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Title: In-situ growth and characterization of epitaxial NI films on MGO substrates
Authors: YU JINHUA
Keywords: hcp, fcc, structure transformation, V-M growth mode, uniaxial magnetic anisotropy, activation energy
Issue Date: 19-Oct-2004
Citation: YU JINHUA (2004-10-19). In-situ growth and characterization of epitaxial NI films on MGO substrates. ScholarBank@NUS Repository.
Abstract: Epitaxial metal: insulator interfaces are of growing interest, and their application concerns many different industrial sectors, including thin film growth, electronic and opto-electronic devices. In the present work, Ni was deposited on the (001) MgO surface in an ultra-high vacuum in-situ transmission electron microscope. The films were grown by electron beam evaporation between 25i??C and 600i??C. A novel pseudomorphically strained hcp phase, and an fcc phase was observed in the earliest stages of growth, followed by a structural transformation to an entirely fcc phase of [100] or [110] orientation. In this thesis, we discuss the morphology and the orientations of the fcc phase as a function of film thickness and growth temperature. The activation energy for surface diffusion of Ni on MgO(100) was determined to be ~0.6eV. A novel uniaxial magnetic anisotropy was detected upon in-situ annealing of our films, and the magnetic properties of the film was studied.
Appears in Collections:Master's Theses (Open)

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