The MOKE is a popular technique because of how it is non-invasive. This non-invasive nature of Moke makes it more substantial for use in sample assessments. It is carried out under the influence of a pulsed magnetic field and sometimes a microwave field and both are critically non-invasive except for some material interactions. In the context of static or thin magnetic films, there is a need for noninvasive techniques and the MOKE comes handy here. Spatial resolutions are good with the MOKE and the spatial resolutions are only limited by the optical resolution that is used at this point.
In the context of understanding stating and dynamic properties of thin magnetized films, one more aspect to be understood is that the lower the lateral dimension the less the resolution that can be applied for understanding sample. While these elements are seen to increase the potential in the use of MOKE, there are also some concerns noted in the context of MOKE. Firstly, MOKE restricts resolution and capability only so far as the optical resolution and this increases efficiency in assessment. Yet, the static and dynamic natures of the thin magnetic films can hence be studied in a much more effective manner.
Four different forms of MOKE are being used in experiments usually. All MOKE forms usually have some commonalities. Some of the common elements are the light laser that is used, the polarized beams, the angle, the thin film polarizer etc. The beam is usually exhibited such that it is focused directly onto the sample. Once this is done, the light is polarized and in the polarization, the effects of the reflected light are studied. It is important to understand at this point that the beam being focused on the sample is what helps in achieving all this. The beam sent into the sample results in the reflection. The reflection is captured for analysis by a detector unit specifically developed for the purpose. It will show the characteristic elements of the magnetic sample. A detector unit is made use of here at this point.
The detector unit can be custom made such that what need to be studied from the magnetic samples can be studied in isolation. However, a very simple type of detector unit and polarization unit that is used is a prism divided beam into polarized beams and monitored in-film polarizer. A pair of photodiodes exists for the purpose of monitoring. The detector works as an opto electrical bridge and hence would play a role in increasing signal to noise and decreasing it. Normalized differential signal calculated for the given circuit is (I1−I2)/(I1+I2). This value is identified to be directly proportional to the Kerr angle.