Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 29: Micro- and Nanostructured Magnetic Materials II
MA 29.6: Vortrag
Mittwoch, 16. März 2011, 12:15–12:30, HSZ 103
Electric field as a switching tool for magnetic states in atomic-scale nanostructures — •Nikolay Negulyaev1, Valeri Stepanyuk1, Wolfram Hergert2, and Jürgen Kirschner1 — 1Max-Planck-Institut für Mikrostrukturphysik, D-06120 Halle, Germany — 2Fachbereich Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany
One of the most promising candidates for the construction of ultra-high-density storage media are low-dimensional magnetic nanostructures exhibiting magnetic bi- or multi-stability. This property is peculiar to magnets that have two or more stable magnetic states characterized by a relatively small energy difference between them (of the order of tens of meV) [1]. In this work we propose a novel route of locally controlling and switching magnetism in such structures: our ab initio studies give clear evidence that applying an external electric field it is possible to switch a nanostructure between its different magnetic states. We first examine a system exhibiting magnetic bi-stability, a Mn dimer on a non-magnetic Ag(001) substrate, and then generalize our statements by extending the reasoning onto the case of a multi-stable system, a Mn dimer on a magnetic Ni(001) surface. We also reveal that by applying an external electric field one can rotate the direction of atomic spins for a certain magnetic state of a nanostructure.
[1] R. Sessoli et al., Nature 365, 141 (1993); L. Thomas et al., Nature 383, 145 (1996).