Detection of hydrogen by the extraordinary Hall effect in CoPd alloys

S. S. Das, G. Kopnov, A. Gerber

Research output: Contribution to journalArticlepeer-review


The effect of hydrogen adsorption on the extraordinary Hall phenomenon (EHE) in ferromagnetic CoPd films is studied as a function of composition, thickness, substrate, and hydrogen concentration in the atmosphere. Adsorption of hydrogen adds a positive term in the extraordinary Hall effect coefficient and modifies the perpendicular magnetic anisotropy with the respective changes in coercivity and remanence of hysteresis loops. Hydrogen sensitive compositions are within the Co concentration range of 20% ≤ x ≤ 50% with the strongest response near the EHE polarity reversal point x 0 ∼ 38%. Depending on the film composition and field of operation, the EHE response of CoPd to low concentration hydrogen can reach hundreds of percent, which makes the method and the material attractive for hydrogen sensing.

Original languageEnglish
Article number104502
JournalJournal of Applied Physics
Issue number10
StatePublished - 14 Sep 2018

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


Dive into the research topics of 'Detection of hydrogen by the extraordinary Hall effect in CoPd alloys'. Together they form a unique fingerprint.

Cite this