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Fabrication Process for Nanopillars

We have developed a structuring process involving optical and e-beam lithography to fabricate nanopillar structures from epitaxially grown multilayers with pillar diameters down to 70 nm. The nanopillars are connected by relatively thick top and bottom electrodes in order to apply the high current densities, which are required for the observation of spin-transfer torque effects. The process has been successfully tested with epitaxial Fe/Ag/FeFe(001) and Fe/Ag/Fe/Cr/Fe(001) structures for which we measured current-induced hysteretic switching of the magnetic layers as well as microwave signals in the frequency range between 3 and 10 GHzH.

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H. Dassow, R. Lehndoff, D. E. Bürgler, M. Buchmeier, P. A. Grünberg, C. M. Schneider, and A. van der Hart
Normal and inverse current-induced magnetization switching in a single nanopillar
Appl. Phys. Lett. 89, 222511, (2006).


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