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MA: Fachverband Magnetismus

MA 36: Magnetic Particles and Clusters II

MA 36.6: Vortrag

Donnerstag, 26. März 2009, 16:30–16:45, HSZ 401

Effect of Pt capping on the magnetic anisotropy of 3d clusters — •Sanjubala Sahoo¹, Peter Entel¹, and Manuel Richter² — ¹Physics Department, University of Duisburg-Essen, 47048 Duisburg, Germany — ²IFW Dresden e.V., D-01171 Dresden, Germany

Clusters show large magnetic anisotropy compared to bulk because of spatial confinement. The enhanced anisotropy in clusters is a favorable property explored by the data storage technologies, which aim to develop miniature devices. Systems like FePt alloys are active candidates for the same. We study the magnetic anisotropy of 13 atom icosahedral clusters of Fe, Co and Ni, respectively, using the density functional theory. In our studies, the anisotropy is treated by including the spin-orbit interaction in a scalar relativistic approximation in the density functional Hamiltonian. Our studies show that the spin and orbital moments of clusters are larger than that of bulk. The magnetic anisotropy is also enhanced as compared to the corresponding bulk values. The role of Pt in the magnetic anisotropy of clusters is studied by capping Fe cluster with Pt atoms. Capping such a 5d element on a 3d cluster is observed to change the cluster’s anisotropy energy, which will be discussed in our contribution.