Spin- and time-resolved photoemission studies of thin Co2FeSi Heusler alloy films
Spin- and time-resolved photoemission studies of thin Co2FeSi Heusler alloy films
复制标题
Co2FeSi Heusler 合金薄膜的自旋和时间分辨光电子发射研究
DOI:
10.1016/j.jmmm.2007.02.164
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发表时间:
2007
影响因子:
2.7
通讯作者:
M. Aeschlimann
中科院分区:
文献类型:
--
作者:
J.-P. Wüstenberg;M. Cinchetti;M. Sánchez Albaneda;M. Bauer;M. Aeschlimann
We have studied the possibly half-metallic Co2FeSi full Heusler alloy by means of spin- and time-resolved photoemission spectroscopy. For excitation, the second and fourth harmonic of femtosecond Ti:sapphire lasers were used, with photon energies of 3.1 and 5.9eV, respectively. We compare the dependence of the measured surface spin polarization (SSP) on the particular photoemission mechanism, i.e. 1-photon photoemission (1PPE) or 2-photon photoemission (2PPE). The observed differences in the spin polarization can be explained by a spin-dependent lifetime effect occurring in the 2-photon absorption process. The difference in escape depth of the two methods in this context suggests that the observed reduction of spin polarization (compared to the bulk) cannot be attributed just to the outermost surface layer but takes place at least 4–6nm away from the surface.
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DOI:
--
发表时间:
1998
期刊:
影响因子:
--
作者:
M. Aeschlimann;R. Burgermeister;S. Pawlik;M. Bauer;D. Oberli;W. Weber
通讯作者:
W. Weber
影响因子:
3.7
作者:
H. Kolev;G. Rangelov;J. Braun;M. Donath
通讯作者:
M. Donath
影响因子:
3.7
作者:
Wang, WH;Przybylski, M;Kirschner, J
通讯作者:
Kirschner, J
影响因子:
3.7
作者:
Schneider, H.;Jakob, G.;Adrian, H.
通讯作者:
Adrian, H.