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Giant magnetoresistance in heterogeneous Cu–Co and Ag–Co alloy films (invited)

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11 Author(s)
Berkowitz, A.E. ; Department of Physics, University of California at San Diego, La Jolla, California 92093Center for Magnetic Recording Research, University of California at San Diego, La Jolla, California 92093 ; Mitchell, J.R. ; Carey, M.J. ; Young, A.P.
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Giant magnetoresistance in sputtered single films of Cu–Co and Ag–Co heterogeneous alloys is discussed. The films consist of Co‐rich precipitates in a nonferromagnetic matrix. The Ag–Co films have higher Δρ/ρ and Δρ values than the Cu–Co films, possibly due to less Co dissolved in the Ag matrix. Δρ scales inversely with precipitate particle size, implying that Co‐rich clusters ≤20 Å diameter may be most effective for spin dependent scattering. This trend of the data and a phenomenological model suggest that interfacial spin dependent scattering is significantly stronger than the scattering within the Co‐rich particles.

Published in:

Journal of Applied Physics  (Volume:73 ,  Issue: 10 )

Date of Publication:

May 1993

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