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The figure shows the room temperature MOKE magnetometer set-up in our lab. The light incident from He-Ne laser (L) is linearly polarized by using a polarizer (P). It is then incident on the sample (S) placed in the magnetic field (M). This polarized light on interacting with the sample magnetization becomes elliptically polarized with rotation. The reflected light from the sample is allowed to pass through the analyzer kept at 45˚ w.r.t to the principle axis. The signal is then detected at the photodetector. A magnetic field upto 0.8 T can be applied using the existing electromagnet.
Magneto-Optic Kerr Effect (MOKE) uses the change in polarization or intensity of the incident polarized light after being reflected from the surface of a magnetic sample to derive magnetic properties. It is a popular technique to study magnetic properties of thin films and multilayers because of several advantages including the sensitivity down to monolayer resolution, high temporal and spatial resolution and its low cost.
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