The Application Of Magneto-optical Effect In Diluted Semiconductors

In recent decades, as the development of magnetic-memory technique of spintronics in emerging high-tech fields, vatious kind of magnetic-optical devices and magnetic-optical measure that use the theory of magnetic-optical effect have displayed these special proerty and broad application prospects, which attracted people's strong interest. According to the difference of polarization of incident light, magnetic-optical effect can be simply divided into two parts:Magnetic-optical Kerr effect(MOKE), which is based on line polarized light, and magnetic circle dichroism, which is based on circle polarized light. While MOKE is sensitive to magnetic moment on the surface of sample, so it is usually acted as an magnetic measurement for surface; and while MCD can reflect the absorption difference of right-handed light and left-handed light. For the energy between lev and 5ev, MCD can reflect the features nearby Fermi surface, which is an important tool to study diluted magnetic semiconductor.In this paper, I will mainly take a case study of the magnetic circular dichroism(MCD) and the surface magneto-optical kerr effect(SMOKE) to introduce the application of magneto-optical effect in Diluted magnetic semiconductors(DMS) and introduce the equipments that I build; I will also introduce the basic theory and the develop process of the magnetic circular dichroism spectroscopy and the kerr effect spectroscopy, while the major work that I have done is setting up the equipments, writing the program, and debuging the MCD and MOKE spectrograph.This paper can be devided into five chapters:In the first chapter, I will mainly introduce the background, which include the sort, theory and application of magnetic-optical effect and spintronics.In the second chapter, I will mainly introduce the application and working principle of magnetic circular dichroism(MCD) spectroscopy, and introduce the MCD spectroscopy which is set up by our group.In the third chapter, I will mainly introduce the basic theory and application of magneto-optical kerr effect(MOKE).In the fourth chapter, I will make use of the data that taken by MCD and MOKE to measure some sample, and explain the data.In the five chapter, I will summary the whole paper.