Growth mechanism and magnetism of CoFe2O4 thin films; Role of the substrate

On stoichiometry and intermixing at the spinel/perovskite interface in CoFe2O4/BaTiO3 thin films

“…It is noted that such an ilmenite structure is a confirmed multiferroic material [30] that shows significant promise for strong coupling of the electric and magnetic moments. In this case, however, the introduction of such an interfacial layer effectively inhibits the elastic interaction of the separate magnetoelectric components and thus reduces the magnetic moment of the spinel thin film, as previously published [1].…”

“…The impact of the growth of the film on the highly polar BaTiO 3 substrate is demonstrated well in Figure 1(a) where contrast variations due to strain effects are extended over 100 nm into the substrate. The film is epitaxially grown (also revealed by XRD [1]) and it proceeds with a columnar character. The strain induced by the 7% lattice mismatch is com- pensated by minor rotations of unit cells and dislocations.…”

“…The interfacial regions that are commonly found in oxide composites, are often formed from defects, strain, and interdiffusion; sometimes they can be of a completely different crystal structure or chemical composition. When the film thickness goes below about one hundred nanometers, it is very likely that up to about half of the film volume is structurally affected by the interface [1], which significantly changes its overall properties. In some cases, the new chemistry can be advantageous, like for the SrTiO 3 -LaAlO 3 interface, which the interfacial bonding energies create a highly conductive 2D electron cloud.…”

A Novel Ternary CoFe2O4/CuO/CoFe2O4 as a Giant Magnetoresistance Sensor

“…The diffraction peaks that appear in Figure 3 (Figure 1) differed from the CoFe 2 O 4 in the trilayer (Figure 3), which occurs because of differences in the structure and morphology of the material substrate. Axelsson, et al [22] have shown that the structure and magnetic properties of thin-layer CoFe 2 O 4 are influenced by the type of substrate material.…”

Resonance Raman spectroscopy of NdAlO3 single-crystal fibers grown by the laser-heated pedestal growth technique

“…Usually, these oxides present low Neel temperatures (about 4 K) [3], high melting points (higher than 2400 K) [4], excellent crystal quality [5], and stability under chemical attack [6], making them appropriate and desired to applications as substrates for the epitaxial growth of thin films. Indeed, several works reported the features of thin films grown on, mainly, LaAlO 3 and NdAlO 3 substrates [7,8]. In all cases, there is a role of these substrates in the strain-induced properties.…”