Intrinsic spin polarized electronic structure of CrO2 epitaxial film revealed by bulk-sensitive spin-resolved photoemission spectroscopy
Intrinsic spin polarized electronic structure of CrO2 epitaxial film revealed by bulk-sensitive spin-resolved photoemission spectroscopy
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DOI：
10.1063/1.4921629
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发表时间：
2015-05-18
影响因子：
4
通讯作者：
Yokoya, Takayoshi
中科院分区：
文献类型：
--
作者：
Fujiwara, Hirokazu;Sunagawa, Masanori;Yokoya, Takayoshi
我们进行了体敏自旋分辨光电子能谱，以澄清本征自旋分辨电子态的半金属铁磁体CrO2。我们在TiO 2（100）上使用CrO 2外延膜，其显示出在1 eV处具有清晰费米边缘的峰，与CrO 2的体敏感PES光谱一致。在40 K下的自旋分辨光谱中，虽然在自旋向上（多数自旋）状态下观察到费米边缘，但在自旋向下（少数自旋）状态下没有观察到费米能级（EF）处的能隙低于EF 0.5 eV的状态。在300 K时，自旋下降状态下的差距闭合。这些结果是一致的电阻率测量和磁滞曲线的制造CrO2薄膜，构成光谱证据的CrO2在低温下的半金属性，并减少在室温下的自旋极化。我们还讨论了Cr 3d的电子相关效应。(C)2015 AIP Publishing LLC.
We have performed bulk-sensitive spin-resolved photoemission spectroscopy in order to clarify the intrinsic spin-resolved electronic states of half-metallic ferromagnet CrO2. We used CrO2 epitaxial films on TiO2(100), which shows a peak at 1 eV with a clear Fermi edge, consistent with the bulk-sensitive PES spectrum for CrO2. In spin-resolved spectra at 40 K, while the Fermi edge was observed in the spin up (majority spin) state, no states at the Fermi level (EF) with an energy gap of 0.5 eV below EF were observed in the spin down (minority spin) state. At 300 K, the gap in the spin down state closes. These results are consistent with resistivity measurements and magnetic hysteresis curves of the fabricated CrO2 film, constituting spectroscopic evidence for the half-metallicity of CrO2 at low temperature and reducing the spin polarization at room temperature. We also discuss the electron correlation effects of Cr 3d. (C) 2015 AIP Publishing LLC.