Dresden 2011 – scientific programme
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KR: Fachgruppe Kristallographie
KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)
KR 5.29: Poster
Tuesday, March 15, 2011, 10:45–13:00, P2
Influence of the geometrical parameters on the angular dependence of HC in elliptical microstructures — •Thomas Sebastian, Andrés Conca, Georg Wolf, Thomas Meyer, Britta Leven, and Burkard Hillebrands — FB Physik und Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany
Elliptical magnetic microstructures 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. A systematic study of the influence of the shape anisotropy on the coercive field HC provides important information for the ability to control the anisotropic switching properties of single elements.
Here, we present measurements on the angular dependence of HC for elliptical elements with varying size and aspect ratio (AR). The size of the structures ranges from 6 µm to 3 µm with ARs varying from 2 to 5. The measurements were performed with a µMOKE setup equipped with a micro-focused HeNe-laser beam with a spotsize of 1 µm. The elements were structured from 5 nm thick polycrystalline films of NiFe, CoFe and CoFeB using e-beam lithography. A comparison of the influence of the shape anisotropy on the angular dependence of HC for the three materials and for the different dimensions will be discussed.
Support by the BMBF project MultiMag (VDI-TZ 13N9913), the state of Rhineland-Palatinate and the industrial partner Sensitec GmbH, Mainz is acknowledged. We would like to thank the Nano+Bio Center of the TU Kaiserslautern for sample preparation.