Hydrogenation-induced strengthening of exchange bias coupling in antiferromagnetic Pd-rich alloy films

Bo Yao Wang, Chun Wei Shih, Ming Shian Tsai, Chia Ju Chen, Kai Lin, Jin Jhuan Li, Chun Wei Huang, Wen Chin Lin, Shih Chang Weng

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Abstract

Hydrogenation has recently been proposed for use in modulating the magnetic properties of Pd-rich ferromagnetic (FM) alloy films. This study successfully fabricated Pd-rich Mn/MnPd/Fe antiferromagnetic/FM films with an established exchange bias field at RT, and determined that hydrogenation can enhance the exchange bias coupling in such films. Specifically, magnetic hysteresis loops revealed that the magnetic state of the Pd-rich Mn/MnPd/Fe films was gradually changed from an unbiased state to an exchange-biased state upon exposure to a hydrogen environment; moreover, hydrogenation engendered a larger magnitude of the exchange bias field than conventional field cooling. This phenomenon can be attributed to the enhanced long-range antiferromagnetic ordering of the Pd-rich MnPd film upon uptake of hydrogen atoms.

Original languageEnglish
Pages (from-to)223-229
Number of pages7
JournalJournal of Alloys and Compounds
Volume748
DOIs
Publication statusPublished - 2018 Jun 5

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All Science Journal Classification (ASJC) codes

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

Cite this

Wang, B. Y., Shih, C. W., Tsai, M. S., Chen, C. J., Lin, K., Li, J. J., Huang, C. W., Lin, W. C., & Weng, S. C. (2018). Hydrogenation-induced strengthening of exchange bias coupling in antiferromagnetic Pd-rich alloy films. Journal of Alloys and Compounds, 748, 223-229. https://doi.org/10.1016/j.jallcom.2018.03.121