Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 53: Spin Structures at Surfaces and in thin films II
MA 53.1: Vortrag
Freitag, 4. April 2014, 09:30–09:45, BEY 118
Co nanodot arrays grown on a ferromagnetic GdAu2 template: substrate/nanodot antiferromagnetic exchange coupling — •Laura Fernandez1, Maria Blanco Rey1,2, Maxim Ilyn3, Lucia Vitali4, Alex Correa1, Philippe Ohresser5, Enrique Ortega1,2,3,4, Andrés Ayuela1,3, and Frederik Schiller1,3 — 1Donostia International Physics Center, San Sebastian, Spain — 2Universidad del Pais Vasco (UPV/EHU), San Sebastian, Spain — 3Centro de Física de Materiales, San Sebastian, Spain — 4Ikerbasque, Bilbao, Spain — 5Soleil, Saint-Aubin, France
Controlling and manipulating exchange coupling and anisotropy in patterned magnetic nanostructures is the key for developing advanced magnetic storage and spintronic devices. Here we search the magnetic interaction between a Co nanodot array and its supporting ferromagnetic GdAu2 nanotemplate. X-ray magnetic circular dichroism measurements reveal strong antiferromagnetic coupling across the Co/GdAu2 interface, which is corroborated by full-potential linearized augmented plane wave calculations. These studies find that the anisotropy of the Co nanodots is profoundly modified by the influence of the GdAu2 nanotemplate that induces large anisotropy values. In clear contrast with non-magnetic Au substrates, GdAu2 triggers the early switch in the anisotropy direction from out-of-plane in monolayer-thick Co, to in-plane, in bilayer Co films.