Hydrogenation effect on uniaxial magnetic anisotropy of a CoxPd1−x alloy microstructure

Venkata Ramana Mudinepalli, Yu Chuan Chen, Po Chun Chang, Chuan Che Hsu, Chan Yi Tsai, Hsiang Chih Chiu, Chun Te Wu, Hung Wei Yen, Shao Ju Shih, Wen Chin Lin

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10 Citations (Scopus)

Abstract

In this study, CoxPd1−x alloy thin films and microstructures were grown through an e-beam heated co-evaporation method on Al2 O3(0001) substrates. The Fourier transformation analysis of high-resolution transmission electron microscopy images revealed a structural transition from a partial crystalline structure in the bottom layer region to a well-ordered crystalline structure in the top layer region. Increasing the Pd content in the CoxPd1−x thin films shifted the magnetic anisotropy toward the perpendicular direction. Correspondingly, magnetic force microscopy revealed submicrometer-scale magnetic domain structures for CoxPd1−x thin films, where x = 37%–50%. By combining oblique deposition and a grid mask, this study fabricated a 1-dimensional (1-D) microstructured Co50 Pd50 thin film that exhibited uniaxial magnetic anisotropy (UMA). Hydrogenation exerted a more sensitive effect on the magnetic properties of this structured thin film than it did on those of a continuous thin film. After hydrogen absorption, the magnetic coercivity was enhanced by approximately 50% and squareness by more than 100%. The reversibility of the hydrogenation effect on the UMA was also demonstrated. These observations suggest that the 1-D microstructured Co[sbnd]Pd film is sensitive and suitable for applications related to sensing hydrogen gas.

Original languageEnglish
Pages (from-to)2365-2373
Number of pages9
JournalJournal of Alloys and Compounds
Volume695
DOIs
Publication statusPublished - 2017 Feb 25

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Keywords

  • Hydrogenation
  • Magnetic anisotropy
  • Magnetic thin film
  • Microstructure

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Mudinepalli, V. R., Chen, Y. C., Chang, P. C., Hsu, C. C., Tsai, C. Y., Chiu, H. C., Wu, C. T., Yen, H. W., Shih, S. J., & Lin, W. C. (2017). Hydrogenation effect on uniaxial magnetic anisotropy of a CoxPd1−x alloy microstructure. Journal of Alloys and Compounds, 695, 2365-2373. https://doi.org/10.1016/j.jallcom.2016.11.120