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Additional resources for High Density Data Storage: Principle, Technology, and Materials
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.