Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)

MA 18.58: Poster

Dienstag, 26. Februar 2008, 15:15–18:30, Poster E

Investigation of permalloy nanowire-based NOT gates in the microwave regime using crossed coplanar waveguides — •Andres Conca, Patricia Martin Pimentel, Britta Leven, and Burkard Hillebrands — FB Physik + FSP MINAS, TU Kaiserslautern, Erwin Schrödinger-Str. 56, 67633 Kaiserslautern, Germany

Serious obstacles must be confronted in order to reduce the dimensions and power consumption of Si-based logic devices. In this context, alternative possibilities exploiting the magnetic properties of materials have triggered a large research effort.

Recently, Allwood et al. [1] proved logic operations by domain wall motion at low frequencies (27 Hz) in structures consisting of nanometric permalloy wires under a rotating static magnetic field.

In collaboration with the Imperial College London, similar gates are patterned with focused ion beam on top of a crossed coplanar waveguides (cpw’s) scheme previously developed by P. Martín Pimentel [2]. Microwave currents phase-shifted by π/2 are sent through two cpw’s in order to achieve a rotating microwave field. Main aim of this research is the investigation of the behavior of the NOT gates at larger frequencies (20MHz-1GHz) in order to find the maximal operating speed of the devices. For this purpose, a time-resolved Kerr microscope is used. Here, results concerning the magnetic response of the NOT gates in the mentioned frequency range are shown and discussed.

Support by MAGLOG (IST-FET-510993) is acknowledged.

[1]D. A. Allwood et al, J. Appl. Physics, 95, 8264 (2004).

[2]P. Martín Pimentel et al, Appl. Phys. Lett., 88, 122510 (2006).