Dresden 2003 – wissenschaftliches Programm

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MA: Magnetismus

MA 13: Hauptvortr
äge Bauer / Grundler

MA 13.1: Hauptvortrag

Dienstag, 25. März 2003, 14:00–14:30, HSZ/04

Transport and switching dynamics in magnetic nanostructures — •Gerrit E.W. Bauer1, Yaroslav Tserkovnyak2, Arne Brataas3, Ke Xia4, and Paul J. Kelly51Delft University of Technology — 2Harvard University — 3Norwegian University of Science and Technology — 4Chinese Academy of Sciences — 5Twente University

Realization of a next generation of magnetic storage media requires technology based on new physical insights. Not only the size of a bit but also the necessary power to switch a magnetic bit and the switching speed are issues to be addressed by the physics community. An example of a potentially useful concept is spin-current induced magnetic switching in spin valves. In this contribution we wish to discuss our efforts to put the pioneering ideas of Berger and Slonczewski on a more quantitative footing. To be discussed are magnetoelectronic circuit theory, which gives a rather complete picture of DC magnetoelectronic properties in diffuse structures, its generalization to include the magnetization dynamics in the adiabatic limit, and quantitative materials-specific evaluation of the parameters entering the theory based on first-principles calculations. The theory explains and describes various effects such as the excess Gilbert damping in magnetic heterostructures, the angular magnetoresistance, spin torque and dynamic exchange coupling in spin valves, as well as amplification and storage functionalities of multi-terminal magnetoelectronic devices.

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