Abstract
The presence of perpendicular anisotropy in Co/Pt multilayers is often attributed to an enhanced orbital magnetization at the surface or interfaces of the multilayers. By the application of the 〈Lz/Sz〉 sum rule to magnetic x-ray circular dichroism spectra it is possible to probe directly the orbital to spin ratio. In this study a comparison has been made of this ratio between Co/Pt multilayers with different anisotropies and also with single films of Co with and without Pt. The multilayers were prepared in high vacuum by evaporation on Si substrates with a 2.4 nm Pt buffer and a 1.2 nm Pt capping layers, characterized by x-ray diffraction and magneto-optic Kerr effect. The magnetic circular dichroism experiments were carried out at Daresbury laboratory in 75% polarization in ±1 T perpendicular applied fields as a function of temperature from 25 to 300 K. We find that the 〈Lz/Sz〉 ratio is enhanced for a multilayer with perpendicular anisotropy compared to a similar multilayer with in-plane anisotropy.
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