Author： Ben Hamida A. Rousseau O. Petit-Watelot S. Viret M.
Publisher： Edp Sciences
E-ISSN： 1286-4854|94|2|27002-27002
ISSN： 0295-5075
Source： EPL (EUROPHYSICS LETTERS), Vol.94, Iss.2, 2011-04, pp. : 27002-27002
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Abstract
The magnetoresistance of a domain wall (DWR) is measured in Permalloy constrictions down to a few atoms in size. We find a negative DWR for nanometer-sized constrictions, becoming positive in the atomic-contact regime. We conclude that the contribution from the anisotropic magnetoresistance (AMR) is gradually weakened as size decreases and spin-polarized transport across an atomically narrow constriction dominates the magnetoresistance. This is revealed by a positive contribution to the DWR reaching four percent for the smallest constrictions, which depends significantly on the specifics of the atomic arrangement.
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