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 1eV with a clear Fermi edge, consistent with the bulk-sensitive PES spectrum for CrO2. In spin-resolved spectra at 40K, 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 0.5eV below EF were observed in the spin down (minority spin) state. At 300K, 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.
| Original language | English |
|---|---|
| Article number | 202404 |
| Journal | Applied Physics Letters |
| Volume | 106 |
| Issue number | 20 |
| DOIs | |
| Publication status | Published - May 18 2015 |
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ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
Cite this
Intrinsic spin polarized electronic structure of CrO2 epitaxial film revealed by bulk-sensitive spin-resolved photoemission spectroscopy. / Fujiwara, Hirokazu; Sunagawa, Masanori; Terashima, Kensei; Kittaka, Tomoko; Wakita, Takanori; Muraoka, Yuji; Yokoya, Takayoshi.
In: Applied Physics Letters, Vol. 106, No. 20, 202404, 18.05.2015.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Intrinsic spin polarized electronic structure of CrO2 epitaxial film revealed by bulk-sensitive spin-resolved photoemission spectroscopy
AU - Fujiwara, Hirokazu
AU - Sunagawa, Masanori
AU - Terashima, Kensei
AU - Kittaka, Tomoko
AU - Wakita, Takanori
AU - Muraoka, Yuji
AU - Yokoya, Takayoshi
PY - 2015/5/18
Y1 - 2015/5/18
N2 - 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 1eV with a clear Fermi edge, consistent with the bulk-sensitive PES spectrum for CrO2. In spin-resolved spectra at 40K, 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 0.5eV below EF were observed in the spin down (minority spin) state. At 300K, 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.
AB - 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 1eV with a clear Fermi edge, consistent with the bulk-sensitive PES spectrum for CrO2. In spin-resolved spectra at 40K, 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 0.5eV below EF were observed in the spin down (minority spin) state. At 300K, 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.
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U2 - 10.1063/1.4921629
DO - 10.1063/1.4921629
M3 - Article
AN - SCOPUS:84930226455
VL - 106
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 20
M1 - 202404
ER -