Observation of Intrinsic Half-metallic Behavior of CrO${}_2$ (100) Epitaxial Films by Bulk-sensitive Spin-resolved PES

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.

8 pages, 3 figures, VUVX 2016

References in corpus (3)

• Half-metallic ferromagnets: From band structure to many-body effects
• Non-quasiparticle states in Co${}_2$MnSi evidenced through magnetic tunnel junction spectroscopy measurements
• Intrinsic spin polarized electronic structure of CrO2 epitaxial film revealed by bulk-sensitive spin-resolved photoemission spectroscopy

Cited by in corpus (5)

• Half-metallic Ferromagnets, Spin Gapless Semiconductors, and Topological Semimetals Based on Heusler Alloys
• Origins of thermal spin depolarization in half-metallic ferromagnet CrO${}_2$
• Non-local correlation effects due to virtual spin-flip processes in itinerant electron ferromagnets
• Anomalously large spin-dependent electron correlation in nearly half-metallic ferromagnet CoS${}_2$
• Peculiarities of electronic transport and magnetic state in half-metallic ferromagnetic and spin gapless semiconducting Heusler alloys