Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Magnetization Dynamics I

MA 10.5: Vortrag

Montag, 14. März 2011, 15:45–16:00, HSZ 403

Indirect control of antiferromagnetic domain walls with spin current — •Robert Wieser, Elena Y. Vedmedenko, and Roland Wiesendanger — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstrasse 11, D-20355 Hamburg, Germany

Current induced domain wall motion is an important aspect in magnetism due to its potential applications in magnetic memory and logic devices. The motion of domain walls directly influenced by spin currents associated with a spin transfer torque has been studied experimentally and theoretically. However, the investigations of current driven antiferromagnetic domain walls is very limited. In this talk we propose two promising directions for experiments on the indirect control of an antiferromagnetic (AFM) domain wall. The antiferromagnetic domain wall can be shifted both by a spin-polarized tunnel current of a scanning tunneling microscope or by a current driven ferromagnetic domain wall in an exchange coupled antiferromagnetic/ferromagnetic layer system. While the manipulation using an SP-STM tip is restricted to the atomic length scale, the controlled interaction between domain walls is important for the development of new solid state devices. Furthermore, the results contribute to an improved understanding of the exchange bias effect and provide new insight into the domain wall dynamics of filled nanotubes.