Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 47: Poster III

MA 47.18: Poster

Thursday, March 21, 2024, 15:00–18:00, Poster D

Simultaneous Magneto-Optical Imaging of Temperature and Magnetic Fields Utilizing YIG Hysteresis Loops — •Michael Path and Jeffrey McCord — Institute for Materials Science, Kiel University, Germany

We present a novel approach for the simultaneous measurement of temperature and magnetic fields. By exploiting the Faraday effect in bismuth-doped yttrium iron garnet, changes in the magnetization state are detected through the rotation of the polarization axis. A Stokes polarization camera in a magneto-topical microscope is used for direct quantification of this rotation. The garnet is modulated with an external field to continuously measure four distinct points on the hysteresis loop. This enables a measurement of the saturation magnetization for temperature, as well as susceptibility and offset, allowing for a self-calibrated measurement of the out-of-plane component of the magnetic field. This method achieves a temporal resolution in the order of milliseconds and a spatial resolution in the micrometer range for temperature and magnetic field. To validate our method, we provide an example with a current-carrying wire.

Keywords: magnetic field sensor; temperature sensor; magneto optics; YIG; magnetic domains