Magnetization properties are studied with the help of many different techniques and instruments. The MOKE, the magneto-optical Kerr effect is a technique to study magnetization properties. Researchers make use of the MOKE in the case of analyzing for magnetized surfaces and magnetization structures etc. The MOKE operates on the principle that when light is reflected a highly-magnetized surface, then it would result in ultimate changes in the polarization and the reflected intensity and this can be studied to understand magnetization effects. It is almost similar to the Faraday Effect. However, the Faraday Effect describes the light changes in the context of polarization and the reflection intensity as understood from a magnetic surface. In the case of the Kerr effect that MOKE operation on it is understood to be changes because of light reflected from magnetic surfaces.
“The magneto-optical Kerr effect MOKE has emerged as a powerful experimental technique to study the magnetic properties of thin ﬁlms and multilayers. Compared to other elegant techniques such as superconducting quantum interference device magnetometry, magnetic force microscopy, etc., the advantages of MOKE include high sensitivity down to the monolayer resolution, high temporal and spatial resolution, simplicity, and straightforward in situ implementation all of that at very low costs in comparison with its alternatives. MOKE has been extensively employed to investigate several important phenomena of modern magnetism”
The variables for velocity of light through medium are Vp. The magnetic permeability and the material permittivity are also given here. Speed of light will vary based on the orientation and hence there will be many fluctuations in the context of polarization.
Now the MOKE effect states that the plane of polarization of the light gets rotated when the light reflection is observed from a magnetic material. Physical origin of MOKE lies in this circular effect. There is a form of exchange and spin-orbit coupling observed at this point. This leads to different forms of absorption spectra. Especially in the context of the left circular and the right circular polarized light, it is observed that there are absorption spectra created. The measurement of these changes in polarization leads to the reflected beam, and the angle of this reflected beam are called the Kerr angle. The Kerr angle is what gives access to magnetization state in the sample so that it could be analyzed. The MOKE has been used popularly for the study of quasi-static magnetization reversal property studies and more. It has been used in conjunction with the pulsed laser system and the dependence in magnetization characteristic is assessed thus. It is equally possible to study for effects such as frequency and more.