MAGNETIC AND MAGNETOOPTIC STUDY OF A LAYERED CO PT - DYSPROSIUM-IRON-GARNET SYSTEM/

We have studied the effects of placing Co/Pt multilayers on dysprosium -iron-garnet doped-with bismuth and aluminum. The garnet was deposited by RF-magnetron sputtering and crystallized by rapid thermal annealin g. The Co/Pt multilayers were then deposited by DC-magnetron sputterin g. The garnet thickness was held constant at 1000 Angstrom while the C o/Pt multilayer had the form of [3 Angstrom Co/9 Angstrom Pt](n) with n ranging from 1 to 16. Coercivities of the samples ranged from about 300 to 2000 Oe. Kerr rotations were as high as 1.8 degrees and ellipti cities up to 2 degrees depending upon the wavelength of light and the number of Co/Pt bilayers. Magneto-optic signal figures of merit are de termined for several of these composite systems.