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APS » Journals » Phys. Rev. B » Volume 48 » Issue 21
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Phys. Rev. B 48, 16156–16159 (1993)

Fluctuation-dissipation relation for giant magnetoresistive 1/f noise

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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; published in the issue dated 1 December 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/doi/10.1103/PhysRevB.48.16156
DOI:
10.1103/PhysRevB.48.16156
PACS:
73.50.Jt, 75.70.Fr, 75.60.Ej, 72.70.+m
 
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