1,721,600 research outputs found
Scrap: Data reorganization and placement of two dimensional scalable video in a disk array-based video server
No full textIEEE Computer Socieit
Calculation of the magnetization oscillation frequency in a nanostructured synthetic ferrimagnet
No full textTheoretical equations were derived for the resonance frequency of magnetization oscillation in a nanostructured synthetic ferrimagnet in the framework of a single domain model. The theoretical equations, which are applicable to various magnetization alignments including a spin flop, were then tested using a micromagnetic simulation in both the macrospin and microspin models. Excellent agreement was obtained between the results of the theoretical prediction and micromagnetic simulation in the macrospin model over the entire range of applied magnetic fields, confirming the validity of the theoretical equations derived in this study. The agreement between the results from the theoretical prediction and the micromagnetic simulation in the microspin model was not excellent, particularly in the acoustic mode, showing a substantial deviation from the ideal single domain behaviour. However, good agreement was obtained by decreasing the magnetization component in the thickness direction by 10% of that in the single domain state. This suggests that the magnetization deviates slightly from the single domain state as the magnetization moves out of the film plane during a magnetization oscillation.
Effects of the thickness asymmetry of nanostructured exchange-coupled trilayers on their dynamic magnetization switching
No full textThe effects of thickness asymmetry (Delta t) on the dynamic magnetization switching of exchange-coupled trilayers are investigated in this study. Elliptical thin films that have lateral dimensions of 200x100 nm(2) are considered. A significant difference in the dynamic switching behavior is observed depending on Delta t. Both the switching field and the switching time decrease as Delta t increases. A Fourier analysis of the magnetization oscillation, which is followed by the initial coherent rotation, shows multiple oscillation frequencies. This tendency is more pronounced at a larger Delta t. The main oscillation frequency tends to increase with an increase in Delta t. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.3001805]
PFFS: A scalable flash memory file system for the hybrid architecture of phase-change RAM and NAND flash
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