Multilayer bispinel composites, in which one member is magnetite, Fe3 O4, and the other is X Fe2 O4 (X=Mg,Mn,Ni,Co) are modeled using first-principles density-functional theory in a periodic supercell scheme. Effects of transition metal composition on charge distribution and magnetization are examined in detail in order to determine the range of variability attainable upon cation substitution and distribution. Magnetic measurement on bilayer Fe3 O4 / MgFe2 O4 and Fe3 O4 / CoFe2 O4 compositions are reported, showing a considerable increase in magnetization relative to the separate bulk compounds, in qualitative agreement with theory.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - May 24 2010|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics