誘電体膜被覆によるたてカー効果のエンハンスメント

概要

論文の詳細を見る
Enhancement of longitudinal Kerr magneto-optic effect was investigated by means of dielectric thin films coated on ferromagnetic surfaces. The Kerr effect allows the magnetic domain structures of ferromagnetic materials to be observed and reflection-type magneto-optic memory information to be read out optically. However, the Kerr rotation angle in ferromagnetic materials is less than one minute and therefore to obtain a high SN ratio the enhancement is needed. Enhancement conditions of the Kerr rotation angle were presented considering to the nonmagnetic components in a reflection medium consisting of a dielectric film on a ferromagnetic surface. The method of determining the Kerr rotation angle was based upon current component analysis of electric signals in a photo-multiplier detector. The Kerr rotation angles were measured in Permalloy (82.9 wt.% Ni-Fe) films coated with SiO films. Experimental SiO film thickness and the incidence angle of deflected light for a maximum Kerr rotation angle agreed well with the values calculated by the approximate zero nonmagnetic reflection condition.
東海大学の論文
1995-03-30