TY - JOUR
T1 - Quantitative analysis of reflection electron energy loss spectra to determine electronic and optical properties of Fe–Ni alloy thin films
AU - Tahir, Dahlang
AU - Oh, Suhk Kun
AU - Kang, Hee Jae
AU - Tougaard, Sven Mosbæk
PY - 2016/1/1
Y1 - 2016/1/1
N2 - Electronic and optical properties of Fe-Ni alloy thin films grown on Si (1 0 0) by ion beam sputter deposition were studied via quantitative analyses of reflection electron energy loss spectra (REELS). The analysis was carried out by using the QUASES-XS-REELS and QUEELS-ε(k,ω)-REELS softwares to determine the energy loss function (ELF) and the dielectric functions and optical properties by analyzing the experimental spectra. For Ni, the ELF shows peaks around 3.6, 7.5, 11.7, 20.5, 27.5, 67 and 78 eV. The peak positions of the ELF for Fe
28Ni
72 are similar to those of Fe
51Ni
49, even though there is a small peak shift from 18.5 eV for Fe
51Ni
49 to 18.7 eV for Fe
28Ni
72. A plot of n, k, ε
1, and ε
2 shows that the QUEELS-ε(k,ω)-REELS software for analysis of REELS spectra is useful for the study of optical properties of transition metal alloys. For Fe-Ni alloy with high Ni concentration (Fe
28Ni
72), ε
1, and ε
2 have strong similarities with those of Fe. This indicates that the presence of Fe in the Fe-Ni alloy thin films has a strong effect.
AB - Electronic and optical properties of Fe-Ni alloy thin films grown on Si (1 0 0) by ion beam sputter deposition were studied via quantitative analyses of reflection electron energy loss spectra (REELS). The analysis was carried out by using the QUASES-XS-REELS and QUEELS-ε(k,ω)-REELS softwares to determine the energy loss function (ELF) and the dielectric functions and optical properties by analyzing the experimental spectra. For Ni, the ELF shows peaks around 3.6, 7.5, 11.7, 20.5, 27.5, 67 and 78 eV. The peak positions of the ELF for Fe
28Ni
72 are similar to those of Fe
51Ni
49, even though there is a small peak shift from 18.5 eV for Fe
51Ni
49 to 18.7 eV for Fe
28Ni
72. A plot of n, k, ε
1, and ε
2 shows that the QUEELS-ε(k,ω)-REELS software for analysis of REELS spectra is useful for the study of optical properties of transition metal alloys. For Fe-Ni alloy with high Ni concentration (Fe
28Ni
72), ε
1, and ε
2 have strong similarities with those of Fe. This indicates that the presence of Fe in the Fe-Ni alloy thin films has a strong effect.
KW - ELF
KW - Electronic properties
KW - Fe-Ni
KW - Optical properties
KW - REELS
U2 - 10.1016/j.elspec.2015.11.005
DO - 10.1016/j.elspec.2015.11.005
M3 - Journal article
SN - 0368-2048
VL - 206
SP - 6
EP - 11
JO - Journal of Electron Spectroscopy and Related Phenomena
JF - Journal of Electron Spectroscopy and Related Phenomena
ER -