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Magnetisation Pattern of Ferromagnetic Nano-Discs

Raabe, Jörg ; Pulwey, Ralph ; Sattler, R. ; Schweinböck, T. ; Zweck, Josef ; Weiss, Dieter


We explore the magnetization pattern of Co and permalloy disks with diameters between 80 nm and 1 µm by using two complementary experimental techniques: Lorentz microscopy and magnetic force microscopy (MFM). By means of Lorentz microscopy we show that the dominating magnetization pattern of the disks is a vortex structure with closed flux lines in the plane of the disks. Complementary ...


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