Abstract
Pd/(Pt/Co/Pt) modulated multilayer films have been prepared at substrate temperatures ranging from room temperature to 350 °C by e-beam evaporation using various buffer layers. All these films exhibit perpendicular magnetic anisotropy with square polar Kerr hysteresis loops at room temperature. However, we observed a magnetic reorientation from a perpendicular anisotropy to an in-plane anisotropy at temperatures close to the Curie temperature TC. The reorientation temperature TR is found to depend strongly on the nonmagnetic Pd-spacer thickness in these Pd/(Pt/Co/Pt) multilayers. Over the room temperature to TR range, we observe a linear temperature dependence of magnetic coercivity. AFM and STM characterization of the role of buffer layers on the microstructure, the dependence of coercivity and squareness of the Kerr hysteresis loops on the buffer layers of Au, Pt, and Al are also presented.
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