Regensburg 2007 – scientific programme

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MA: Fachverband Magnetismus

MA 32: Magnetic Imaging

MA 32.4: Talk

Friday, March 30, 2007, 11:45–12:00, H22

Quantitative imaging of stray fields and magnetization distributions in hard magnetic element arrays — Sebastian Dreyer¹, •Christian Jooss¹, Jonas Norpoth¹, Sibylle Sievers², and Volker Neu³ — ¹IInstitut für Materialphysik, Friedrich-Hund-Platz 1, 37077 Göttingen — ²Physikalisch-Technische Bundesanstalt,Bundesallee 100, 38116 Braunschweig — ³IFW Dresden, Postfach 270016, 01171 Dresden

In order to determine magnetic stray field and magnetization distributions of thin magnetic patterns and arrays, we developed a new quantitatitive imaging technique based on magneto-optical indicator films (MOIF) combined with inverse magnetostatic methods and magnetic force microscopy (MFM). The method is applied to hard magnetic FePt and PrCo₅ films which exhibit out-of-plane and in-plane easy magnetization axes, respectively. The films are patterned with standard electron beam lithography into square shaped elements with sizes between 10 µ m and 500 nm. The magnetization values obtained from the MOIF method are in excellent agreement with those of SQUID measurements. Field, sensor and force transfer functions for quantitative imaging are derived for both imaging methods, representing a general concept for calibration of a MFM.