An Investigation of magneto-optical Kerr effect signal by optical cavity in Glass/Co/ZnS structure
Behnam Esmaeilzadeh, Mehrdad Moradi, Farhad Jahantigh
Index: 10.1016/j.jmmm.2018.04.003
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Abstract
In this paper, by using the Kerr effect, the magnetic properties of [Glass/Co/ZnS] structure has been investigated. Initially, by co-precipitation method, zinc sulfide was prepared and then by using X-ray diffraction pattern, its structure was confirmed. In the structure of [Glass/Co/ZnS], cobalt was used as a magnetic material and zinc sulfide as a capping layer. Before fabrication, the optimum cobalt and zinc sulfide thicknesses were calculated using the MATLAB simulation software and the desired thicknesses were selected. To obtain layers with variable thicknesses, the oblique thermal evaporation technique was used and different thicknesses of about 5 to 90 nm for cobalt and 45 nm for zinc sulfide on the glass substrate were coated. The longitudinal Kerr signal (LKS) of the layers were measured in different thicknesses. By using the longitudinal magneto-optical Kerr effect, the hysteresis loop of layers in the longitudinal geometry have been measured and it was observed that the sample has an easy axis in the plane of the film and in the direction of its large diameter. The results have shown that the capping layer with suitable thickness, by creation of an optical cavity, has been able to amplify the Kerr signal by more than 1.5 times, which is noticeable by considering the simplicity of the technique. This structure can be applied as a highly accurate magneto-optical sensor.