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Ultrapure preparation conditions equivalent to ultrahigh vacuum conditions of 5 x [10.sup.-10] mbar allow the reproducible deposition of magnetic films in the monolayer (ML) range from aqueous electrolytic solutions. We used this cost and time efficient technique to prepare ultrathin Co films on Cu(001) substrates. A unique feature of electrodeposition is its ability to dissolve previously deposited layers. The thickness of deposited films can be adjusted in situ by dissolution without damaging the rest of the film. This might be useful in precisely tailoring film properties, for example in magnetic multilayers. In situ magneto-optical Kerr effect (MOKE) measurements are a simple and efficient tool for such a purpose and provide a thickness resolution of better than 0.2 ML. The magnetic properties and anisotropies of the electrodeposited films as derived from our in situ MOKE measurements are mainly determined by their epitaxial growth on Cu(001). Index terms - Co, electrodeposition, magnetic thin films, ultrathin films

It was found, among other things, that only 15 states required all preservice educators to be exposed to the characteristics and needs of exceptional children and youth; that 11 states were either considering such a requirement or anticipated instituting one in the near future; and that over half the states had no such certification requirements, nor were they contemplating one. (DLS)

Localized electrochemical deposition of small Co clusters on Au (111) has been achieved by using the tip of a scanning tunneling microscope (STM) as an electrochemical nanoelectrode. In contrast to most of the reported techniques to create nanostructures, this approach avoids irreversible modifications of both substrate and deposit during the preparation process. A special polarization routine of the STM tip allows a purely electrochemical growth of Co clusters with diameters as small as 15 nm. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Presents information on a study which irradiated YBa[sub2]Cu[sub3]O[sub7-∞] single crystals with T[subc]=90.5 K and different transition width with fast neutrons. Decrease in the temperature of the critical temperature of both crystals; Information on the fast neutron irradiation performed; Results of proton irradiation experiments.