Atomic scale investigations of the Co/Pt(111) interface structure and magnetic properties

Moon, D. W.; Ha, Y. H.; Park, Y.; Lee, J.-W.; Kim, J.; Shin, S.-C.
July 2001
Applied Physics Letters;7/23/2001, Vol. 79 Issue 4
Academic Journal
The interface structure of an ultrathin Co overlayer on a Pt(111) crystal was investigated with atomic-layer resolution medium-energy ion scattering spectroscopy and surface magneto-optical Kerr effect (SMOKE). For a 7 ML Co, interdiffusion begins at 673 K to form a heavily distorted Co–Pt surface alloy layer with little change in SMOKE intensity. However, annealing at 773 K formed a 30 atomic-layer-thick Co–Pt substitutional alloy with 3.7% maximum tensile strain, at which the SMOKE intensity increased more than 200%. The enhancement of the Kerr intensity is discussed with the interface alloy formation. © 2001 American Institute of Physics.


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