Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.95: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU C

Quantitative imaging of magnetization distributions of nanostructured ferromagnetic films — •Sebastian Dreyer¹, Christian Jooß¹, Sibylle Sievers², Martin Albrecht² und Uwe Siegner² — ¹Institut für Materialphysik, Universität Göttingen, D-37077 Göttingen — ²Physikalisch-Technische Bundesanstalt, D-38116 Braunschweig

An important issue of nanomagnetism is a full quantitative mapping of magnetization distributions also with a great importance for high-density magnetic recording applications. We report on the development of a quantitative spatially resolved measurement technique with a spatial resolution of ∼ 500nm and its application to the mapping of magnetization distributions of patterned ferromagnetic films. This quantitative magnetic imaging is based on magneto-optics, using the Faraday effect in advanced sensor films, for nanostructures with a size down to ∼ 700nm and smaller sizes in combination with MFM measurements. The stray field imaging was performed on Permalloy, Co and CoPt nanostructures in the thickness range of 2µm down to 10nm.

Co as example for inplane magnetized structures and CoPt nanostructures with a perpendicular anisotropy serve as test systems for the two limits of pure in- and pure out-of-plane magnetization. Results of an advanced inversion method, based on the Fourier transform ansatz, for the determination of magnetization distributions from the measured stray field are presented for these systems.