Abstract
We tried to fabricate pure Co0.9Fe0.1 ferromagnetic metal nano-contacts in the insulator layer of AlOx. First, we verified the effect of natural oxidation (N.O.) and in-situ annealing process, and we clarified the formation mechanism of Co0.9Fe0.1-AlOx NOL. In N.O. process, Al is migrated from Co0.9Fe0.1/Al mixing layer (as deposition state) and cohered on the surface by oxygen. As the result, Co0.9Fe0.1 path is pure. By in-situ annealing, Al near the surface migrate to the Co0.9Fe0.1/Al mixing surface by residual oxygen in the ultrahigh vacuum chamber, and the other Al diffuse to Co0.9Fe0.1 at the same time. Next, we observed the surface of Co0.9Fe0.1-AlOx NOL by in-situ conductive AFM (c-AFM). We confirmed the metal paths in an area with a diameter of about 1 nm.
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