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Designing dielectric systems to create omnidirectional band gaps (OBGs) is an attractive topic in the field of photonic band gap (PBG) structures. In this Letter, we propose a new approach to create OBGs by ternary photonic heterostructures (TPHs) composed of three kinds of materials with different refractive indices and obtain the formulae of the structures of TPHs, i.e., those of the thicknesses...
The samples of Co(20 nm)/CoO(30 nm) were cooled from 300 K (above T N =290 K) to 100 K in various magnetic fields in the hard direction of the uniaxial anisotropy of Co layer. The hysteresis loops were measured in the direction parallel and perpendicular to the easy axis in the film plane at 100 K. The exchange bias field H E and the coercivity H C were found to change with...
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