Influence of Roughness and Disorder on Tunneling Magnetoresistance

I. Marushchenko; K. Xia; M. Zwierzycki; P. J. Kelly; P. X. Xu; V.M. Karpan

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Influence of Roughness and Disorder on Tunneling Magnetoresistance

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arxiv cond-mat/0601291 v2 pith:NJA7LSGZ submitted 2006-01-13 cond-mat.mes-hall cond-mat.mtrl-sci

P. X. Xu , V.M. Karpan , K. Xia , M. Zwierzycki , I. Marushchenko , P. J. Kelly This is my paper · ORCID

classification cond-mat.mes-hallcond-mat.mtrl-sci

keywords disorderroughnesseffectfecoleadsmagnetoresistancetunnelingalloy

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abstract

A systematic, quantitative study of the effect of interface roughness and disorder on the magnetoresistance of FeCo$|$vacuum$|$FeCo magnetic tunnel junctions is presented based upon parameter-free electronic structure calculations. Surface roughness is found to have a very strong effect on the spin-polarized transport while that of disorder in the leads (leads consisting of a substitutional alloy) is weaker but still sufficient to suppress the huge tunneling magneto-resistance (TMR) predicted for ideal systems.

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