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

doi:10.1063/1.1632024

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

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

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 language	English
Pages (from-to)	4803-4805
Number of pages	3
Journal	Applied Physics Letters
Volume	83
Issue number	23
DOIs	https://doi.org/10.1063/1.1632024
Publication status	Published - 2003 Dec 8

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.1632024

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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.",

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AU - Hong, Jongill

AU - Lee, Youngjun

AU - Lee, Min Kyu

AU - Song, Ha Jin

AU - Shin, Hyun Joon

AU - Yoo, Yonggoo

AU - Suh, Jeongdae

PY - 2003/12/8

Y1 - 2003/12/8

N2 - 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.

AB - 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.

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