The Effect of Sr-CoFeO Nanoparticles with Different Particles Sized as Additives in CIP-Based Magnetorheological Fluid.

This study investigated the effect of adding strontium (Sr)-doped cobalt ferrite (CoFeO) nanoparticles in carbonyl iron particle (CIP)-based magnetorheological fluids (MRFs). Sr-CoFeO nanoparticles were fabricated at different particle sizes using co-precipitation at calcination temperatures of 300 and 400 °C. Field emission scanning electron microscopy (FESEM) was used to evaluate the morphology of the Sr-CoFeO nanoparticles, which were found to be spherical.

Revisiting the Structural, Electronic, and Magnetic Properties of (LaO)MnAs: Effect of Hubbard Correction and Origin of Mott-Insulating Behavior.

We study the structural, electronic, and magnetic properties of the antiferromagnetic-layered oxyarsenide (LaO)MnAs system from the first-principle calculation. The increasing Hubbard energy () in the Mn 3d orbital induces the increasing local-symmetry distortions (LSDs) in MnAs and OLa tetrahedra. The LSD in MnAs tetrahedra is possibly promoted by the second-order Jahn-Teller effect in the Mn 3d orbital.