Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 33: Poster II

MA 33.62: Poster

Freitag, 26. März 2010, 11:00–14:00, Poster B1

Current-induced domain-wall depinning in substractive argon-sputtered permalloy nanowires — •Sedat Dogan, Gesche Nahrwold, Lars Bocklage, Toru Matsuyama, Ulrich Merkt, and Guido Meier — Institut für Angewandte Physik, Jungiusstr. 11, 20355 Hamburg

The realization of magnetic race-track memory [1] requires a good understanding of domain-wall dynamics. Domain-wall motion in permalloy nanowires can be achieved by current induced spin-transfer torque [2]. We detect depinning of a domain wall in a curved permalloy by the anisotropic magnetoresistance. One important aim is to lower the depinning fields and to get reliable depinning behavior of the domain walls. This can be achieved by an improved quality of the ferromagnet by sputtering permalloy onto heated substrates [3]. Another important aspect is the reduction of the edge roughness of the permalloy nanowires, which play an important role in the depinning process. Different fabrication techniques like lift-off processing, substractive argon plasma-sputtering and wet-etching are used to prepare wires. They are contacted by coplanar waveguides and measured in a high-frequency setup. Results of the differently prepared samples are compared in terms of depinning fields and depinning efficiency. [1] S. S. P. Parkin et al., Science 320, 190 (2008), [2] J. C. Slonczewski et al., J. Magn. Magn. Mat. 159 (1996), [3] G. Nahrwold et al., J. Appl. Phys. 105 , 07D511 (2009)