Self-assembled FePt nanoparticles hold promise for future ultrahigh-density magnetic recording media because of their high anisotropy and capability to be formed into small and uniform grains. By using a special spin coater, we were able to form a dense array of FePt particles across the entire surface of a 2.5 in. disk substrate. Our method can control the number of layers of FePt nanoparticles. The media deposited with FePt nanoparticles by the spin coater was annealed in a vacuum. We measured read–write properties of the FePt nanoparticle media on a spin stand, and succeeded in detecting a signal of 290 kfci.

The independent-atom model (IAM) together with partial waves has been used to study the eKect of the absorption potential on the elastic scattering of electrons bythe carbon tetrafluoride molecule in the incident energy range 100-700eV. The atom is represented by an optical potential which is complex, spherically symmetric and energy dependent. The differential, integral elastic and momentum transfer cross sections have been obtained. The present results are in good agreement with the available experimental data.

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We have observed 23.2±6.0 +1.0 −0.9 purely-leptonic decays of D + s → µ + ν µ from a sample of muonic one prong decay events detected in the emulsion target of Fermilab experiment E653. Using the D + s → φµ + ν µ yield measured previously in this experiment,03. In addition, we extract the decay constant f Ds = 194 ± 35 ± 20 ± 14 M eV .

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