Magneto-optical spectroscopy lab

One of the main technqiues that we use in Sheffield to investgate magnetic semiconductors is magneto-optical spectroscopy. The diagram below shows a schematic diagram of our apparatus.

Apparatus

Magneto-Optical Apparatus

The arrangement allows us to measure the magnetic circular dichroism and Faraday rotation in both Kerr (reflection) and Faraday (transmission) geometries. The sample is mounted in a helium flow cryostat between the poles of an electromagnet. A photo-elastic modulator (PEM) is used to obtain high sensitivity according to the method of K. Sato, Jpn. J. Appl. Phys., 20, 2403 (1981).

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