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MA: Magnetismus

MA 9: Magnetic Imaging

MA 9.2: Vortrag

Montag, 27. März 2006, 15:15–15:30, HSZ 401

Quantitative imaging of magnetization distributions of micro- and nanostructured ferromagnetic films — •Sebastian Dreyer¹, Christian Jooss¹, Sibylle Sievers², Martin Albrecht², Uwe Siegner², and Volker Neu³ — ¹Institut f. Materialphysik, Universität Göttingen, D-37077 — ²Physikalisch-Technische Bundesanstalt, D-38116 Braunschweig — ³IFW Dresden, D-01171 Dresden

An important issue of nanomagnetism is a full quantitative mapping of magnetization distributions also with a great importance for high-density recording applications. We report on the development of a quantitative spatially resolved measurement technique 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, with a spatial resolution of about 300nm, which is refined by MFM measurements down to a spatial resolution of 20nm. The stray field imaging was performed on PrCo, SmCo and CoPt structures in the thickness range of 200nm to 50nm. PrCo and SmCo serve as test systems for purely inplane magnetized structures, the CoPt for pure out-of-plane and more complicated mixed magnetization distributions. 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 and compared with theoretical values.