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Effect of asymmetric leads on critical switching current in magnetic nanopillars

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4 Author(s)
Kurt, H. ; Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 ; AlHajDarwish, M. ; Pratt, W.P. ; Bass, J.

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Manschot etal [Appl. Phys. Lett. 85, 3250 (2004)] predicted that the critical current to switch the magnetizations in a ferromagnetic/nonmagnetic/ferromagnetic nanopillar from parallel to antiparallel could be reduced by up to a factor of 5 by pairing nonmagnetic leads with different effective resistances (resistivity times spin diffusion length). Comparing switching currents for Co/Cu/Co nanopillars with Pt and AgSn(5%) leads on alternate sides of the nanopillar did not give the large reduction predicted by Manschot etal Possible reasons for this lack are discussed.

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Applied Physics Letters  (Volume:89 ,  Issue: 8 )