包含双负材料的磁性多层结构中磁光Kerr效应.pdf

Enhanced Magneto-optical Kerr effect in magnetic multilayers containing double-negative metamaterials Yunxia Dong and Xiangdong Zhang Department of Physics, Beijing Normal University, Beijing 100875, China ABSTRACT The magneto-optical Kerr effects in magnetic multilayered structures containing double-negative metamaterials are investigated by using 4 ×4 transfer-matrix method. The azimuth rotations and the figure of merit of the magneto-optical effects are calculated as a function of the thickness of the layers and the frequency of the incident wave. It is shown that the magneto-optical effects are not only enhanced largely for the present system in comparison with those in the magnetic multilayered structures containing general metal materials, a giant Kerr rotation near 90 is also observed when the thickness of the sample is far less than the resonant wavelength. The physical origination for such a phenomenon is also analyzed. This means that we can obtain large magneto-optical Kerr effects at very thin magnetic film by using the double-negative metamaterials, which benefit the application in magnetic-optical recording. PACS numbers: 78.20.Ci, 78.20.Ls, 42.70.Qs 1 I. INTRODUCTION During the past decades, there has been great interest in studying the magneto-optical (MO) effects because of their potential applications for optical readout of magnetically stored information in e