抄録
The magneto-optical properties and related magnetic properties were studied for a series of polycrystalline Fe-Ni Invar films prepared by a vacuum evaporation method. The Kerr rotation angle (θK) was measured through a glass substrate by the polar Kerr magneto-optic effect using a He-Ne laser (6328 Å). The Kerr rotation angle of Fe71Ni29 increases from 0.032° to 0.165° with decreasing film thickness from 360 Å to 200 Å. However, there is little decrease of θK at the top surface boundary of the film. Therefore, the increase of θK is believed to be caused by the increase of magnetic moment at the bottom boundary. It is concluded that the interaction between film and substrate is a very important factor in the thickness dependence of the magnetic moment of Invar alloy film (∂MS/∂D < 0).
