Investigation of scaling properties of hysteresis in Finemet thin films

TL;DR

This study investigates the scaling behavior of hysteresis loops in Finemet thin films across various thicknesses, finding no predicted scaling but a logarithmic frequency dependence in dynamic loops.

Contribution

It provides experimental insights into the scaling laws of hysteresis in Finemet films, challenging existing theoretical predictions.

Findings

No scaling observed as predicted by models

Hysteresis area shows logarithmic dependence on frequency

Behavior varies with film thickness

Abstract

We study the behavior of hysteresis loops in Finemet Fe$_{73.5}$Cu$_1$Nb$_3$Si$_{18.5}$B$_4$ thin films by using a fluxometric setup based on a couple of well compensated pickup coils. The presence of scaling laws of the hysteresis area is investigated as a function of the amplitude and frequency of the applied field, considering sample thickness from about 20 nm to 5 $\mu$m. We do not observe any scaling predicted by theoretical models, while dynamic loops show a logarithmic dependence on the frequency.