Domain wall propagation in Permalloy nanowires with a thickness gradient |
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Authors: | O Petracic P Szary H Zabel D Görlitz K Nielsch |
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Institution: | 1. Institut für Experimentalphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany;2. Institute of Applied Physics and Microstructure Research Center, University of Hamburg, D-20355 Hamburg, Germany |
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Abstract: | The magnetization reversal behavior of Permalloy nanowires has been investigated using a magneto-optic Kerr effect setup. Nanowires with various widths, w=250 nm to 3 μm and a thickness of t=10 nm were fabricated by electron-beam lithography and subsequent lift-off. Furthermore, similar nanowires but with a thickness gradient along the nanowire axis have been prepared to investigate the influence of the gradient on the magnetic domain wall propagation. Magnetization hysteresis loops recorded on individual nanowires without a gradient are compared to corresponding wires with a thickness gradient. The dependence of the coercive field, Hc vs. t/w shows a linear behavior for wires without a gradient. However, wires with a gradient display a more complex crossover behavior. We find a plateau in the Hc vs. t/w curve at values of w, where a transformation from transverse to vortex domain wall type is expected. |
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Keywords: | Nanowires Domain walls Magnetization reversal Nanofabrication |
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