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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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