Effect of High Magnetic Field Annealing on Magnetic Properties of CoFe$_{2}$O$_{4}$ Nanowire Arrays

Ordered mesoporous CoFe2O4 nanoparticles: molten-salt-assisted rapid nanocasting synthesis and the effects of calcining heating rate

“…6 Until now, several chemical approaches have been developed for the synthesis of CoFe 2 O 4 nanoparticles, among which the hydrothermal method, 7,8 liquid-phase co-precipitation 9 and sol-gel process 10 are those which are relatively conventional and have been well established. By utilizing the methods mentioned above, lots of novel nanostructures of CoFe 2 O 4 nanoparticles, for example, nanorings, 11 nanowires 12 and nanoplates, 13 have been obtained. However, when talking about applications of nanomaterials, possession of large specific surface areas (SSAs) is always what we expect, but CoFe 2 O 4 nanoparticles obtained via those conventional methods, regretfully, could hardly meet the expectations with poor SSAs generally lower than 70 m 2 g À1 .…”

Structure and Magnetic Property Changes of 2–2-Type BaTiO3–CoFe2O4 Composite Thin Films Induced by Magnetic Field Annealing

“…In some previous studies about magnetic annealing effect on the polycrystalline CFO ceramic and films, three factors induced by the magnetic field are thought as the main reasons for the variation of the magnetic properties of the CFO, which include the following: (a) the rotation and rearrangement of the easy axis along the sintered field direction, (b) the oriented migration and increased occupation of cobalt ions at B sites, and (c) the induced additional strains by the magnetic field [12,13,22,23]. In the BTO-CFO composite films, all the three factors should also be applicable for the CFO layers.…”

Magnetism of CoFe2O4 thin films annealed under the magnetic field

“…Magnetic annealing, applying an external magnetic field (H a ) during the heating process, has a significant impact on the microstructure, grain morphology, defects as well as magnetic properties of the final materials. A lot of studies about the magnetic annealing effect on the polycrystalline CFO have been reported [13][14][15][16]. The uniaxial behavior was observed in the magnetic hysteresis loops and magnetostrictive measurement for the low-field-annealed polycrystalline CFO ceramics, which showed a significantly enhanced magnetostriction of -273 PPM when the measuring magnetic field was applied perpendicular to the annealing field direction [15].…”