Intrinsic spin polarized electronic structure of CrO2 epitaxial film revealed by bulk-sensitive spin-resolved photoemission spectroscopy

Abstract

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 was 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.

arXiv comment7 pages, 2 figures

References in corpus (5)

• Half-metallic ferromagnets: From band structure to many-body effects
• CrO2: a self-doped double exchange ferromagnet
• Half-Metallic Ferromagnetism and the spin polarization in CrO${}_2$
• A spin- and angle-resolving photoelectron spectrometer
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Cited by in corpus (6)

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• Origins of thermal spin depolarization in half-metallic ferromagnet CrO${}_2$
• Anomalously large spin-dependent electron correlation in nearly half-metallic ferromagnet CoS${}_2$
• Biaxial-stress driven tetragonal symmetry breaking in and high-temperature ferromagnetic semiconductor from half-metallic CrO2
• Observation of Intrinsic Half-metallic Behavior of CrO${}_2$ (100) Epitaxial Films by Bulk-sensitive Spin-resolved PES
• Biaxial-stress-driven full spin polarization in ferromagnetic hexagonal chromium telluride