Longitudinal Magneto-optic Kerr Effect (MOKE)

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.