Cedric J. Powell

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________________________ The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that(More)
We have investigated the circumstances underlying recent reports of very large values of ballistic magnetoresistance (BMR) in nanocontacts between magnetic wires. We find that the geometries used are subject to artifacts due to motion of the wires that distort the nanocontact thereby changing its electrical resistance. Since these nanocontacts are often of(More)
We have investigated the effectiveness of Al, Au, Cu, Ni, Fe, and Ta films with thicknesses up to 4 nm for protecting a Co surface from oxidation in air at room temperature. The distinct change in the Co 2p 3/2 core-level line shape observed by x-ray photoelectron spectroscopy upon the oxidation of Co makes it a simple matter to identify the fractions of(More)
The current generation of hard-disk drives use giant magnetoresistance (GMR) spin valves as the read-head because the GMR e€ect is currently the most sensitive way to detect magnetic ®elds at submicron length scales and data rates of 10 8 Hz. At present, hard-disk capacities are doubling approximately every year. To maintain this growth rate, GMR values(More)
ii The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors(More)
OPSOMMING Navorsing is gedoen om die stand van indiensopleiding vir verpleegkundiges in die Witwatersrand-gebied te beskryf. Deur 'n literatuurstudie en onderhoude is agt kriteria vir geslaagde indiensopleiding geidentifiseer. Die navorsing is uitge-voer met behulp van 'n vraelys wat op grond van die agt kriteria saamgestel is. Verskeie probleemareas in(More)
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