Thin films composed of MgAl 2 O 4 and (Ni 0.5 Zn 0.5 )Fe 2 O 4 ([MA(100 − x)-NZFx] films) were grown on fused SiO 2 substrates by pulsed laser deposition. X-ray diffraction measurements revealed that the films were polycrystalline, and that their lattice constant varied linearly with composition, indicating the formation of a solid solution. The film with x = 60 was paramagnetic and those with x 70 were ferromagnetic. The films had a transparency above 75% in the visible range, but the transparency decreased with the x value. The optical band gaps were 2.95, 2.55, 2.30 and 1.89 eV for x = 20, 40, 60, 80 and 100, respectively. The Faraday rotation angle increased with x in the visible range, and the film with x = 70 exhibited a value of 2000 degrees cm −1 at 570 nm, which is comparable to the rotation angle of Y 3 Fe 5 O 12 . Owing to their high transparency, which extends into the visible range, the [MA(100 − x)-NZFx] films can be used in novel magneto-optical devices.Keywords: transparent magnetic thin film, solid solution of nickel zinc ferrite and magnesium aluminum spinel, Faraday rotation angle, pulsed laser deposition (PLD)
Recently, Content-Centric Networking (CCN) has emerged as a new networking paradigm. The main features of CCN architecture are in-network caching and content-based routing. Cache replacement and decision policies have been discussed as important mechanisms of in-network caching in past literature. However, these policies cannot efficiently support streaming. In this paper, we propose an in-network caching method for reducing playback interruption time of on-demand streaming over CCN through efficient use of network resources. The proposed method splits streaming content data into chunks with fixed size and stores these chunks into the cache storage of each CCN router in order to reduce playback interruption time for streaming. Experimental evaluations show that the proposed in-network caching method outperforms in-network caching methods of the original CCN architecture in terms of playback interruption time.
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