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O: Fachverband Oberflächenphysik

O 20: Invited Talk Cyrus Hirjibehedin (FV: MA+O): Spin-Coupling in Engineered Atomic Structures

O 20.1: Hauptvortrag

Dienstag, 27. März 2007, 09:30–10:15, H36

Spin-Coupling in Engineered Atomic Structures — •Cyrus Hirjibehedin, Christopher Lutz, and Andreas Heinrich — IBM Research Division, Almaden Research Center, San Jose, CA 95120 USA

Magnetic nanostructures are increasing data storage capacities and are promising candidates for implementations of novel spin-based computation techniques. The relative simplicity and reduced dimensionality of nanoscale magnetic structures also make them attractive model systems for studying the interactions between small numbers of quantum spins. Using a high-field low-temperature scanning tunneling microscope, we assemble linear chains of Mn atoms one atom at a time on thin, insulating layers of copper nitride. We probe the excitation spectra of the individual magnetically-coupled chains with inelastic electron tunneling spectroscopy and observe excitations of the coupled atomic spins that can change both the total spin and its orientation. Comparison with a model spin-interaction Hamiltonian yielded the collective spin configuration and the strength of the coupling between the atomic spins.