Spatial Light Distribution in Magneto Opical System for High Numerical Aperture and Solid Immersion Lens Focusing: Influence on Thermal and MO Effects (Invited Paper)

概要

論文の詳細を見る
In order to achieve higher areal density for optical recording, multilayered magneto optical structures, working at shorter wavelength and higher numerical aperture than the DVD are being developed over the world. MSR (Magnetic Super Resolution) and MAMMOS (Magnetic Amplifying Magneto Optical System) structures use magnetic couplings between magnetic layers and need a very fine temperature control of the recording, switching and reading layers. It has been shown that the power margin for MAMMOS reading is very small^<1)>. At numerical apertures of NA=0.85 with far field optics and even at higher apertures with the Solid Immersion Lens (SIL), it is essential to determine the spatial distribution of the electric field at the focal point of the objective as well as in the different recording layers. We will present a vector simulation of the electromagnetic field in a MO structure illuminated by a high NA focused field, and discuss absorption in the thin films. The MO properties in the different layers are also calculated at variable incidence angles. We illustrate this with SIL coupling calculations.
社団法人日本磁気学会の論文
2002-10-01