New multilayers for high density magneto-optical storage

摘要

We describe here the magnetic and magneto-optical properties of new (Co_xNi_(1-x))/Pt multilayer materials. These show uniaxial anisotropy and interesting polar Kerr rotation. Besides the Co-Ni alloy allows us to adjust the Curie temperature without trading off other properties, make these potential candidates for rewritable magneto-optic storage media. For x=0.3, sample with the magnetic layer 4.5A thick shows a coercivity of 1.4kOe and presents a peak in the Kerr rotation of 0.3 deg near 4 eV. The Curie temperature is close to 200℃. The results are discussed.