Research Article

Distribution of Oxygen at the Ni81Fe19/Ta Interface

Table 1

XAFS analysis results using WinXas program [11]. XANES: weight percent contribution from oxide (Fe2O3 or NiO) and metal (Py) phases to the measured spectra of the Fe and Ni edge. EXAFS: the Debye–Waller factors (σ2) are given ×10−3 Å2.

SampleFe2O3 (wt.%)Py (wt.%)NiO (wt.%)Py (wt.%)Disorder Fe-edge σ2 (10−3 Å2)Disorder Ni-edge σ2 (10−3 Å2)

PyTa11.22 ± 0.4388.78 ± 0.472.82 ± 0.0497.18 ± 0.048.32 ± 0.0985.28 ± 0.078
PyTaO228.51 ± 0.0571.49 ± 0.061.18 ± 0.0498.82 ± 0.425.40 ± 0.0175.16 ± 0.015
PyO2Ta20.29 ± 0.5279.71 ± 0.571.68 ± 0.0498.32 ± 0.044.60 ± 0.0193.66 ± 0.070
PyO250.24 ± 0.3049.76 ± 0.326.13 ± 0.0493.87 ± 0.044.28 ± 0.0203.31 ± 0.017