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Publication Citation: Structure and Magnetic Properties of Electrodeposition Co on n-GaAs (001)

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Author(s): A X. Ford; John E. Bonevich; Robert D. McMichael; Mark D. Vaudin; Thomas P. Moffat;
Title: Structure and Magnetic Properties of Electrodeposition Co on n-GaAs (001)
Published: September 19, 2003
Abstract: Co thin films have been electrodeposited on n-type (001) GaAs. The structure and texture of the films were investigated using x-ray diffraction (XRD) and transmission electron microscopy (TEM) while the magnetic properties were examined using a vibrating sample magnetometer (VSM). Structural evolution was found to be a function of the growth rate. A strong hcp-Co (1120) {0001}// GaAs (001)[110] texture was observed for films grown at lower deposition rates. The magnetocrystalline anisotropy of the hcp-Co lattice summed over the two in-plane variants results in four-fold anisotropic in-plane magnetization. Films grown at faster rates have decreased magnetic anuisotropy due to increased structural dispersion. TEM analysis of several films (8.5 nm to 15 nm) revealed a thin bcc-Co layer between the GaAs(001) and the hcp-Co (1120) overlayer. The bcc layer formed with a cube-on-cube relationship to the GaAs (001) substrate. The structural evolution is similar to that reported for films grwon by other methods, such as molecular beam epitaxy (MBE), although the thicknesses at which the various magnetic transitions occur differ significantly, most likely due to the different growth rates employed.
Citation: Journal of the Electrochemical Society
Volume: 150
Issue: # 11
Pages: pp. C753 - C759
Keywords: cobalt,electrodeposition,GaAs,magnetic properties,transmission microscopy,x-ray diffraction
Research Areas: Nanomaterials