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Magnetization reversal asymmetry in Fe/MgO (001) thin films

AuthorsCosta Krämer, José Luis ; Menéndez, José Luis ; Cebollada, Alfonso ; Briones Fernández-Pola, Fernando ; García, D.; Hernando, A.
KeywordsThin films
Issue DateFeb-2000
CitationJournal of Magnetism and Magnetic Materials 210(1-3): 341-348 (2000)
AbstractWe study the in-plane magnetization process in 200 Å Fe(0 0 1) thin films grown by sputtering at normal incidence. In spite of this growth geometry, a small uniaxial in plane magnetic anisotropy, whose origin is not totally understood, is found superimposed to the expected cubic biaxial one. This has a dramatic effect both on the reversal process and the domain structure. A combined longitudinal and transversal Kerr study shows the different switching processes (180° walls along the main easy axis versus 90° along the secondary easy axis) depending on the relative orientation of the magnetic field with respect to the Fe crystallographic axes. Remarkably, this two- and sometimes three-step switching process appears only when the field is applied along certain crystallographic directions. These findings are corroborated by domain observations.
Publisher version (URL)http://dx.doi.org/10.1016/S0304-8853(99)00698-8
Appears in Collections:(IMN-CNM) Artículos
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