Phase transition and crystal structures of BaZn2Si2O7 Erasable magneto-optical ~MO! recording media are now widely available because of their high recording density, information stability and recording/read-out speed and noncontact writing/read-out mode. However, further exploration of new materials is still needed because the current MO materials, i.e., rare earth ~RE!–transition metal amorphous thin films, are unsatisfactory in terms of chemical stability and MO effects at short wavelength range.1–3 Consequently, considerable attention II. THE POLAR KERR EFFECT The relations between the observed MO quantities and the dielectric tensor elements are discussed briefly here for the analysis of our experimental data. A more extended description can be found in Refs. 18 and 19. For the polar geometry in which the magnetic field applied英语论文网 【http://www.51lunwen.org】
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