Focused ion beam was utilized to locally modify magnetism and structure of L10 FePt perpendicularthin films. As a first step, we have performed a magnetic, morphological, and structural study ofcompletely irradiated FePt films with different Ga+ doses 11013 –41016 ions/cm2 and ionbeam energy of 30 keV. For doses of 11014 ions/cm2 and above a complete transition from theordered L10 to the disordered A1 phase was found to occur, resulting in a drop of magneticanisotropy and in the consequent moment reorientation from out-of-plane to in-plane. The lowesteffective dose in disordering the structure 11014 ions/cm2 was found not to affect the filmmorphology. Taking advantage of these results, continuous two-dimensional 2D patterns ofperpendicular magnetic structures 250 nm dots, 1 m dots, 1 m-large stripes were produced byfocused ion beam without affecting the morphology. The 2D patterns were revealed by means ofmagnetic force microscopy, that evidenced peculiar domain structures in the case of 1 m dots.© 2008 American Institute of Physics.
Local modifications of magnetism and structure in FePt (001) epitaxial thin films by focused ion beam: two-dimensional perpendicular patterns / F., Albertini; L., Nasi; F., Casoli; S., Fabbrici; P., Luches; G. C., Gazzadi; A., di Bona; P., Vavassori; Valeri, Sergio; Contri, Sara Federica. - In: JOURNAL OF APPLIED PHYSICS. - ISSN 0021-8979. - STAMPA. - 104:(2008), p. 053907. [10.1063/1.2975217]
Local modifications of magnetism and structure in FePt (001) epitaxial thin films by focused ion beam: two-dimensional perpendicular patterns
VALERI, Sergio;CONTRI, Sara Federica
2008
Abstract
Focused ion beam was utilized to locally modify magnetism and structure of L10 FePt perpendicularthin films. As a first step, we have performed a magnetic, morphological, and structural study ofcompletely irradiated FePt films with different Ga+ doses 11013 –41016 ions/cm2 and ionbeam energy of 30 keV. For doses of 11014 ions/cm2 and above a complete transition from theordered L10 to the disordered A1 phase was found to occur, resulting in a drop of magneticanisotropy and in the consequent moment reorientation from out-of-plane to in-plane. The lowesteffective dose in disordering the structure 11014 ions/cm2 was found not to affect the filmmorphology. Taking advantage of these results, continuous two-dimensional 2D patterns ofperpendicular magnetic structures 250 nm dots, 1 m dots, 1 m-large stripes were produced byfocused ion beam without affecting the morphology. The 2D patterns were revealed by means ofmagnetic force microscopy, that evidenced peculiar domain structures in the case of 1 m dots.© 2008 American Institute of Physics.Pubblicazioni consigliate
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