Promoting exchange bias coupling in Fe/MgO(0 0 1) films by controlling interface oxide distribution

Bo Yao Wang, Chia Ju Chen, Kai Lin, Chun Yao Hsu, Jing Yu Ning, Ming Shian Tsai, Tzu Hung Chuang, Der Hsin Wei, Shih Chang Weng

Research output: Contribution to journalArticle

Abstract

MgO-based magnetic heterostructures are crucial building blocks in state-of-the-art spintronic devices. In this study, we performed thermal annealing to control the formation and distribution of FeO across the interface of a Fe-MgO system. The exchange bias phenomenon (i.e., a horizontal shift of magnetic hysteresis loops) was extended from involving only interface spins to involving the full-volume magnetization of the Fe film. The extended and reinforced exchange bias coupling in the annealed Fe/MgO(0 0 1) films can be attributed to the formation of a Fe-FeO matrix-like structure at the Fe/MgO interface under an increasing degree of interface roughness and the reduction or diffusion of oxygen from the interfacial oxides, as indicated by X-ray absorption near edge structures and X-ray reflectivity measurements. Moreover, the thermal stability of exchange bias coupling in the annealed Fe/MgO(0 0 1) films (maximum value at approximately 600 K) was considerably higher than that in conventional thin-film-based Fe/FeO structures (approximately 50 K).

Original languageEnglish
Article number147501
JournalApplied Surface Science
Volume533
DOIs
Publication statusPublished - 2020 Dec 15

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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    Wang, B. Y., Chen, C. J., Lin, K., Hsu, C. Y., Ning, J. Y., Tsai, M. S., Chuang, T. H., Wei, D. H., & Weng, S. C. (2020). Promoting exchange bias coupling in Fe/MgO(0 0 1) films by controlling interface oxide distribution. Applied Surface Science, 533, [147501]. https://doi.org/10.1016/j.apsusc.2020.147501