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      Phys. Rev. B 62, 3917?3922 (2000)


      [Issue 6 ? 1 August 2000 ]

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      Magnetic irreversibilities of Co/Cu/Co structures with strong
      antiferromagnetic exchange coupling

    N. Persat
    IPCMS-GEMM, CNRS-UMR 7505, ULP-ECPM, 23 rue du Loess,
    F-67037 Strasbourg, France
    Siemens AG, ZT MF 1, Paul Gossen Strasse 100, D-91052 Erlangen, Germany

    H. A. M. van den Berg
    Siemens AG, ZT MF 1, Paul Gossen Strasse 100, D-91052 Erlangen, Germany

    A. Dinia
    IPCMS-GEMM, CNRS-UMR 7505, ULP-ECPM, 23 rue du Loess,
    F-67037 Strasbourg, France

Received 6 August 1999; revised 21 March 2000

The irreversibilities in antiferromagnetically coupled Co/Cu/Co
sandwiches prepared by dc-magnetron sputtering are shown to strongly
depend on the magnetic history of the samples. The irreversibilities,
evidenced by the analysis of the giant magnetoresistance and
magnetization response along minor loops, are attributed to domain-phase
transformations. A method is given for estimating the amount of
remanence in the Co/Cu/Co sandwich, based on the analysis of the giant
magnetoresistive response. The perfect antiferromagnetic alignment at
zero field is attributed to the formation of a magnetic state with
relative large domains. The small amount of remanence detected in some
samples is ascribed to the persistence at zero field of a significant
density of domain walls.  

©2000 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v62/p3917
DOI: 10.1103/PhysRevB.62.3917
PACS: 75.60.Ch, 75.60.Ej, 75.70.Kw, 75.70.Pa

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