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      Phys. Rev. B 48, 16156?16159 (1993)


      [Issue 21 ? 1 December 1993 ]

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      Fluctuation-dissipation relation for giant magnetoresistive 1//f/
      noise

    H. T. Hardner, M. B. Weissman, and M. B. Salamon
    /Department of Physics, University of Illinois at Urbana-Champaign,
    Urbana, Illinois 61801-3080/

    S. S. P. Parkin
    /IBM Almaden Research Center, 650 Harry Road, San Jose, California
    95120-6099/

Received 7 September 1993

We find that Co/Cu multilayers exhibiting giant magnetoresistance (GMR)
also show giant magnetoresistive 1//f/ noise. The largest component of
this noise (which peaks at magnetic fields maximizing the GMR
derivative) is accurately predicted from a fluctuation-dissipation
relation using the out-of-phase GMR in an ac field. A second noise
mechanism, connected with defects in the antiferromagnetic order but not
related to overall magnetization fluctuations, was found near zero field.

©1993 The American Physical Society

*URL:* http://link.aps.org/abstract/PRB/v48/p16156
*DOI:* 10.1103/PhysRevB.48.16156
*PACS:* 73.50.Jt, 75.70.Fr, 75.60.Ej, 72.70.+m

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