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Direct observation of high spin polarization in Co2FeAl thin films

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Author(s)

  • Xiaoqian Zhang
  • Huanfeng Xu
  • Bolin Lai
  • Qiangsheng Lu
  • Xianyang Lu
  • Yequan Chen
  • Wei Niu
  • Chenyi Gu
  • Wenqing Liu
  • Xuefeng Wang
  • Chang Liu
  • Yuefeng Nie
  • Liang He
  • Yongbing Xu

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Publication details

JournalScientific Reports
DateAccepted/In press - 3 Apr 2018
DateE-pub ahead of print (current) - 23 May 2018
Issue number1
Volume8
Number of pages6
Pages (from-to)1-6
Early online date23/05/18
Original languageEnglish

Abstract

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 by in-situ magneto-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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© The Author(s) 2018

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