Does the Dutta-Horn fluctuator model describe 1/f noise in metal films? · revision history

Revision 2

Accepted · core change · record

Changes against revision 1:

Title
Does the Dutta-Horn fluctuator model describe 1/f noise in metal films?
Plain
One standard explanation says 1/f noise comes from many defects that hop over energy barriers of different heights. It predicts a fixed link between how the noise spectrum bends and how the noise changes with temperature, and whether real metal films obey it quantitatively is not settled.
Precise · changed · core
Revision 1: In the Dutta-Horn model $S(f, T)$ is a superposition of Lorentzians from thermally activated fluctuators with rates $\left(1/\tau_0\right) \exp(-E/T)$ and a smooth activation-energy distribution $D(E)$; it predicts $\alpha(f, T) = 1 - (d \ln S/d \ln T - 1)/\ln(2 \pi f \tau_0)$, where $\alpha = -d \ln S/d \ln f$. For thin metal films (for example Au, Cu, Ag, Bi) over $f \sim 1e-3 \text{ to } 1e3\,\mathrm{Hz}$ and $T \sim 10 \text{ to } 500\,\mathrm{K}$, determine whether this relation holds with a single $\tau_0$, and whether $D(E)$ inferred from the noise matches $D(E)$ obtained independently (from internal friction or defect spectroscopy).
Revision 2: In the Dutta-Horn model $S(f, T)$ is a superposition of Lorentzians from thermally activated fluctuators with rates $\left(1/\tau_0\right) \exp(-E/T)$ and a smooth activation-energy distribution $D(E)$; it predicts $\alpha(f, T) = 1 - (d \ln S/d \ln T - 1)/\ln(2 \pi f \tau_0)$, where $\alpha = -d \ln S/d \ln f$. For thin metal films (for example Au, Cu, Ag, Bi) over $f \sim 10^{-3} \text{ to } 10^{3}\,\mathrm{Hz}$ and $T \sim 10 \text{ to } 500\,\mathrm{K}$, determine whether this relation holds with a single $\tau_0$, and whether $D(E)$ inferred from the noise matches $D(E)$ obtained independently (from internal friction or defect spectroscopy).
Settled by
Noise spectra over at least six decades of $f$ at many temperatures on one film, with the fluctuator energy distribution measured independently, testing the predicted relation with $\tau_0$ as the only parameter.
Kind
well-posed
Answer type
yes-no
References
(empty)
Literature status
open
Status note
(empty)
Posed since
1979

Decisions