Tunable magnetic anisotropy of ultrathin Co layers

Park, S.; Zhang, X.; Misra, A.; Thompson, J. D.; Fitzsimmons, M. R.; Lee, S.; Falco, C. M.
January 2005
Applied Physics Letters;1/24/2005, Vol. 86 Issue 4, p042504
Academic Journal
We prepared multilayers, consisting of an epitaxial Au/Co/Au/Cu(111) architecture on Si(111) substrates, to understand the magnetic anisotropy of an ultrathin Co layer in relation to its structure. The room-temperature magnetization of an 8-monolayer (ML)-thick Co layer is predominately either in-plane or out-of-plane depending upon the thickness of the Au underlayer. Specifically, for a Co film grown on a 2-ML-thick Au, the Co film has a distorted fcc structure and in-plane magnetic anisotropy. For a Co film grown on a 6-ML-thick Au, the Co film has a distorted hcp structure and out-of-plane magnetic anisotropy.


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