Regensburg 2013 – scientific programme
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MA: Fachverband Magnetismus
MA 16: Poster I
MA 16.78: Poster
Tuesday, March 12, 2013, 10:30–13:30, Poster D
Laterally resolved thermal imaging using magneto-optical indicator films — •Mikhail Kustov1, Natalya Mamkina2, Rostislav Grechishkin2, and Jeffrey McCord1 — 1Nanoscale Magnetic Materials, Magnetic Domains, Institute for Materials Science, University of Kiel, 24143 Kiel, Germany — 2Laboratory of Magnetoelectronics, Tver State University, 170000 Tver, Russia
A novel approach for imaging of lateral temperature distributions is demonstrated. The method involves an optical polarization microscope and a magneto-optical indicator film (MOIF), which is placed in contact with the investigated sample in the same way as for the imaging of magnetic stray fields [1]. Since the Faraday rotation is a function of the local saturation magnetization of the MOIF sensing layer and the saturation magnetization is a function of temperature, the MOIF can be exploited as a transducer of a local variation of temperature into a variation of magneto-optical contrast. In order to obtain maximum sensitivity the Curie temperature of the sensing layer is chosen to be close, but still above the temperature range of investigation. MOIFs with both planar and uniaxial magnetic anisotropy can be used.
Relying on optics, the imaging scheme has the potential to work up to high temporal resolution, only depending on thermal conductions. Temperature changes occurring within a few microseconds can be measured with lateral resolution. Temperature resolution of the order of 0.01K (for integral measurements) is demonstrated.
[1] R. Grechishkin et al., in: B. Azzerboni et al. (eds.), Magnetic Nanostructures in Modern Technology, pp.195-224.