Dissipationless Anomalous Hall Current in $Fe_{100-x}(SiO_2)_x$ Films

TL;DR

This study demonstrates the presence of a dissipationless anomalous Hall current in Fe-based granular films, supporting the intrinsic origin of the anomalous Hall effect through experimental measurements across varying compositions and temperatures.

Contribution

It provides experimental evidence of dissipationless anomalous Hall current in Fe-based films, highlighting the intrinsic nature of the effect.

Findings

Normalized anomalous Hall conductivity remains constant across samples.

Anomalous Hall resistivity increases significantly with SiO2 content.

Dissipationless anomalous Hall current confirmed in Fe films.

Abstract

The observation of dissipationless anomalous Hall current is one of the experimental evidences to confirm the intrinsic origin of anomalous Hall effect. To study the origin of anomalous Hall effect in iron, Fe$_{100-x}$(SiO$_{2}$)$_{x}$ granular films with volume fraction of SiO$_{2}$ 0\le x \le 40.51 were fabricated using co-sputtering. Hall and longitudinal resistivities were measured in the temperature range 5 to 350 K with magnetic fields up to 5 Tesla. As x increased from 0 to 40.51, the anomalous Hall resistivity and longitudinal resistivity increased about 4 and 3 orders in magnitude, respectively. Analysis of the results revealed that the normalized anomalous Hall conductivity is a constant for all the samples, the evidence of dissipationless anomalous Hall current in Fe.