Interface magnetic and optical anisotropy of ultrathin Co films grown on a vicinal Si substrate

A. Stupakiewicz, A. Kirilyuk, A. Fleurence, R. Gieniusz, T. Maroutian, P. Beauvillain, A. Maziewski, Th. Rasing
2009 Physical Review B  
Vicinal substrates provide unique opportunities to engineer the magnetic anisotropies of magnetic ultrathin films. Here we study Co layers on step-bunched Si(111) substrates, with or without a Cu interlayer, taken as model samples. To correlate their interface morphology with the step-induced magnetocrystalline anisotropy and the second-order optical polarization, the magnetization reversal, ferromagnetic resonance, and the interface-induced nonlinear magneto-optical spectroscopic response was
more » ... nvestigated. We show that both the magnetic anisotropy of the Co layer and the nonlinear magneto-optical response are strongly modified by the addition of the Cu buffer. Thus, the Cu layer reduces the influence of step bunches on the in-plane anisotropy while simultaneously changing the uniaxial anisotropy constant. This is accompanied by a relative change in the rotational harmonics of the nonlinear optical signals that reflect the changes in the interface structure.
doi:10.1103/physrevb.80.094423 fatcat:ugqhs5nyp5dltcc2udvxq6wkc4