Regensburg 2025 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 37: Magnetic Imaging Techniques

MA 37.7: Vortrag

Donnerstag, 20. März 2025, 16:30–16:45, H16

Magnetic vector field imaging with single domain magnetooptical indicator films — •Michael Path and Jeffrey McCord — Institute for Materials Science, Kiel University, Germany

Robust and fast magnetic vector field imaging is essential for the characterization of, e.g., electronic systems. We present a magnetooptical method for quantitative and spatially resolved magnetic vector field imaging based on the use of magnetooptical indicator films. Simultaneous magnetooptical temperature extraction ensures temperature independent quantification of the magnetic field amplitude and angle. Yttrium-iron-garnet indicator films with in-plane and out-of-plane magnetic anisotropy can be used for this method. In both cases, a magnetic bias field is applied to bring the indicator film into a single-domain state along four different directions. By measuring the out-of-plane tilt of the magnetization with four images using magnetooptical microscopy, the local magnetic vector field distribution and the local temperature are obtained. As an example, the magnetic vector field distribution generated by the current of an integrated circuit is observed and compared with the calculations. The accuracy of this method is verified by means of relative and statistical error analysis.

Keywords: magnetooptics; magnetooptical microscopy; magnetic field sensor; YIG; temperature sensor