Direct observation of high spin polarization in Co(2)FeAl thin films.

Direct observation of high spin polarization in Co(2)FeAl thin films.
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直接观察 Co2FeAl 薄膜中的高自旋极化

DOI:
10.1038/s41598-018-26285-9
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发表时间:
2018-05-23
期刊:
影响因子:
4.6
通讯作者:
Xu Y
Xu Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Zhang X;Xu H;Lai B;Lu Q;Lu X;Chen Y;Niu W;Gu C;Liu W;Wang X;Liu C;Nie Y;He L;Xu Y

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研究了用分子束外延技术在GaAs(001)衬底上外延生长的不同厚度的Co_2FeAl薄膜。在300 K下,利用磁光克尔效应(MOKE)和自旋分辨角分辨光电子能谱(spin-ARPES)研究了薄膜的磁性和自旋极化.在厚度为21个晶胞(uc)的薄膜中,首次观察到了58%(±7%)的高自旋极化。然而,当厚度减小到2.5 μ c时,自旋极化福尔斯仅下降到29%(±2%)。这种变化也伴随着在4 uc的磁转变,其特征在于由MOKE强度。在此之上,膜的磁化强度达到1000 emu/cm 3的体值。我们的研究结果设置了一个下限的Co2 FeAl薄膜的厚度,这具有高自旋极化和大的磁化。
We have studied the Co2FeAl thin films with different thicknesses epitaxially grown on GaAs (001) by molecular beam epitaxy. The magnetic properties and spin polarization of the films were investigated byin-situmagneto-optic Kerr effect (MOKE) measurement and spin-resolved angle-resolved photoemission spectroscopy (spin-ARPES) at 300 K, respectively. High spin polarization of 58% (±7%) was observed for the film with thickness of 21 unit cells (uc), for the first time. However, when the thickness decreases to 2.5 uc, the spin polarization falls to 29% (±2%) only. This change is also accompanied by a magnetic transition at 4 uc characterized by the MOKE intensity. Above it, the film’s magnetization reaches the bulk value of 1000 emu/cm3. Our findings set a lower limit on the thickness of Co2FeAl films, which possesses both high spin polarization and large magnetization.
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