Sensitivity of ferromagnetic resonance in PdCo alloyed films to hydrogen gas

TL;DR

This study investigates how ferromagnetic resonance in PdCo alloy films varies with hydrogen gas exposure, revealing potential for sensitive hydrogen detection across a broad concentration range.

Contribution

It demonstrates the hydrogen sensitivity of CoPd alloy films and identifies specific compositions suitable for broad-range and ultra-low concentration sensing.

Findings

CoPd alloy films show significant FMR response changes with hydrogen exposure.

Certain compositions (x=0.39, 0.24) are promising for hydrogen sensing applications.

The Co(24)Pd(76) film detects ultra-low hydrogen concentrations from 10 to 10,000 ppm.

Abstract

In this work we studied the ferromagnetic resonance response of Co(x)Pd(1-x) alloy samples with different cobalt contents (x = 0.65, 0.39, 0.24 & 0.14). We found significant differences in the response of the samples to the presence of hydrogen gas in the samples' environment. Two particular films (with x=0.39 and 0.24) demonstrated behaviour which is promising for application in hydrogen gas sensing. Using the Co(39)Pd(61) alloy thin film, we were able to measure hydrogen gas concentration in a very broad range (from <0.1% to 100%) at a fixed value of the external magnetic field. Finally, we demonstrate that the Co(24)Pd(76) alloy thin film is sensitive to ultra-low hydrogen gas concentrations - from 10 to 10000 ppm.