Spin- and time-resolved photoemission studies of thin Co2FeSi Heusler alloy films

Spin- and time-resolved photoemission studies of thin Co2FeSi Heusler alloy films
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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
M. Aeschlimann
中科院分区:
材料科学3区
文献类型:
--
作者:
J.-P. Wüstenberg;M. Cinchetti;M. Sánchez Albaneda;M. Bauer;M. Aeschlimann

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本文用自旋和时间分辨光电子能谱研究了可能是半金属态的Co_2Fe_Si全Heusler合金。对于激发,使用飞秒钛:蓝宝石激光器的第二和第四谐波,光子能量分别为3.1和5.9eV。我们比较了所测得的表面自旋极化(SSP)对特定的光电发射机制,即单光子光电发射(1 PPE)或双光子光电发射(2 PPE)的依赖性。在自旋极化中观察到的差异可以解释由自旋相关的寿命效应发生在2-光子吸收过程。在这种情况下,两种方法的逸出深度差异表明,观察到的自旋极化降低(与体相比较)不能仅归因于最外表面层,而是发生在距离表面至少4- 6 nm处。
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.
通过时间和自旋分辨光发射研究自旋相关电子动力学
DOI: --
发表时间: 1998
期刊:
影响因子: --
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