Interplay between interfacial and structural properties on the magnetism of self-organized core-shell Co/Pt supported nanodots - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2011

Interplay between interfacial and structural properties on the magnetism of self-organized core-shell Co/Pt supported nanodots

Résumé

We have studied the influence of Pt capping on the magnetic properties of self-organized Co nanodots by means of complementary structural and magnetic investigation techniques. The growth of monodisperse 5 nm diameter Co dots on a Au(111) surface and its progressive coverage by Pt were performed under ultrahigh vacuum conditions and imaged by scanning tunneling microscopy, revealing a weak mixing at room temperature. The Co/Pt core-shell structure was studied both by molecular-dynamics simulations and surface extended x-ray-absorption fine structure, showing a global dilatation of the Co core. Both magnetic moments and hysteresis cycles at various temperatures were measured using x-ray magnetic circular dichroism, revealing a slight increase of the magnetic moments and the out-of-plane magnetic anisotropy after Pt capping. Moreover, the variation of magnetic anisotropy as a function of capping was followed in situ by the magneto-optical Kerr effect. Our investigations demonstrate that interfacial hybridization between Co and Pt is dominant over magnetoelastic contribution in this system.
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hal-01987566 , version 1 (17-09-2022)

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  • HAL Id : hal-01987566 , version 1

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P. Campiglio, N. Moreau, V. Repain, C. Chacon, Y. Girard, et al.. Interplay between interfacial and structural properties on the magnetism of self-organized core-shell Co/Pt supported nanodots. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2011, 84 (23). ⟨hal-01987566⟩
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