Chemical states of Co and Fe in a specularly reflective oxide layer in spin valves

Jongill Hong, Youngjun Lee, Min Kyu Lee, Ha Jin Song, Hyun Joon Shin, Yonggoo Yoo, Jeongdae Suh

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Abstract

The near-edge x-ray absorption fine structure (NEXAFS) spectroscopy was used to analyze the chemical states of cobalt (Co) and iron (Fe) in the specularly reflective ultrathin oxide layer in spin valves. The magnetoresistance responses show that oxygen reacted with the solute Fe rather than with the solvent Co. The Fe oxide transformed into α-Fe 2O3, leading to an increase in the magnetoresistance values. The results show that the magnetoresistance performance and the magnetic properties of the spin valves were improved by obtaining and controlling the appropriate oxide phases.

Original languageEnglish
Pages (from-to)4803-4805
Number of pages3
JournalApplied Physics Letters
Volume83
Issue number23
DOIs
Publication statusPublished - 2003 Dec 8

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Hong, J., Lee, Y., Lee, M. K., Song, H. J., Shin, H. J., Yoo, Y., & Suh, J. (2003). Chemical states of Co and Fe in a specularly reflective oxide layer in spin valves. Applied Physics Letters, 83(23), 4803-4805. https://doi.org/10.1063/1.1632024