Experimental and first-principles study on the magnetic and transport properties of Ti-doped Fe{sub 3}O{sub 4} epitaxial films

Journal Article · Sat Oct 15 00:00:00 EDT 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3650252· OSTI ID:22036755

Jin, C; Mi, W B; Li, P; Bai, H L ^[1]

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1. Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University, Tianjin 300072 (China)

Structure, magnetic, and transport properties of the epitaxial Fe{sub 3-x}Ti{sub x}O{sub 4} films with x{<=} 0.09 fabricated by reactive co-sputtering were investigated systematically. The lattice constant expands from 0.8360 to 0.8376 nm with x increases from 0 to 0.09. The room-temperature saturation magnetization increases by 31.7%, and the negative magnetoresistance (at 100 K) increases from 3.7% to 6.9% as x increases from 0 to 0.09. The results indicate that Ti atoms might exist at the tetrahedral sites in the spinel structure. Theoretical calculations based on the density-functional theory suggest that the doped Ti on the tetrahedral sites indeed enhances the lattice constant and magnetic moment. Meanwhile, the calculated results also imply that the Ti-doped Fe{sub 3}O{sub 4} has a high spin polarization near 100%.

• OSTI ID: 22036755
• Journal Information: Journal of Applied Physics, Vol. 110, Issue 8; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
CONCENTRATION RATIO
DENSITY FUNCTIONAL METHOD
DEPOSITION
DOPED MATERIALS
EPITAXY
FILMS
IRON OXIDES
LATTICE PARAMETERS
LAYERS
MAGNETIC MOMENTS
MAGNETIZATION
MAGNETORESISTANCE
SPIN
SPIN ORIENTATION
SPINELS
TEMPERATURE RANGE 0273-0400 K
TITANIUM OXIDES