Abstract
[Co(3 Å)/Pt(t <sub>Pt</sub> )] <sub>30</sub> (1 1 1) multilayers were prepared by molecular beam epitaxy. X-ray diffractions show clear satellite peaks around the Co/Pt fundamental peak, indicative of a good modulated structure for all Co/Pt multilayers. The optimal perpendicular magnetic properties were obtained for 6 Å < t <sub>Pt</sub> < 10 Å. The effect of Pt buffer (B <sub>Pt</sub> ) upon the magnetic property of [Co(3 Å)/Pt(10 Å)] <sub>30</sub> /Pt(B <sub>Pt</sub> ) is also studied. X-ray diffractions reveal that the superlattice peaks of [Co(3 Å)/Pt(10 Å)] <sub>30</sub> /Pt(B <sub>Pt</sub> ) increase with increasing B <sub>Pt</sub> . The Kerr rotations and polar coercivity H <sub>c</sub> increase with increase in B <sub>Pt</sub> but both saturate at about B <sub>Pt</sub> = 200 Å. © 2002 Elsevier Science B.V. All rights reserved.