By Yanlin Song, Daoben Zhu
ISBN-10: 9812834699
ISBN-13: 9789812834690
The explosive bring up in info 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 power. As estimated, the present silicon-based computing device circuits are attaining their actual limits. extra miniaturization of the digital parts and elevate in info garage density are very important for the following new release of IT apparatus equivalent to extremely high-speed cellular computing, conversation units and complex sensors. This unique e-book provides a finished creation to the numerous study achievements on high-density facts garage from the facets of recording mechanisms, fabrics and fabrication applied sciences, that are promising for overcoming the actual limits of present info garage platforms. The ebook serves as an precious consultant for the advance of optimized fabrics, applied sciences and machine buildings for destiny details garage, and should lead readers to the attention-grabbing international of knowledge expertise sooner or later.
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Extra info for High Density Data Storage: Principle, Technology, and Materials
Sample text
Zhang and Y. Song F R2 N F N N NC R1 N N p-CDpOV (R1 = Cl, R2 = Ph) Fig. 13. N S N S N S N R2 S F S F p-NCC6F4CNSSN TTTA Some examples of verdazyl radicals and sulfur-based radicals. 3. Fullerenes Tetrakis(dimethylamino)ethylene-fullerene(60) (TDAE-C60) is a donor– acceptor type magnetic material. 132 Fresh single crystals of TDAE-C60 grown below 10°C (the α-phase), show no ferromagnetic behavior when cooled down to 2 K [Figs. 132 The different properties between these two crystal forms come from the different orientation of the C60 molecules in the two-phases [Fig.
During this tunneling process, molecules on the ground state (ms = ±10, either one) sublevel are first thermally activated to higher sublevels, through which tunneling of the magnetization occurs. The difference between these two magnetic relaxations can be attributed to the greater transverse antisotropy, which leads to a high degree of mixing between the ms = ±10 levels and facilitates tunneling. 2 nm), synthesized by the reaction of Mn12 acetate clusters with a premanganate salt. The cluster crystallizes in hexagonal arrays, like a holiday wreath.
57 The coercivity Hc and the remnant-to-saturation magnetization ratio Mr /Ms (also called remnant squareness, S ) of magnetic particles are dependent of the size of particles,82,83 as shown in Fig. 7. The above two properties have maximum values when the size of particles reaches the critical value, depending on the chemical composition and crystalline structure of the particles. For instance, the critical size is 20~40 nm for the CoNi alloy system,84 where the nanoparticles have the highest coercivities.