Abstract
We present measurements of the spin-freezing temperature as a function of film thickness in single-layer thin films of Cu_Mn and Cu_MnAu. The noise measurements are used to characterize the temperature of the spin freezing in Cu_Mn and the cooperativity of the spin dynamics. As expected, the thicker films show cooperative spin dynamics near the spin-glass temperature. The measured spin-glass freezing temperatures as a function of film thickness are consistent with three-dimensional finite-size scaling. This article demonstrates that measurements of the resistance noise are a convenient alternative to magnetic measurements when studying dimensional effects in spin glasses.
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