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Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 65: Poster 2

MA 65.11: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG1

Quantitative Imaging of Magnetic Nanostructures Using Magneto Optical Indicator Film Techniques — •Manuela Gerken1, Sascha Gorny1, Sandra Lindner2, Sibylle Sievers1, and Hans Werner Schumacher11Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig — 2Matesy GmbH, Otto-Schott-Straße 13, 07745 Jena

The magneto-optical indicator film (MOIF) technique is a versatile tool for imaging magnetic domain structures. Optimized sensor films combined with correction schemes to compensate the influence of the finite sensor thickness allow to measure perpendicular stray field components with a spatial resolution down to the sub μm scale. However, present calibration schemes neglect in-plane stray field components. Therefore, a quantitative analysis of stray field data above micropatterned magnetic materials creates additional difficulties, since the closure of the flux lines leads to a rapidly spatially varying direction of the magnetic field H(x). To understand the sensor response on such arbitrary stray fields the full anisotropy tensor and the magnetic history of the sensor material have to be known. We will present results on the FMR based analysis of sensor materials and a thereon based sensor calibration scheme for vectorial stray fields. But, even if the sensor response function is understood, the inversion from contrast to stray field in gereral is not unique. Conditions which allow a reconstruction of the magnetic field and the underlying domain pattern will be discussed.

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