Regensburg 2007 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 24: Spindynamics / Switching II

MA 24.9: Vortrag

Donnerstag, 29. März 2007, 12:15–12:30, H23

Spin transfer induced magnetization dynamics using the Ag/Fe(100) interface — •Ronald Lehndorff, Daniel E. Bürgler, and Claus M. Schneider — Institut für Festkörperforschung and cni - Center of Nanoelectronic Systems for Information Technology, Forschungszentrum Jülich GmbH, D-52425 Jülich

Spin-polarized currents in magnetic nanostructures induce magnetization dynamics, which differ strongly from magnetic field induced dynamics [1, 2]. The Ag/Fe(100) interface has been predicted to have a strong spin dependence of the interface resistance and should therefore be a good spin polarizer [3] and give strong spin transfer effects. We study spin transfer induced magnetization dynamics in single-crystalline, layered systems grown by molecular beam epitaxy. The layer sequence is 2 nm Fe/ 6 nm Ag/ 20 nm Fe. The topmost layer is structured by e-beam lithography and ion beam etching into a circle of 65 to 85 nm in diameter. To characterize the structures we measure the current-perpendicular-plane giant magnetoresistance. Current induced switching and current driven high-frequency excitations of the free layer are recorded under different angles of the magnetic field with respect to the crystal axes of the Fe(100) layers.

[1] J.C. Slonczewski, J. Magn. Magn. Mater. 159, L1 (1996)

[2] L. Berger, Phys. Rev. B 54, 9353 (1996)

[3] D. Stiles, A. Zangwill, Phys. Rev. B 66, 014407 (2002)