Download High Density Data Storage: Principle, Technology, and by Yanlin Song, Daoben Zhu PDF

By Yanlin Song, Daoben Zhu

The explosive bring up in details and the miniaturization of digital units call for new recording applied sciences and fabrics that mix excessive density, quickly reaction, lengthy retention time and rewriting potential. As estimated, the present silicon-based computing device circuits are achieving their actual limits. additional miniaturization of the digital elements and bring up in information garage density are important for the subsequent iteration of IT gear reminiscent of extremely high-speed cellular computing, communique units and complicated sensors. This unique booklet provides a finished creation to the numerous learn achievements on high-density information garage from the features of recording mechanisms, fabrics and fabrication applied sciences, that are promising for overcoming the actual limits of present info garage platforms. The booklet serves as an valuable advisor for the advance of optimized fabrics, applied sciences and equipment buildings for destiny info garage, and may lead readers to the attention-grabbing global of data expertise sooner or later.

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E. mixing the donor and acceptor in a polar solvent, and the CT salt can be precipitated by adding a nonpolar solvent (see Fig. 16). The choice of solvent for the synthesis is very important. 138 Considering the stability, synthesis of some CT salts requires an inert atmosphere and a special low temperature. qxd 3/16/2009 3:14 PM Page 43 High Density Magnetic Data Storage 43 Fig. 15. 7 K. (Figure (b) is reprinted with permission from Ref. 143, © 1987, American Physical Society). R R M R R R R M R R Fig.

5. Single molecule magnets The above molecule-based magnetic compounds normally contain few transition metal ions, such as Mn, Fe, V, Ni, Cr and Co. Another type of molecule-based magnetic compounds is several polynuclear cage metal complexes with a large spin S, resulting from the intramolecular exchange between the transition metal ions in the cluster. This opened up a new area of high spin metal clusters, termed “single molecule magnets” (SMMs). The first identified SMM was a manganese oxide cluster with acetate ligands, Mn12O12(O2CCH3)16(H2O)4, which was synthesized by the reaction of Mn(O2CCH3)2 with KMnO4 in CH3COOH and water solution.

161, © 2005, University of Florida) easy axis. 5 cm−1. e. 2S + 1) sublevels, the energy of each sublevel E = ms2D (ms, spin projection quantum number — S ≤ ms ≤ S). qxd 3/16/2009 3:14 PM Page 49 High Density Magnetic Data Storage 49 orientations: spin-up and spin-down), the energy of sublevels is lowest; and when ms = 0, the energy is highest. As a consequence, there is a spin reversal energy barrier, U = S2|D | (for the Mn12 cluster, U = 100|D | = 50 cm−1), between the two spin orientations of the magnetic moment.

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