Studies on the magnetism of cobalt ferrite nanocrystals synthesized by hydrothermal method

Effect of Ho3+substitution on the cation distribution, crystal structure and magnetocrystalline anisotropy of nanocrystalline cobalt ferrite

“…For undoped sample (x ¼ 0.0), the spectra show two prominent absorption bands with peaks at 502 ( 1 ) and 435 ( 2 ) cm À1 . The band positions are found to be in agreement with the characteristic infrared absorption bands of cobalt ferrite nanocrystals [42]. The band 1 is assigned to the vibration of the bond between the oxygen ion and the tetrahedral metal ion (O-M Tet ) and the band 2 is assigned to the vibration of the bond between the oxygen ion and the octahedral metal ion (O-M Oct ) [43].…”

Applications of exchange coupled bi-magnetic hard/soft and soft/hard magnetic core/shell nanoparticles

“…When analyzing the magnetic properties observed experimentally for diverse hard-soft core/shell nanoparticles a spread of different behaviors can be found [91][92][93][94][95][98][99][100][102][103][104]106,107,110,111,114,115,[121][122][123][125][126][127][128][129][130][131][132]136,140,141,143,175,. First, it should be pointed out that given that we are dealing with nanoparticles the core and shell sizes are rather small (i.e., usually smaller than 2 H ), thus, most of the systems exhibit smooth hysteresis loops typical of strongly exchange coupled hard-soft counterparts.…”

Magnetic, electric and thermal properties of cobalt ferrite nanoparticles

“…This water loss lasts until 270-300°C. A second weight loss, which varies, depending on the samples, between 5% and 10%, is associated to a high exothermic peak, and corresponds to the decarbonation of the nanopowders [35][36]. The decarbonation occurs between 300°C and 420°C, but for x=0.6, it lasts even until 500°C (Fig.4a).…”