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O: Fachverband Oberflächenphysik

O 91: [MA] Poster II

O 91.56: Poster

Friday, March 30, 2012, 11:00–14:00, Poster A

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

A theoretical concept of local manipulation of magnetic domain walls is introduced. In the proposed procedure, a domain wall is driven by a spin-polarized current induced by a magnetic tip, as used in a scanning tunneling microscope, placed above a magnetic nanostripe and then moved along its 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. Particularly, the manipulation of a ferromagnetic 180° transverse domain wall has been studied by means of Monte Carlo simulations. The coercivity created by defects as well as tailord pinning centers is presented as a function of the change of the exchange constant and the pinning center size, respectively.