Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 91: [MA] Poster II
O 91.31: Poster
Friday, March 30, 2012, 11:00–14:00, Poster A
Influence of the dipolar interaction on the quasi-static magnetic properties of elliptical microstructures in dense packed arrays — •Andres Conca, Thomas Sebastian, Georg Wolf, Britta Leven, and Burkard Hillebrands — FB Physik und Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany
Elliptical magnetic structures with dimensions of a few micrometers play a crucial role in the design of magnetic field sensors and in data storage applications such as MRAM cells. The magnetic properties of such structures are mostly controlled via the shape anisotropy. In many cases, a high packing density is required. However the effect of dipolar interaction between the individual elements within the array due to stray fields can be very strong when the distances are of only a few micrometers.
We present measurements of the influence of the packing density on the coercive field HC of elliptical elements in arrays. For this purpose, 5×5 arrays of elliptical elements were prepared with varying inter-element distances. The arrays were structured using e-beam lithography from a 5 nm thick polycrystalline CoFeB thin film deposited on a Si substrate. The measurements were performed with a µMOKE setup equipped with a micro-focused HeNe-laser beam with a spotsize of 1 µm.