Study On Wide-spectrum Ultrafast Kerr-Magnetic Properties Of Two-Dimensional Electronic Material MoS₂

With the rapid development of optical fiber communication,optical information processing and magneto-optical recording technology,the need for magneto-optical kerr effect based electronic spin devices and quantum devicesmagneto-optical materials,devices and measurement technology have become the focus of international attention.At present,the two-dimensional electronic material MoS₂ has intrinsic band gap,strong interaction between light and matter,and spin valley characteristics,it is beyond compare with other materials,and has become the representative of two-dimensional electronic materials.It has received much attention in the international community,so the magnetic field of two-dimensional electronic materials represented by MoS₂ has been developed optical properties,both in the field of science and industrial production has a very wide range of applications.Based on magneto-optical kerr effect and ultrafast pump-probe technique,a femtosecond laser-induced supercontinuum white light is used as light source.A wide-spectrum MOKE?magneto-optic kerr effect?and ultrafast time-resolved TR-MOKE?magneto-optic kerr effect?system were built.The magnetic properties of two-dimensional MOS₂ and ultrafast magnetodynamics were studied.The study of mechanical behavior.Based on the basic theory of magneto-optical kerr effect,the magneto-optical properties of MoS₂ two-dimensional electronic materials are analyzed.Based on MOKE and TR-MOKE systems,the magneto-optical properties of Lanthanide rare earth manganese oxide LSMO(La_0.67Sr_0.33MnO₃)ferromagnetic films were studied at room temperature.The stability and validity of the system are proved.On basis,at low temperature magnetic field,the studied of the ultrafast magneto-optical properties of two-dimensional MoS₂,and the dependence of kerr rotation angle on wavelength and external magnetic feld are obtained.Relationship.When the pump wavelength is close to the exciton resonance wavelength,the valley polarization effect causes the absorption of left/right circularly polarized light to be significantly enhanced.As a result,the number of spin-up/spin-down electronic.The sample was transiently magnetized and exhibited ultrafast magnetism.The results of this study have important implications for the development of novel low-dimensional ultra-fast spintronic devices.