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

研究成果: 雜誌貢獻期刊論文同行評審

15 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
頁(從 - 到)2365-2373
頁數9
期刊Journal of Alloys and Compounds
695
DOIs
出版狀態已發佈 - 2017 二月 25

ASJC Scopus subject areas

  • 材料力學
  • 機械工業
  • 金屬和合金
  • 材料化學

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