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Observation of intrinsic half-metallic behavior of CrO2 (100) epitaxial films by bulk-sensitive spin-resolved PES

Authors :
Masanori Sunagawa
Yuji Muraoka
Hirokazu Fujiwara
Kensei Terashima
Takanori Wakita
Takayoshi Yokoya
Tomoko Kittaka
Source :
Journal of Electron Spectroscopy and Related Phenomena. 220:46-49
Publication Year :
2017
Publisher :
Elsevier BV, 2017.

Abstract

We have investigated the electronic states and spin polarization of half-metallic ferromagnet CrO$_2$ (100) epitaxial films by bulk-sensitive spin-resolved photoemission spectroscopy with a focus on non-quasiparticle (NQP) states derived from electron-magnon interactions. We found that the averaged values of the spin polarization are approximately 100% and 40% at 40 K and 300 K, respectively. This is consistent with the previously reported result [H. Fujiwara et al., Appl. Phys. Lett. 106, 202404 (2015).]. At 100 K, peculiar spin depolarization was observed at the Fermi level ($E_{F}$), which is supported by theoretical calculations predicting NQP states. This suggests the possible appearance of NQP states in CrO$_2$. We also compare the temperature dependence of our spin polarizations with that of the magnetization.<br />Comment: 8 pages, 3 figures, VUVX 2016

Details

ISSN :
03682048
Volume :
220
Database :
OpenAIRE
Journal :
Journal of Electron Spectroscopy and Related Phenomena
Accession number :
edsair.doi.dedup.....4277528e27697d53b729a4770e6381ad