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Title: Magnetic properties and spin polarization of Ru doped half metallic CrO{sub 2}

Chromium dioxide (CrO{sub 2}) is a half metal that is of interest for spintronic devices. It has not been synthesized through traditional physical vapor deposition (PVD) techniques because of its thermodynamic instability in low oxygen pressures. Epitaxial thin films of Ru doped tetragonal rutile CrO{sub 2} were synthesized by a PVD technique. The as-deposited Ru{sub x}Cr{sub 1−x}O{sub 2} was ferrimagnetic with the saturation magnetization moment showing a strong dependence on the Ru concentration. Curie temperature as high as 241 K has been obtained for ∼23 at. % Ru. The Ru substitution increased the electrical conductivity by increasing the minority spin concentration. The spin polarization was found to be as high as 70% for 9 at. % Ru and decreased to ∼60% with Ru concentrations up to ∼44 at. %, which is determined by the Fermi velocities of the majority and minority spins. First principle calculations were performed to understand the effect of Ru content on the properties of CrO{sub 2}. The PVD processes of Ru doped CrO{sub 2} could lead to the practical applications of the high spin polarization of CrO{sub 2} in spintronic devices.
Authors:
; ;  [1] ; ;  [2] ;  [1] ;  [3]
  1. Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904 (United States)
  2. Naval Research Laboratory, Washington, DC 20375 (United States)
  3. (United States)
Publication Date:
OSTI Identifier:
22483150
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABUNDANCE; CHROMIUM OXIDES; CURIE POINT; DEPOSITS; DOPED MATERIALS; ELECTRIC CONDUCTIVITY; EPITAXY; INSTABILITY; MAGNETIC PROPERTIES; MAGNETIZATION; OXYGEN; PHYSICAL VAPOR DEPOSITION; RUTILE; SPIN ORIENTATION; THIN FILMS