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Anisotropy, hysteresis, and morphology of self-patterned epitaxial Fe/MgO/GaAs films

AuthorsCebollada, F.; Hernando-Mañeru, A.; Hernando, A.; Martínez Boubeta, Carlos ; Cebollada, Alfonso ; González, J. M.
Issue Date7-Nov-2002
PublisherAmerican Physical Society
CitationPhysical Review B 66, 174410 (2002)
AbstractThe dependence of the effective anisotropy and of the magnetization reversal processes on the deposition temperature of a series of epitaxial Fe/MgO/GaAs films, grown by a combination of laser ablation and sputtering, has been discussed and correlated to their local morphology and crystallinity. The transverse susceptibility measurements have evidenced the presence of a fourfold effective anisotropy for all films, irrespective of their deposition temperature and local morphology, with a constant value very close to that of single-crystalline iron. The magnetization processes evolve with increasing deposition temperature from a nucleation-expansion-propagation mechanism, taking place in smooth continuous films, to pinning, occurring in self-patterned films with homogeneous distributions of defects, and then to fully isotropic reversal, for tiled films composed of rectangular elements.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.66.174410
Appears in Collections:(IMN-CNM) Artículos
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