Masenda, Hilary2014-07-222014-07-222014-07-22http://hdl.handle.net/10539/14962A thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the academic requirements for the degree of Doctor of Philosophy. Johannesburg, 2014.Unable to load abstract.enMagnetics.Semiconductors.Gallium nitride.Zinc oxide.Iron.Cobalt.Thesis