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MA: Fachverband Magnetismus

MA 49: Spin-dependent Transport/ Spin Torque

MA 49.9: Talk

Thursday, March 17, 2011, 12:45–13:00, HSZ 04

Domain Wall Manipulation With a Magnetic Tip — •Thim Stapelfeldt, Robert Wieser, Elena Y. Vedmedenko, and Roland Wiesendanger — Institute of Applied Physics and Microstructure Advanced Research Center, University of Hamburg

A theoretical concept of local manipulation of magnetic domain walls is introduced. In the proposed procedure a domain wall is moved by a magnetic tip, as used in a scanning tunneling microscope, placed above a magnetic nanostripe and than moved along it’s long axis with a current flowing through the vacuum barrier. The angular momentum from the spin polarized current exerts a torque on the magnetic moments underneath the tip and leads to a displacement of the domain wall, when the tip approaches the wall. Particularly, the manipulation of a ferromagnetic 180^∘ transverse domain wall has been studied by means of Landau-Lifshitz-Gilbert dynamics and Monte-Carlo simulations. Several operation modes corresponding to different relative orientations of the tip and the sample magnetization have been considered. The position dependent magnetic conductivity G corresponding to experimentally derived I/U curves have been obtained for each geometry.