Microstructure, magnetic and electronic transport properties of polycrystalline γ′-Fe4N films

摘要: Abstract The single-phase γ′ -Fe 4 N films were fabricated using reactive sputtering. x-ray diffraction peaks from N(111), (200) and (311) indicate that the are N. grain size increases with increase of film thickness ( t ), grains grow a columnar structure. All soft ferromagnetic at room temperature. saturation magnetization decreases increasing temperature, satisfies modified Bloch's spin wave theory. electrical transport properties show metallic conductance mechanism, room-temperature resistivity , revealing electron scattering decrease . magnetoresistance (MR) evolves positive to negative transition temperature MR 5 K complex should be dominated by Lorentz force effect, suppression scattering, shift minority majority bands under magnetic field.