“Universality” of finite size effects in cumn and agmn spin-glasses

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Recent measurements of the quasi-static spin-freezing temperature, T f, of thin Cu 1-xMn x layers (x = 0.04, 0.07, 0.14) in magnetron sputtered multilayer samples (MS) of CuMn alternated with Cu or Si revealed two different apparently “universal” curves for the ratio T f T f b is the bulk freezing temperature for a given x) for CuMn Cu and CuMn Si MS. We show that cooling the substrates leaves the CuMn Cu MS data unchanged, but moves the n Si MS data closer to the “universal” curve for the CuMn Cu MS show also that T f T f D for AgMn Ag MS agrees with the CuMn Cu MS “Universal” curve.