wave excitation and propagation efficiency are discussed. [ABSTRACT FROM AUTHOR]