Zero-bias anomaly in CrO ₂ junctions

Finite-temperature spin polarization in half-metallic ferromagnets

“…25 respectively. This suggests a loss of net spin polarization, 10 although Coulomb-blockade contributions 26 have not been eliminated from these experiments.…”

Oxidation of metals at the chromium oxide interface

“…5,18,20 From the outset, i.e., from the initial stages of surface preparation, the core-level binding energies indicated that the stable surfaces were Cr 2 O 3 . X-ray photoemission ͑XPS͒ measurements were obtained using the Mg K␣ line radiation ͑1253.6 eV͒.…”

“…Photoemission final state effects, similar to surface photovoltage effects, have been extensively characterized and eliminated. 5 Valence-band spectra were obtained using He II (h ϭ40.8 eV), at room temperature as well, and the photoelectrons were collected normal to the surface.…”

“…For a clean Cr 2 O 3 /CrO 2 surface ͑zero monolayers Co coverage͒, the spectrum is the typical Cr 2 O 3 /CrO 2 valence-band spectrum. 5,18 With increasing Co coverage, the bands at 4 to 8 eV from Cr-O 2p hybridization bands, and the band at 2 eV binding energy dominated by the Cr 3d orbitals, are suppressed while a strong feature at about 1 eV becomes very prominent and the density of states at Fermi energy is increasingly well established. At Co coverages above 15 ML, the overlapping Co 3d bands around 1 eV binding energy are dominant and show the sharp Fermi edge characteristic of a metal.…”

Characterization of the native Cr2O3 oxide surface of CrO2

“…One class of films were fabricated by laser initiated organometallic chemical vapor deposition ͑OMCVD͒, 17 while the other type of films were made by rf sputtering of CrO 3 onto LaAlO 3 substrates and annealing in a high-pressure cell. 18 Annealing in about 100 atm of oxygen pressure at 390°C leads to a stable CrO 2 phase.…”